The Carnegie Supernova Project: First Near-Infrared Hubble Diagram to z~0.7 (2009)
Freedman, Wendy L., Burns, Christopher R., Phillips, M. M., Wyatt, Pamela, Persson, S. E., Madore, Barry F., ...
The Carnegie Supernova Project (CSP) is designed to measure the luminosity distance for Type Ia supernovae (SNe Ia) as a function of redshift, and to set observational constraints on the dark energy...
The He-rich core-collapse supernova 2007Y: observations from x-ray to radio wavelengths (2009)
Stritzinger, Maximilian, Mazzali, P., Phillips, Mark M., Immler, Stefan, Soderberg, Alicia, Sollerman, Jesper, ...
A detailed study spanning approximately a year has been conducted on the Type Ib supernova (SN) 2007Y. Imaging was obtained from X-ray to radio wavelengths, and a comprehensive set of multi-band...
Concerning the Slope of the Cepheid Period-Luminosity Relation (2009)
Madore, Barry F., Freedman, Wendy L.
We discuss the impact of possible differences in the slope of the Cepheid Period-Luminosity relation on the determination of extragalactic distances in the context of recent studies that suggest...
The He-rich core-collapse supernova 2007Y: Observations from X-ray to Radio Wavelengths (2009)
Stritzinger, Maximilian, Mazzali, Paolo, Phillips, Mark M., Immler, Stefan, Soderberg, Alicia, Sollerman, Jesper, ...
A detailed study spanning approximately a year has been conducted on the Type Ib supernova 2007Y. Imaging was obtained from X-ray to radio wavelengths, and a comprehensive set of multi-band...
Madore, Barry F., Freedman, Wendy L., Catanzarite, J., Navarrete, Mauricio
We report VRI CCD observations of nine Cepheids in the South Polar (Sculptor) Group spiral galaxy NGC 0247. Periods of these Cepheids range from 20 to 70 days. Over the past 20 years the very...
Freedman, Wendy L., Rigby, Jane, Madore, Barry F., Persson, S. E., Sturch, Laura, Mager, Violet
We present mid-infrared Period-Luminosity relations for Cepheids in the Local Group galaxy IC1613. Using archival IRAC imaging data from Spitzer we were able to measure single-epoch magnitudes for...
The He-rich core-collapse supernova 2007Y: observations from X-ray to radio wavelengths (2009)
Stritzinger, Maximilian, Mazzali, Paolo, Phillips, Mark M., Immler, Stefan, Soderberg, Alicia, Sollerman, Jesper, ...
REPORT OF THE DARK ENERGY TASK FORCE (2008)
Andreas Albrecht, Wendy L. Freedman, Carnegie Observatories, John Huth, John C. Mather, Goddard Space
Dark energy appears to be the dominant component of the physical Universe, yet there is no persuasive theoretical explanation for its existence or magnitude. The acceleration of the Universe is,...
Madore, Barry F., Rigby, Jane, Freedman, Wendy L., Persson, S. E., Sturch, Laura, Mager, Violet
We present the first application of mid-infrared Period-Luminosity relations to the determination of a Cepheid distance beyond the Magellanic Clouds. Using archival IRAC imaging data on NGC 6822 from...
The Cepheid Period-Luminosity Relation at Mid-Infrared Wavelengths: II. Second-Epoch LMC Data (2008)
Madore, Barry F., Freedman, Wendy L., Rigby, Jane, Persson, S. E., Sturch, Laura, Major, Violet
We present revised and improved mid-infrared Period-Luminosity (PL) relations for Large Magellanic Cloud (LMC) Cepheids based on double-epoch data of 70 Cepheids observed by Spitzer at 3.6, 4.5, 5.8...
Sharpening the Tip of the Red Giant Branch (2008)
Madore, Barry F., Mager, Violet, Freedman, Wendy L.
We introduce a modified detection method for measuring the luminosity of the tip of the red giant branch (TRGB) by introducing the composite magnitude T = I - beta [(V-I)_o - 1.50], where beta is the...
Metallicity-corrected Tip of the Red Giant Branch Distance to NGC 4258 (2008)
Mager, Violet A., Madore, Barry F., Freedman, Wendy L.
We have determined the distance to NGC 4258 using observations made with the Hubble Space Telescope (HST) and the Wide Field, Advanced Camera for Surveys (ACS/WFC). We apply a modified technique that...
A New Distance to The Antennae Galaxies (NGC 4038/39) Based on the Type Ia Supernova 2007sr (2008)
Schweizer, Francois, Burns, Christopher R., Madore, Barry F., Mager, Violet A., Phillips, M. M., Freedman, Wendy L., ...
Traditionally, the distance to NGC 4038/39 has been derived from the systemic recession velocity, yielding about 20 Mpc for H_0 = 72 km/s/Mpc. Recently, this widely adopted distance has been...
Companions to Isolated Elliptical Galaxies: Revisiting the Bothun-Sullivan Sample (2008)
Madore, Barry F., Freedman, Wendy L., Bothun, Gregory D.
(Abridged) We investigate the number of physical companion galaxies for a sample of relatively isolated elliptical galaxies. NED has been used to reinvestigate the incidence of satellite galaxies for...
The Cepheid Period-Luminosity Relation at Mid-Infrared Wavelengths: I. First-Epoch LMC Data (2008)
Freedman, Wendy L., Madore, Barry F., Rigby, Jane, Persson, S. E., Sturch, Laura
We present the first mid-infrared Period-Luminosity (PL) relations for Large Magellanic Cloud (LMC) Cepheids. Single-epoch observations of 70 Cepheids were extracted from Spitzer IRAC observations at...
DISTANCE TO THE FORNAX CLUSTER USING THE HUBBLE SPACE TELESCOPE: IMPLICATIONS FOR COSMOLOGY (2007)
Wendy L. Freedman, N. Silbermann, Paul Ha Rding, Jeremy R. Mould, ...
ABSTRACT Using the Hubble Space Telescope (HST), we have discovered Cepheid variables in the Fornax cluster spiral galaxy, NGC 1365. V and I period-luminosity relations for 37 Cepheids with periods...
Anne Turner, Laura Ferrarese, Peter Il. Stetson, John A. Grahan, Ilarry Maclore, N. A. Silbernlann, ...
Received! accepted.—
The Tip Of The Red Giant Branch As A Precision Distance Indicator: Ii. Computer Simulations (2007)
Barry Madore Processing, Barry F. Madore, Wendy L. Freedman
this paper, the limits of this technique have explored quantified computer simulation. Four effects were photometric errors, crowding, population size and contamination. From the simulations draw...
Space Telescope Freedman, W. L. Freedman, S. M. Hughes, B. F. Madore, J. R. Mould, M. G. Lee, ...
We report on the discovery of 30 new Cepheids in the nearby galaxy M81 based on observations using the Space Telescope The periods for these lie in the range of 10 to 55 days, based on 18 independent...
Shaun M. Hughes, Barry F. Madore (2007)
And Jeremy California, Shaun M. Hughes, Barry F. Madore, Jeremy R. Mould, Laura Ferrarese, C. Ford, ...
The Distance Scale (HO) Key Project for Space Telescope ( aims employ the period-luminosity relation to measure galaxy distances out as far as the Virgo cluster. The vital steps in this program are...
Exploration And The, Robert A. Brown, Arthur F. Davidsen, Richard S. Ellis, Wendy L. Freedman, Richard F. Green, ...
this report to represent many interests, with a correspondingly large range of technical and scientific experience and expertise. We recognize this diversity by presenting first, in Parts I and II,...
The peculiar SN 2005hk: Do some type Ia supernovae explode as deflagrations? (2007)
Phillips, M. M., Li, Weidong, Frieman, Joshua A., Blinnikov, S. I., DePoy, Darren, Prieto, José L., ...
The peculiar SN 2005hk: Do some type ia supernovae explode as deflagrations? (2007)
Phillips, M. M., Li, Weidong, Frieman, Joshua A., Blinnikov, S. I., DePoy, Darren, Prietro, Jose L., ...
Publicación ISI
The peculiar SN 2005hk: Do some type ia supernovae explode as deflagrations? (2007)
Phillips, M. M., Li, Weidong, Frieman, Joshua A., Blinnikov, S. I., DePoy, Darren, Prietro, Jose L., ...
Publicación ISI
Benedict, G. Fritz, McArthur, Barbara E., Feast, Michael W., Barnes, Thomas G., Harrison, Thomas E., Patterson, Richard J., ...
(abridged) We present new absolute trigonometric parallaxes and relative proper motions for nine Galactic Cepheid variable stars: l Car, zeta Gem, beta Dor, W Sgr, X Sgr, Y Sgr, FF Aql, T Vul, and RT...
Report of the Dark Energy Task Force (2006)
Albrecht, Andreas, Bernstein, Gary, Cahn, Robert, Freedman, Wendy L., Hewitt, Jacqueline, Hu, Wayne, ...
Dark energy appears to be the dominant component of the physical Universe, yet there is no persuasive theoretical explanation for its existence or magnitude. The acceleration of the Universe is,...
The Carnegie Supernova Project: The low-redshift survey (2006)
Hamuy, Mario, Folatelli, Gastón, Morrell, Nidia I., Phillips, Mark M., Suntzeff, Nicholas B., Persson, S. E., ...
Supernovae are essential to understanding the chemical evolution of the universe. Type Ia supernovae also provide the most powerful observational tool currently available for studying the expansion...
Optical and near-infrared observations of the peculiar Type la supernova 1999ac (2006)
Phillips, Mark M., Krisciunas, Kevin, Suntzeff, Nicholas B., Abraham, R. G., Beckett, M. G., Bonati, Marco, ...
We present 39 nights of optical photometry, 34 nights of IR photometry, and 4 nights of optical spectroscopy of the Type la supernova 1999ac. This supernova was discovered 2 weeks before maximum...
Optical and near-infrared observations of the peculiar Type la supernova 1999ac (2006)
Phillips, Mark M., Krisciunas, Kevin, Suntzeff, Nicholas B., Abraham, R. G., Beckett, M. G., Bonati, Marco, ...
We present 39 nights of optical photometry, 34 nights of IR photometry, and 4 nights of optical spectroscopy of the Type la supernova 1999ac. This supernova was discovered 2 weeks before maximum...
The Carnegie Supernova Project: The Low-Redshift Survey (2005)
Hamuy, Mario, Folatelli, Gastón, Morrell, Nidia I., Phillips, Mark M., Suntzeff, Nicholas B., Persson, S. E., ...
Supernovae are essential to understanding the chemical evolution of the Universe. Type Ia supernovae also provide the most powerful observational tool currently available for studying the expansion...
The Carnegie Supernova Project (2004)
The Carnegie Supernova Project (CSP) is aimed at providing an independent measure of change in the the Hubble expansion as a function of redshift, and setting constraints dark energy contribution to...
Hill, Robert J., Freedman, Wendy L., Madore, Barry F., Bernstein, Rebecca A.
Based on newly acquired UBVRI CCD photometry, we present a deep color-magnitude diagram for the Galactic open cluster NGC 129, which contains the 8.00 day period Cephid DL CAS.
Limits on Hubble Constant from the Distance of M100 (2004)
Mould, Jeremy, Huchra, John P., Bresolin, Fabio, Ferrarese, Laura, Ford, Holland C., Freedman, Wendy L., ...
We examine the consequences of a 17 Mpc M100 distance, questioning its consistency with supernova and other distances.
The HST Key Project on the Extragalactic Distance Scale VI. The Cepheids in NGC925 (2004)
Silbermann, N. A., Harding, Paul, Madore, Barry F., Kennicutt, Robert C. Jr., Saha, Abhijit, Stetson, Peter, ...
We report the detection of Cepheid Variable stars in the barred spiral galaxy NGC925, using the Hubble Space Telescope (HST) Wide Field and Planetary Camera 2 (WFPC2). Twelve V (F555W), four I...
Sakai, Shoko, Madore, Barry F., Freedman, Wendy L., Lauer, Tod R., Ajhar, Edward A., Baum, William A.
We report the unambiguous detection of individually resolved stars in the elliptical galaxy NGC 3379, a luminous member of the Leo I Group.
Sakai, Shoko, Madore, Barry F., Freedman, Wendy L., Lauer, Tod
We report the unambiguous detection of individually resolved stars in the elliptical galaxy NGC 3379, a luminous member of the Leo I Group.
Hipparcos Parallaxes and the Cepheid Distance Scale (2004)
Madore, Barry F., Freedman, Wendy L.
Hipparcos parallaxes have recently become available for a sample of Galactic Cepheids. We have used these new distances to calibrate the Cepheid period-luminosity (PL) relation at six wavelengths...
BVRIJK light curves and radial velocity curves for selected Magellanic Cloud Cepheids (2004)
Storm, Jesper, Carney, Bruce W., Gieren, Wolfgang P., Fouque, Pascal, Freedman, Wendy L., Madore, Barry F., ...
We present high precision and well sampled BVRIJK light curves and radial velocity curves for a sample of five Cepheids in the SMC. In addition we present radial velocity curves for three Cepheids in...
Measuring and Understanding the Universe (2003)
Freedman, Wendy L., Turner, Michael S.
Revolutionary advances in both theory and technology have launched cosmology into its most exciting period of discovery yet. Unanticipated components of the universe have been identified, promising...
Mendez, Bryan, Davis, Marc, Moustakas, John, Newman, Jeffrey, Madore, Barry F., Freedman, Wendy L.
The properties of the velocity field in the local volume (cz < 550 km/s) have been difficult to constrain due to a lack of a consistent set of galaxy distances. The sparse observations available to...
The Measure of Cosmological Parameters (2002)
New, large, ground and space telescopes are contributing to an exciting and rapid period of growth in observational cosmology. The subject is now far from its earlier days of being data-starved and...
The Cepheid period-luminosity relation in the Large Magellanic Cloud (2002)
Sebo, Kim M., Rawson, Daya, Mould, Jeremy R., Madore, Barry F., Putman, Mary E., Graham, John A., ...
A homogeneous set of ground-based BVRI observations of ~600 Cepheids is presented to check the Cepheid period-luminosity zero point for the Large Magellanic Cloud (LMC). The sample of Cepheids is...
The Cepheid period-luminosity relation in the Large Magellanic Cloud (2002)
Sebo, Kim M., Rawson, Daya, Mould, Jeremy R., Madore, Barry F., Putman, Mary E., Graham, John A., ...
A homogeneous set of ground-based BVRI observations of ~600 Cepheids is presented to check the Cepheid period-luminosity zero point for the Large Magellanic Cloud (LMC). The sample of Cepheids is...
The Cepheid period-luminosity relation in the Large Magellanic Cloud (2002)
Sebo, Kim M., Rawson, Daya, Mould, Jeremy R., Madore, Barry F., Putman, Mary E., Graham, John A., ...
A homogeneous set of ground-based BVRI observations of ~600 Cepheids is presented to check the Cepheid period-luminosity zero point for the Large Magellanic Cloud (LMC). The sample of Cepheids is...
The Cepheid period-luminosity relation in the Large Magellanic Cloud (2002)
Sebo, Kim M., Rawson, Daya, Mould, Jeremy R., Madore, Barry F., Putman, Mary E., Graham, John A., ...
A homogeneous set of ground-based BVRI observations of ~600 Cepheids is presented to check the Cepheid period-luminosity zero point for the Large Magellanic Cloud (LMC). The sample of Cepheids is...
The Cepheid period-luminosity relation in the Large Magellanic Cloud (2002)
Sebo, Kim M., Rawson, Daya, Mould, Jeremy R., Madore, Barry F., Putman, Mary E., Graham, John A., ...
A homogeneous set of ground-based BVRI observations of ~600 Cepheids is presented to check the Cepheid period-luminosity zero point for the Large Magellanic Cloud (LMC). The sample of Cepheids is...
Quantitative Morphology of Galaxies Observed in the Ultraviolet (2001)
Kuchinski, L. E., Madore, Barry F., Freedman, Wendy L., Trewella, M.
We present a quantitative study of the far-ultraviolet (FUV) and optical morphology in 32 nearby galaxies and estimate the ``morphological k-correction'' expected if these objects were observed...
Krisciunas, Kevin, Phillips, Mark M., Stubbs, Christopher, Rest, Armin, Miknaitis, Gajus, Riess, Adam G., ...
We present BVRI photometry of the Type Ia supernovae 1999da, 1999dk, 1999gp, 2000bk, and 2000ce, plus infrared photometry of three of these. These objects exhibit the full range of decline rates of...
The Luminosity of SN 1999by in NGC 2841 and the Nature of `Peculiar' Type Ia Supernovae (2001)
Garnavich, Peter M., Bonanos, Alceste Z., Krisciunas, Kevin, Jha, Saurabh, Kirshner, Robert P., Schlegel, Eric M., ...
We present UBVRIJHK photometry and optical spectroscopy of the so-called 'peculiar' Type Ia supernova 1999by in NGC 2841. The observations began one week before visual maximum light which is...
Final results from the Hubble Space Telescope key project to measure the Hubble Constant (2001)
Freedman, Wendy L., Madore, Barry F., Gibson, Brad K., Ferrarese, Laura, Kelson, Daniel D., Sakai, Shoko, ...
We present here the final results of the Hubble Space Telescope (HST) Key Project to measure the Hubble constant. We summarize our method, the results, and the uncertainties, tabulate our revised...
Macri, Lucas M., Calzetti, Daniela, Freedman, Wendy L., Gibson, Brad K., Graham, John A., Huchra, John P., ...
We present the results of near-infrared observations of extragalactic Cepheids made with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST). The...
Final results from the Hubble Space Telescope key project to measure the Hubble Constant (2001)
Freedman, Wendy L., Madore, Barry F., Gibson, Brad K., Ferrarese, Laura, Kelson, Daniel D., Sakai, Shoko, ...
We present here the final results of the Hubble Space Telescope (HST) Key Project to measure the Hubble constant. We summarize our method, the results, and the uncertainties, tabulate our revised...
Macri, Lucas M., Calzetti, Daniela, Freedman, Wendy L., Gibson, Brad K., Graham, John A., Huchra, John P., ...
We present the results of near-infrared observations of extragalactic Cepheids made with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST). The...
Final results from the Hubble Space Telescope key project to measure the Hubble Constant (2001)
Freedman, Wendy L., Madore, Barry F., Gibson, Brad K., Ferrarese, Laura, Kelson, Daniel D., Sakai, Shoko, ...
We present here the final results of the Hubble Space Telescope (HST) Key Project to measure the Hubble constant. We summarize our method, the results, and the uncertainties, tabulate our revised...
Macri, Lucas M., Calzetti, Daniela, Freedman, Wendy L., Gibson, Brad K., Graham, John A., Huchra, John P., ...
We present the results of near-infrared observations of extragalactic Cepheids made with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST). The...
Final results from the Hubble Space Telescope key project to measure the Hubble Constant (2001)
Freedman, Wendy L., Madore, Barry F., Gibson, Brad K., Ferrarese, Laura, Kelson, Daniel D., Sakai, Shoko, ...
We present here the final results of the Hubble Space Telescope (HST) Key Project to measure the Hubble constant. We summarize our method, the results, and the uncertainties, tabulate our revised...
Macri, Lucas M., Calzetti, Daniela, Freedman, Wendy L., Gibson, Brad K., Graham, John A., Huchra, John P., ...
We present the results of near-infrared observations of extragalactic Cepheids made with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST). The...
Final results from the Hubble Space Telescope key project to measure the Hubble Constant (2001)
Freedman, Wendy L., Madore, Barry F., Gibson, Brad K., Ferrarese, Laura, Kelson, Daniel D., Sakai, Shoko, ...
We present here the final results of the Hubble Space Telescope (HST) Key Project to measure the Hubble constant. We summarize our method, the results, and the uncertainties, tabulate our revised...
Macri, Lucas M., Calzetti, Daniela, Freedman, Wendy L., Gibson, Brad K., Graham, John A., Huchra, John P., ...
We present the results of near-infrared observations of extragalactic Cepheids made with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST). The...
A revised Cepheid distance to NGC 4258 and a test of the distance scale (2000)
Newman, Jeffrey A., Ferrarese, Laura, Stetson, Peter B., Maoz, Eyal, Zepf, Stephen E., Davis, Marc, ...
In a previous paper (Maoz et al. 1999), we reported a Hubble Space Telescope (HST) Cepheid distance to the galaxy NGC 4258 obtained using the calibrations and methods then standard for the Key...
Ferrarese, Laura, Silbermann, N. A., Mould, Jeremy R., Stetson, Peter B., Saha, Abhijit, Freedman, Wendy L., ...
We explore the limits of photometric reductions of crowded stellar fields observed with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope. Two photometric procedures, based on...
Ferrarese, Laura, Ford, Holland C., Huchra, John, Kennicutt, Robert C., Mould, Jeremy R., ...
We present a compilation of Cepheid distance moduli and data for four secondary distance indicators that employ stars in the old stellar populations: the planetary nebula luminosity function (PNLF),...
Mould, Jeremy R, Huchra, John P, Freedman, Wendy L, Kennicutt Jr, Robert C, Ferrarese, Laura, Ford, Holland C, ...
Since the launch of the Hubble Space Telescope nine years ago, Cepheid distances to 25 galaxies have been determined for the purpose of calibrating secondary distance indicators. A variety of these...
Sakai, Shoko, Mould, Jeremy R., Hughes, Shaun M. G., Huchra, John P., Macri, Lucas M., Kennicutt, Robert C., ...
This paper presents the calibration of BVRIH$ Tully-Fisher relations based on Cepheid distances to 21 galaxies within 25 Mpc, and 23 clusters within 10,000 km/s. These relations have been applied to...
Kelson, Daniel D., Illingworth, Garth D., Tonry, John L., Freedman, Wendy L., Kennicutt, Robert C., ...
Using published photometry and spectroscopy, we construct the fundamental plane and D_n-Sigma relations in Leo I, Virgo and Fornax. The published Cepheid P-L relations to spirals in these clusters...
The Hubble Constant and the Expansion Age of the Universe (1999)
The Hubble constant, which measures the expansion rate, together with the total energy density of the Universe, sets the size of the observable Universe, its age, and its radius of curvature....
Ferrarese, Laura, Mould, Jeremy R., Kennicutt, Robert C., Huchra, John, Ford, Holland C., ...
A Cepheid-based calibration is derived for four distance indicators that utilize stars in the old stellar populations: the tip of the red giant branch (TRGB), the planetary nebula luminosity function...
Gibson, Brad K., Stetson, Peter B., Freedman, Wendy L., Mould, Jeremy R., Kennicutt, Robert C., ...
Cepheid-based distances to seven Type Ia supernovae (SNe)-host galaxies have been derived using the standard HST Key Project on the Extragalactic Distance Scale pipeline. For the first time, this...
A Cepheid distance to NGC 4258 (1999)
Maoz, Eyal, Newman, Jeffrey A., Ferrarese, Laura, Stetson, Peter B., Zepf, Stephen E., Davis, Marc, ...
Distances measured using Cepheid variable stars have been essential for establishing the cosmological distance scale and the value of the Hubble constant. These stars have remained the primary...
Prosser, Charles F., Kennicutt, Robert C., Bresolin, Fabio, Saha, Abhijit, Sakai, Shoko, ...
We report on the detection of Cepheids and the first distance measurement to the spiral galaxy NGC 1326-A, a member of the Fornax cluster of galaxies. We have employed data obtained with the Wide...
Sakai, Shoko, Ferrarese, Laura, Kennicutt, Robert C., Graham, John A., Silbermann, N. A., Mould, Jeremy R., ...
The distance to NGC 3319 has been determined from Cepheid variable stars as part of the Hubble Space Telescope Key Project on the Extragalactic Distance Scale. Thirteen and four epochs of...
Determination of Cosmological Parameters (1999)
Rapid progress has been made recently toward the measurement of cosmological parameters. Still, there are areas remaining where future progress will be relatively slow and difficult, and where...
A Cepheid Distance to NGC 4603 in Centaurus (1999)
Newman, Jeffrey A., Zepf, Stephen E., Davis, Marc, Freedman, Wendy L., Madore, Barry F., Stetson, Peter B., ...
In an attempt to use Cepheid variables to determine the distance to the Centaurus cluster, we have obtained images of NGC 4603 with the Hubble Space Telescope on 9 epochs using WFPC2 and the F555W...
Madore, Barry F., Freedman, Wendy L., Silbermann, N., Harding, Paul, Huchra, John, Mould, Jeremy, ...
Using the Hubble Space Telescope (HST) 37 long-period Cepheid variables have been discovered in the Fornax Cluster spiral galaxy NGC 1365. The resulting V and I period-luminosity relations yield a...
Gibson, Brad K., Hughes, Shaun M. G., Stetson, Peter B., Freedman, Wendy L., Kennicutt, Robert C., ...
The distance to NGC 4725 has been derived from Cepheid variables, as part of the Hubble Space Telescope Key Project on the Extragalactic Distance Scale. Thirteen F555W (V) and four F814W (I) epochs...
Cepheid and Tip of the Red Giant Branch Distances To the Dwarf Irregular Galaxy IC10 (1998)
Sakai, Shoko, Madore, Barry F., Freedman, Wendy L.
We present color-magnitude diagrams and luminosity functions of stars in the nearby galaxy IC 10, based on VI CCD photometry acquired with the COSMIC prime-focus camera on the Palomar 5m telescope....
Ferrarese, Laura, Bresolin, Fabio, Kennicutt, Robert C., Saha, Abhijit, Stetson, Peter B., ...
We report the detection of Cepheids and a new distance to the spiral galaxy NGC 2541, based on data obtained with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope (HST). A...
Han, Mingsheng, Hoessel, John, Freedman, Wendy L., Kennicutt, Robert C., Mould, Jeremy. R., ...
The distance to NGC 7331 has been derived from Cepheid variables observed with HST/WFPC2, as part of the Extragalactic Distance Scale Key Project. Multi-epoch exposures in F555W (V) and F814W (I),...
The Hubble Space Telescope Key Project to Measure the Hubble Constant (1998)
Freedman, Wendy L., Mould, Jeremy R., Kennicutt, Robert C., Madore, Barry F.
A review of the Hubble Space Telescope H0 Key Project is given, as presented at the IAU Symposium 183 on "Cosmological Parameters" held in Kyoto, Japan in August, 1997. An outline of the goals and...
Hipparcos Parallaxes and the Cepheid Distance Scale (1997)
Madore, Barry F., Freedman, Wendy L.
Hipparcos parallaxes have recently become available for a sample of Galactic Cepheids, and we have used these new distances to calibrate the Cepheid period-luminosity (PL) relation at six wavelengths...
Measuring Cosmological Parameters (1997)
In this review, the status of measurements of the matter density (Omega), the vaccuum energy density or cosmological constant (Lambda), the Hubble constant (H0), and ages of the oldest measured...
Rawson, Daya M., Macri, Lucas M., Mould, Jeremy R., Huchra, John P., Freedman, Wendy L., Kennicutt, Robert C., ...
We report on the discovery of Cepheids in the field spiral galaxy NGC 3621, based on observations made with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope (HST). NGC 3621...
Daya Rawson, Lucas M. Macri, Jeremy R. Mould, John P. Huchra, Wendy L. Freedman, Robert C. Kennicutt, ...
We report on the discovery of Cepheids in the field spiral galaxy NGC 3621, based on observations made with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope (HST). NGC 3621...
Ultraviolet Signatures of Tidal Interaction in the Giant Spiral Galaxy, M101 (1996)
Waller, William H., Bohlin, Ralph C., Cornett, Robert H., Fanelli, Michael N., Freedman, Wendy L., Hill, Jesse K., ...
We present new evidence for tidal interactions having occurred in the disk of M101 in the last 10^8 - 10^9 years. Recent imaging of the far-ultraviolet emission from M101 by the Shuttle-borne...
Determination of the Hubble Constant (1996)
Recent developments in the determination of H0 are reviewed in the context of the 3 following questions: 1) What is required to measure an accurate value of H0? Given the wide range of H0 values...
Hubble Space Telescope Observations of M32: The Color-Magnitude Diagram (1996)
Grillmair, Carl J., Lauer, Tod R., Worthey, Guy, Faber, S. M., Freedman, Wendy L., Madore, Barry F., ...
We present a V-I color-magnitude diagram for a region 1'-2' from the center of M32 based on Hubble Space Telescope WFPC2 images. The broad color-luminosity distribution of red giants shows that the...
Measuring cosmological parameters
In this review, the status of measurements of the matter density (Ωm), the vacuum energy density or cosmological constant (ΩΛ), the Hubble constant (H0), and the ages of the oldest measured...
Determination of the Hubble constant
Freedman, Wendy L., Feng, Long Long
Establishing accurate extragalactic distances has provided an immense challenge to astronomers since the 1920s. The situation has improved dramatically as better detectors have become available, and...
Measuring cosmological parameters
In this review, the status of measurements of the matter density (Ωm), the vacuum energy density or cosmological constant (ΩΛ), the Hubble constant (H0), and the ages of the oldest measured...
Determination of the Hubble constant
Freedman, Wendy L., Feng, Long Long
Establishing accurate extragalactic distances has provided an immense challenge to astronomers since the 1920s. The situation has improved dramatically as better detectors have become available, and...