Weighing dark matter haloes with gravitationally lensed supernovae (2009)
Jonsson, Jakob, Dahlen, Tomas, Hook, Isobel, Goobar, Ariel, Mortsell, Edvard
High redshift Type Ia supernovae (SNe Ia) are likely to be gravitationally lensed by dark matter haloes of galaxies in the foreground. Since SNe Ia have very small dispersion after light curve shape...
Relation between stellar mass and star-formation activity in galaxies (2009)
Mobasher, Bahram, Dahlen, Tomas, Hopkins, Andrew, Scoville, Nick Z., Capak, Peter, Rich, R. Michael, ...
For a mass-selected sample of 66544 galaxies with photometric redshifts (z phot) from the Cosmic Evolution Survey (COSMOS), we examine the evolution of star-formation activity as a function of...
Supernova acceleration probe : investigating photometric redshift optimization (2008)
Dahlen, Tomas, Mobasher, Bahram
The aim of this paper is to investigate ways to optimize the accuracy of photometric redshifts for a Supernova Acceleration Probe (SNAP)-like mission. We focus on how the accuracy of the photometric...
The Extended HST Supernova Survey: The Rate of SNe Ia at z>1.4 Remains Low (2008)
Dahlen, Tomas, Strolger, Louis-Gregory, Riess, Adam G.
We use the HST ACS imaging of the two GOODS fields during Cycles 11, 12, and 13 to derive the Type Ia supernova rate in four redshift intervals in the range 0.21.4 appears to contradict these...
Tentative detection of the gravitational magnification of type Ia supernovae (2006)
Jonsson, Jakob, Dahlen, Tomas, Goobar, Ariel, Mortsell, Edvard, Riess, Adam
The flux from distant type Ia supernovae (SN) is likely to be amplified or de-amplified by gravitational lensing due to matter distributions along the line-of-sight. A gravitationally lensed SN would...
Riess, Adam G., Strolger, Louis-Gregory, Casertano, Stefano, Ferguson, Henry C., Mobasher, Bahram, Gold, Ben, ...
We have discovered 21 new Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to trace the history of cosmic expansion over the last 10 billion years. These objects,...
Dahlen, Tomas, Mobasher, Bahram, Dickinson, Mark, Ferguson, Henry C., Giavalisco, Mauro, Kretchmer, Claudia, ...
Using the multiwavelength photometric and spectroscopic data covering the CDF-S obtained within the GOODS, we investigate the rest-frame UV properties of galaxies to z~2.2, including the evolution of...
Corrections for gravitational lensing of supernovae: better than average? (2005)
Gunnarsson, Christofer, Dahlen, Tomas, Goobar, Ariel, Jonsson, Jakob, Mortsell, Edvard
We investigate the possibility of correcting for the magnification due to gravitational lensing of standard candle sources, such as Type Ia supernovae. Our method uses the observed properties of the...
Lensing magnification of supernovae in the GOODS-fields (2005)
Jonsson, Jakob, Dahlen, Tomas, Goobar, Ariel, Gunnarsson, Christofer, Mortsell, Edvard, Lee, Kyoungsoo
Gravitational lensing of high-redshift supernovae is potentially an important source of uncertainty when deriving cosmological parameters from the measured brightness of Type Ia supernovae,...
Dahlen, Tomas, Mobasher, Bahram, Somerville, Rachel S., Moustakas, Leonidas A., Dickinson, Mark, Ferguson, Henry C., ...
Using Hubble Space Telescope and ground-based U through K- band photometry from the Great Observatories Origins Deep Survey (GOODS), we measure the evolution of the luminosity function and luminosity...
High Redshift Supernova Rates (2004)
Dahlen, Tomas, Strolger, Louis-Gregory, Riess, Adam G., Mobasher, Bahram, Chary, Ranga-Ram, Conselice, Christopher J., ...
We use a sample of 42 supernovae detected with the Advanced Camera for Surveys on-board the Hubble Space Telescope as part of the Great Observatories Origins Deep Survey to measure the rate of core...
The galaxy population of intermediate-redshift clusters (2004)
Dahlen, Tomas, Fransson, Claes, Naslund, Magnus, Ostlin, Goran
Using photometric redshifts we determine the galaxy population of the clusters of galaxies Cl0016+16 at z=0.55, Cl1600+41 at z=0.54, Cl1601+42 at z=0.54 and MS1008-1224 at z=0.31. Comparing the...
Jogee, Shardha, Barazza, Fabio D., Rix, Hans-Walter, Shlosman, Isaac, Barden, Marco, Wolf, Christian, ...
One-third of present-day spirals host optically visible strong bars that drive their dynamical evolution. However, the fundamental question of how bars evolve over cosmological times has yet to be...
Structure and Evolution of Starburst and Normal Galaxies (2003)
Mobasher, Bahram, Jogee, Shardha, Dahlen, Tomas, De Mello, Duilia, Conselice, Christopher, Grogin, Norman, ...
We study the rest-frame morphology and structural properties of optically selected starburst galaxies at redshift z < 1, using multi-waveband (BViz) high resolution images taken by the Advanced...
Somerville, Rachel S., Moustakas, Leonidas A., Mobasher, Bahram, Gardner, Jonathan P., Cimatti, Andrea, Conselice, Christopher, ...
The redshift distribution of near-IR selected galaxies is often used to attempt to discriminate between the classical view of galaxy formation, in which present-day luminous galaxies were assembled...
Observing the Formation of the Hubble Sequence in the Great Observatories Origins Deep Survey (2003)
Conselice, Christopher J., Grogin, Norman A., Jogee, Shardha, Lucas, Ray A., Dahlen, Tomas, De Mello, Duilia, ...
Understanding the physical formation of the Hubble sequence remains one of the most important unsolved astrophysical problems. Searches for proto-disks and proto-ellipticals can now be effectively...
Tidal interactions, mergers, and starburst activity from Z=0 (2003)
Jogee, Shardha, Barden, Marco, Beckwith, Steven, Bell, Eric, Borsch, Andrea, Caldwell, John, ...
Selection of high-z supernovae candidates (2002)
Deep, ground based, optical wide-field supernova searches are capable of detecting a large number of supernovae over a broad redshift range up to z~1.5. While it is practically unfeasible to obtain...
The Galaxy Population of Cl1601+42 at z=0.54 (2001)
Dahlen, Tomas, Fransson, Claes, Naeslund, Magnus
Photometric redshifts are used to determine the rest frame luminosity function (LF) of both early-type and late-type galaxies to M_B ~ -17.6 for the cluster Cl1601+42 at z = 0.54. The total LF shows...
Rates and redshift distribution of high-z supernovae (1999)
Dahlen, Tomas, Fransson, Claes
Using observed star formation rates at redshifts up to z ~ 5, we calculate cosmic supernova rates for core collapse and Type Ia supernovae. Together with supernova statistics and detailed light...
High z supernovae with the NGST (1998)
Dahlen, Tomas, Fransson, Claes
We use different assumptions for the combination of dust extinction and star formation up to redshifts z >= 5, as well as detailed modeling of supernova properties, to estimate the number of...