Improvement of the Spatial Resolution of the ACIS Using Split Pixel Events (2009)
Hiroshi Tsunemi, Christopher Baluta, David N. Burrows, Gordon P. Garmire, George Chartas
The position accuracy of X-ray photons on a CCD detector is generally believed to be limited by the CCD pixel size. While this is true in general, the position accuracy for X-ray events which deposit...
X-ray Evolution of SNR 1987A: The Radial Expansion (2009)
Racusin, Judith L., Park, Sangwook, Zhekov, Svetozar, Burrows, David N., Garmire, Gordon P., McCray, Richard
We present the evolution of the radial expansion of SNR 1987A as measured using Chandra X-ray observations taken over the last 10 years. To characterize the complex structure of the remnant and...
Stellar Clusters in the NGC 6334 Star Forming Complex (2009)
Feigelson, Eric D., Martin, Amanda L., McNeill, Collin J., Broos, Patrick S., Garmire, Gordon P.
The full stellar population of NGC 6334, one of the most spectacular regions of massive star formation in the nearby Galaxy, have not been well-sampled in past studies. We analyze here a mosaic of...
Protoplanetary Disk Evolution around the Triggered Star Forming Region Cepheus B (2009)
Getman, Konstantin V., Feigelson, Eric D., Luhman, Kevin L., Sicilia-Aguilar, Aurora, Wang, Junfeng, Garmire, Gordon P.
The Cepheus B (CepB) molecular cloud and a portion of the nearby CepOB3b OB association, one of the most active regions of star formation within 1 kpc, have been observed with the IRAC detector on...
Park, Sangwook, Kargaltsev, Oleg, Pavlov, George G., Mori, Koji, Slane, Patrick O., Hughes, John P., ...
We present results from our X-ray data analysis of the SNR G330.2+1.0 and its CCO, CXOU J160103.1--513353 (J1601). Using our XMM-Newton and Chandra observations, we find that the X-ray spectrum of...
X-ray flares in Orion young stars. I. Flare characteristics (2008)
Getman, Konstantin V., Feigelson, Eric D., Broos, Patrick S., Micela, Giuseppina, Garmire, Gordon P.
Pre-main sequence (PMS) stars are known to produce powerful X-ray flares which resemble magnetic reconnection solar flares scaled by factors up to 10^4. However, numerous puzzles are present...
X-Ray flares in Orion Young Stars. II. Flares, Magnetospheres, and Protoplanetary Disks (2008)
Getman, Konstantin V., Feigelson, Eric D., Micela, Giuseppina, Jardine, Moira M., Gregory, Scott G., Garmire, Gordon P.
We study the properties of powerful X-ray flares from 161 pre-main sequence (PMS) stars observed with the Chandra X-ray Observatory in the Orion Nebula region. Relationships between flare properties,...
Variable x-ray absorption toward the gravitationally-lensed blazar PKS 1830-211 (2008)
Dai, Xinyu, Mathur, Smita, Chartas, George, Nair, Sunita, Garmire, Gordon P.
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Variable X-ray Absorption toward Gravitationally-Lensed Blazar PKS1830-211 (2007)
Dai, Xinyu, Mathur, Smita, Chartas, George, Nair, Sunita, Garmire, Gordon P.
We present X-ray spectral analysis of five Chandra and XMM-Newton observations of the gravitationally-lensed blazar PKS1830-211 from 2000 to 2004. We show that the X-ray absorption toward PKS1830-211...
Chandra X-Ray Study of Galactic Supernova Remnant G299.2-2.9 (2007)
Park, Sangwook, Slane, Patrick O., Hughes, John P., Mori, Koji, Burrows, David N., Garmire, Gordon P.
We report on observations of the Galactic supernova remnant (SNR) G299.2$-$2.9 with the {\it Chandra X-Ray Observatory}. The high resolution images with {\it Chandra} resolve the X-ray-bright knots,...
Chandra Observations of Supernova 1987A (2007)
Park, Sangwook, Burrows, David N., Garmire, Gordon P., McCray, Richard, Racusin, Judith L., Zhekov, Svetozar A.
We have been monitoring Supernova (SN) 1987A with {\it Chandra X-Ray Observatory} since 1999. We present a review of previous results from our {\it Chandra} observations, and some preliminary results...
The young stellar population in M17 revealed by Chandra (2006)
Broos, Patrick S., Feigelson, Eric D., Townsley, Leisa K., Getman, Konstantin V., Wang, Junfeng, Garmire, Gordon P., ...
We report here results from a Chandra ACIS observation of the stellar populations in and around the Messier 17 H II region. The field reveals 886 sources, 771 of which have stellar counterparts in...
Discovery of a Candidate Central Compact Object in the Galactic Nonthermal SNR G330.2+1.0 (2006)
Park, Sangwook, Mori, Koji, Kargaltsev, Oleg, Slane, Patrick O., Hughes, John P., Burrows, David N., ...
We report on the discovery of a pointlike source (CXOU J160103.1$-$513353) at the center of a Galactic supernova remnant (SNR) G330.2+1.0 with {\it Chandra X-Ray Observatory}. The X-ray spectrum fits...
An X-ray Census of Young Stars in the Massive Southern Star-Forming Complex NGC 6357 (2006)
Wang, Junfeng, Townsley, Leisa K., Feigelson, Eric D., Getman, Konstantin V., Broos, Patrick S., Garmire, Gordon P., ...
We present the first high spatial resolution X-ray study of the massive star forming region NGC 6357, obtained in a 38 ks Chandra/ACIS observation. Inside the brightest constituent of this large HII...
Evolutionary Status of SNR 1987A at the Age of Eighteen (2006)
Park, Sangwook, Zhekov, Svetozar A., Burrows, David N., Garmire, Gordon P., Racusin, Judith L., McCray, Richard
$\sim$18 yr after the supernova explosion, the blast wave of SNR 1987A is entering the main body of the equatorial circumstellar material, which is causing a dramatic brightening of the remnant. We...
A Candidate Neutron Star Associated with Galactic Center Supernova Remnant Sagittarius A East (2005)
Park, Sangwook, Muno, Michael P., Baganoff, Frederick K., Maeda, Yoshitomo, Morris, Mark, Chartas, George, ...
We present imaging and spectral studies of the supernova remnant (SNR) Sagittarius (Sgr) A East from deep observations with the {\it Chandra X-Ray Observatory}. The spatially-resolved spectral...
Supernova Remnant 1987A: The Latest Report from the Chandra X-Ray Observatory (2005)
Park, Sangwook, Zhekov, Svetozar A., Burrows, David N., Garmire, Gordon P., McCray, Dick
We continue monitoring supernova remnant (SNR) 1987A with the {\it Chandra X-ray Observatory}. As of 2004 January, bright X-ray spots in the northwest and the southwest are now evident in addition to...
Roming, Peter W. A., Liechty, John C., Shoemaker, Jared R., Sohn, David H., Roush, William B., Burrows, David N., ...
Utilizing a ray-tracing program, we have modeled the angular resolution of a short focal length (~2m), large field-of-view (3.1 square degrees), grazing incidence mirror shell. It has been previously...
A Chandra View of The Morphological And Spectral Evolution of Supernova Remnant 1987A (2004)
Park, Sangwook, Zhekov, Svetozar A., Burrows, David N., Garmire, Gordon P., McCray, Richard
We present an update on the results of our monitoring observations of the X-ray remnant of supernova (SN) 1987A with the {\it Chandra X-Ray Observatory}. As of 2002 December, we have performed a...
A Study of QSO Evolution in the X-Ray Band with the Aid of Gravitational Lensing (2004)
Dai, Xinyu, Chartas, George, Eracleous, Michael, Garmire, Gordon P.
We present results from a mini-survey of relatively high redshift (1.7 < z < 4) gravitationally lensed radio-quiet quasars observed with the Chandra X-ray Observatory and with XMM-Newton. The lensing...
Park, Sangwook, Hughes, John P., Slane, Patrick O., Burrows, David N., Roming, Peter W. A., Nousek, John A., ...
We continue our analysis of the Galactic oxygen-rich supernova remnant (SNR) G292.0+1.8, which was observed with the {\it Chandra X-ray Observatory}. The high angular resolution {\it Chandra} data...
Characteristics of Diffuse X-Ray Line Emission within 20 pc of the Galactic Center (2003)
Park, Sangwook, Muno, Michael P., Baganoff, Frederick K., Maeda, Yoshitomo, Morris, Mark, Howard, Christian, ...
Over the last 3 yrs, the Galactic center (GC) region has been monitored with the Chandra X-Ray Observatory. With 11 Chandra observations through 2002 June, the total effective exposure reaches ~590...
Monitoring The Evolution of SNR 1987A with Chandra (2003)
Park, Sangwook, Burrows, David N., Garmire, Gordon P., Zhekov, Svetozar A., McCray, Dick
We report on the results of our monitoring program of SNR 1987A with the Chandra X-Ray Observatory. The high resolution images and the spectra from the latest Chandra data suggest that the blast wave...
0103-72.6: A New Oxygen-Rich Supernova Remnant in the Small Magellanic Cloud (2003)
Park, Sangwook, Hughes, John P., Burrows, David N., Slane, Patrick O., Nousek, John A., Garmire, Gordon P.
0103$-$72.6, the second brightest X-ray supernova remnant (SNR) in the Small Magellanic Cloud (SMC), has been observed with the {\it Chandra X-Ray Observatory}. Our {\it Chandra} observation...
Feigelson, Eric D., Lawson, Warrick A., Garmire, Gordon P.
We present the outcomes of a Chandra X-ray Observatory snapshot study of five nearby Herbig Ae/Be (HAeBe) stars which are kinematically linked with the Oph-Sco-Cen Association (OSCA). Optical...
Detection of Magnesium-Rich Ejecta in the Middle-Aged Supernova Remnant N49B (2003)
Park, Sangwook, Hughes, John P., Slane, Patrick O., Burrows, David N., Warren, Jess Ica S., Garmire, Gordon P., ...
The middle-aged supernova remnant (SNR) N49B in the Large Magellanic Cloud has been observed with the {\it Chandra X-Ray Observatory}. The superb angular resolution of {\it Chandra} resolves the...
Coronal X-ray emission from an intermediate-age brown dwarf (2003)
Tsuboi, Yohko, Maeda, Yoshitomo, Feigelson, Eric D., Garmire, Gordon P., Chartas, George, Mori, Koji, ...
We report the X-ray detection of the brown dwarf (BD) companion TWA 5B in a $\simeq 12$ Myr old pre-main sequence binary system. We clearly resolve the faint companion (35 photons) separated from the...
X-Ray Emission from Multi-Phase Shock in the Large Magellanic Cloud Supernova Remnant N49 (2002)
Park, Sangwook, Burrows, David N., Garmire, Gordon P., Nousek, John A., Hughes, John P., Williams, Rosa Murphy
The supernova remnant (SNR) N49 in the Large Magellanic Cloud has been observed with the Advanced CCD Imaging Spectrometer (ACIS) on board the {\it Chandra X-Ray Observatory}. The superb angular...
X-ray Source Population in the Elliptical Galaxy NGC 720 with Chandra (2002)
Jeltema, Tesla E., Canizares, Claude R., Buote, David A., Garmire, Gordon P.
With a Chandra ACIS-S3 observation, we detect 42 X-ray point sources in the elliptical galaxy NGC 720, including a possible central source. Most of these sources will be low-mass X-ray binaries...
The Radial Structure of SNR N103B (2002)
Lewis, Karen T., Burrows, David N., Hughes, John P., Slane, Patrick O., Garmire, Gordon P., Nousek, John A.
We report on the results from a Chandra ACIS observation of the young, compact, supernova remnant N103B. The unprecedented spatial resolution of Chandra reveals sub-arcsecond structure, both in the...
The Compact Central Object in the Supernova Remnant G266.2-1.2 (2002)
Kargaltsev, Oleg, Pavlov, George G., Sanwal, Divas, Garmire, Gordon P.
We observed the compact central object CXOU J085201.4--461753 in the supernova remnant G266.2--1.2 (RX J0852.0--4622) with the Chandra ACIS detector in timing mode. The spectrum of this object can be...
Chandra Evidence for a Flattened, Triaxial Dark Matter Halo in the Elliptical Galaxy NGC 720 (2002)
Buote, David A., Jeltema, Tesla E., Canizares, Claude R., Garmire, Gordon P.
(Abridged) We present an analysis of a Chandra ACIS-S observation of the elliptical galaxy NGC 720 to verify the existence of a dark matter (DM) halo and to measure its ellipticity. The ACIS-S3 image...
Discovery of Soft X-Ray Emission from Io, Europa and the Io Plasma Torus (2002)
Elsner, Ronald F., Gladstone, G. Randall, Waite, J. Hunter, Crary, Frank J., Howell, Robert R., Johnson, Robert E., ...
We report the discovery of soft (0.25--2 keV) x-ray emission from the Galilean satellites Io and Europa, probably Ganymede, and from the Io Plasma Torus (IPT). Bombardment by energetic (>10 keV) H,...
Magnetic flaring in the pre-main sequence Sun and implications for the early solar system (2002)
Feigelson, Eric D., Garmire, Gordon P., Pravdo, Steven H.
To address the role of energetic processes in the solar nebula, we provide a detailed characterization of magnetic flaring in stellar analogs of the pre-main sequence Sun based on 23 hours...
X-ray spectrum of supernova remnant 1987A (2002)
Michael, Eli, Zhekov, Svetozar, McCray, Richard, Hwang, Una, Burrows, David N., Park, Sangwook, ...
We discuss the X-ray emission observed from supernova remnant 1987A with the Chandra X-Ray Observatory. We analyze a high- resolution spectrum obtained in 1999 October with the high- energy...
Discovery of soft X-ray emission from Io, Europa, and the Io Plasma Torus (2002)
Elsner, Ronald F., Gladstone, G. Randall, Waite, J. Hunter, Crary, Frank J., Howell, Robert R., Johnson, Robert E., ...
We report the discovery of soft (0.25-2 keV) X-ray emission from the Galilean satellites Io and Europa, probably Ganymede, and from the Io Plasma Torus (IPT). Bombardment by energetic (greater than...
The X-ray Spectrum of Supernova Remnant 1987A (2001)
Michael, Eli, Zhekov, Svetozar, McCray, Richard, Hwang, Una, Burrows, David N., Park, Sangwook, ...
We discuss the X-ray emission observed from Supernova Remnant 1987A with the Chandra X-ray Observatory. We analyze a high resolution spectrum obtained in 1999 October with the high energy...
Park, Sangwook, Roming, Peter W. A., Hughes, John P., Slane, Patrick O., Burrows, David N., Garmire, Gordon P., ...
We present results from the observation of the young Galactic supernova remnant (SNR) G292.0+1.8 with the Advanced CCD Imaging Spectrometer (ACIS) on board the {\it Chandra X-ray Observatory}. In the...
Monitoring the Evolution of the X-ray Remnant of SN 1987A (2001)
Park, Sangwook, Burrows, David N., Garmire, Gordon P., Nousek, John A., McCray, Richard, Michael, Eli, ...
We report on the results of our monitoring program of the remnant of SN 1987A with the Advanced CCD Imaging Spectrometer (ACIS) on board the {\it Chandra X-ray Observatory}. Two new observations have...
The Small-scale Structure of N103B - Nature of Nuture? (2001)
Lewis, Karen T., Burrows, David N., Hughes, John P., Slane, Patrick, Garmire, Gordon P., Nousek, John A.
We present new results from a 40.8 ks Chandra ACIS observation of the young supernova remnant (SNR) N103B located in the Large Magellanic Cloud. The high resolution Chandra image reveals structure at...
Chandra X-Ray Observatory Observation of the High-Redshift Cluster MS 1054-0321 (2001)
Jeltema, Tesla E., Canizares, Claude R., Bautz, Mark W., Malm, Michael R., Donahue, Megan, Garmire, Gordon P.
We observed MS 1054-0321, the highest redshift cluster of galaxies in the Einstein Medium Sensitivity Survey (EMSS), with the Chandra ACIS-S detector. We find the X-ray temperature of the cluster to...
Detection of Nuclear X-ray Sources in Nearby Galaxies with Chandra (2001)
Ho, Luis C., Feigelson, Eric D., Townsley, Leisa K., Sambruna, Rita M., Garmire, Gordon P., Brandt, W. N., ...
We report preliminary results from an arcsecond-resolution X-ray survey of nearby galaxies using ACIS on board Chandra. The total sample consists of 41 low-luminosity AGNs, including Seyferts,...
Improvement of the Spatial Resolution of the ACIS Using Split Pixel Events (2001)
Tsunemi, Hiroshi, Mori, Koji, Miyata, Emi, Baluta, Christopher, Burrows, David N., Garmire, Gordon P., ...
The position accuracy of X-ray photons on a CCD detector is generally believed to be limited by the CCD pixel size. While this is true in general, the position accuracy for X-ray events which deposit...
Kaspi, Shai, Brandt, W. N., Netzer, Hagai, George, Ian M., Chartas, George, Behar, Ehud, ...
(abridged) The high-resolution X-ray spectrum of NGC 3783 shows several dozen absorption lines and a few emission lines from the H-like and He-like ions of O, Ne, Mg, Si, and S as well as from Fe...
The X-ray Remnant of SN1987A (2000)
Burrows, David N., Michael, Eli, Hwang, Una, McCray, Richard, Chevalier, Roger A., Petre, Robert, ...
We present high resolution Chandra observations of the remnant of SN1987A in the Large Magellanic Cloud. The high angular resolution of the Chandra X-ray Observatory (CXO) permits us to resolve the...
Discovery of Narrow X-ray Absorption Lines from NGC 3783 with the Chandra HETGS (2000)
Kaspi, Shai, Brandt, W. N., Netzer, Hagai, Sambruna, Rita, Chartas, George, Garmire, Gordon P., ...
We present the first grating-resolution X-ray spectra of the Seyfert 1 galaxy NGC 3783, obtained with the High Energy Transmission Grating Spectrometer on the Chandra X-ray Observatory. These spectra...