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X-Ray Spectral Properties of Low-Mass X-Ray Binaries in Nearby Galaxies
- J. Irwin, A. Athey, J. Bregman
- Physics
- 18 December 2002
We have investigated the X-ray spectral properties of a collection of low-mass X-ray binaries (LMXBs) within a sample of 15 nearby early-type galaxies using proprietary and archival data from the…
X-Ray Evidence for the Interaction of the Giant Elliptical Galaxy NGC 4472 with its Virgo Cluster Environment
- J. Irwin, C. Sarazin
- Physics
- 10 November 1996
We analyze X-ray spatial and spectral data on the giant elliptical galaxy NGC 4472, the brightest galaxy in the Virgo cluster. The X-ray contours of NGC 4472 are elongated in the northeast-southwest…
Classifying X-Ray Sources in External Galaxies from X-Ray Colors
- A. Prestwich, J. Irwin, B. Boroson
- Physics
- 1 October 2003
The X-ray populations of Local Group galaxies have been classified in detail by Einstein, ROSAT, and ASCA, revealing a mix of binaries, supernova remnants (SNRs), and H II regions. However, these…
CHANDRA X-RAY OBSERVATIONS OF THE X-RAY FAINT ELLIPTICAL GALAXY NGC 4697
- C. Sarazin, J. Irwin, J. Bregman
- Physics
- 3 April 2001
A Chandra ACIS S3 observation of the X-ray faint elliptical galaxy NGC 4697 resolves much of the X-ray emission (61% of the counts from within one effective radius) into 90 point sources, of which…
Low-Mass X-Ray Binaries and Globular Clusters in Early-Type Galaxies
- C. Sarazin, A. Kundu, J. Irwin, G. Sivakoff, E. Blanton, S. Randall
- Physics
- 7 July 2003
A high fraction of the low-mass X-ray binaries (LMXBs) in early-type galaxies are associated with globular clusters (GCs). Here we discuss the correlations between LMXBs and GCs in a sample of four…
Resolving the Bondi Accretion Flow toward the Supermassive Black Hole of NGC 3115 with Chandra
- Ka-wah Wong, J. Irwin, U. Michigan
- Physics
- 15 June 2011
Gas undergoing Bondi accretion onto a supermassive black hole (SMBH) becomes hotter toward smaller radii. We searched for this signature with a Chandra observation of the hot gas in NGC 3115, which…
Flows of X-ray gas reveal the disruption of a star by a massive black hole
- Jon M. Miller, J. Kaastra, N. Tanvir
- PhysicsNature
- 21 October 2015
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Resolving the Mystery of X-Ray Faint Elliptical Galaxies
- C. Sarazin, J. Irwin, J. Bregman
- Physics
- 27 September 2000
Chandra observations of the X-ray-faint elliptical galaxy NGC 4697 resolve much of the X-ray emission (61% within one effective radius) into ~80 point sources, of which most are low-mass X-ray…
The lack of very ultraluminous X-ray sources in early-type galaxies
- J. Irwin, J. Bregman, A. Athey
- Physics
- 15 December 2003
We have searched for ultraluminous X-ray sources (ULXs) in a sample of 28 elliptical and S0 galaxies observed with Chandra. We find that the number of X-ray sources detected at a flux level that…
O VI Observations of Galaxy Clusters: Evidence for Modest Cooling Flows
- J. Bregman, A. Fabian, E. Miller, J. Irwin
- Physics
- 14 February 2006
A prediction of the galaxy-cluster cooling flow model is that as gas cools from the ambient cluster temperature, emission lines are produced in gas at subsequently decreasing temperatures. Gas…
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