AROUND 200 NEW X-RAY BINARY IDs FROM 13 YR OF CHANDRA OBSERVATIONS OF THE M31 CENTER

We have created 0.3-10 keV, 13 yr, unabsorbed luminosity lightcurves for 528 X-ray sources in the central 20' of M31. We have 174 Chandra observations spaced at ~1 month intervals due to our transient monitoring program, deeper observations of the M31 nucleus, and some public data from other su...

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Bibliographic Details
Main Authors: Barnard, R. (Author), Garcia, M. R. (Author), Primini, F. (Author), Li, Z. (Author), Murray, Stephen S. (Author), Baganoff, Frederick K (Author)
Other Authors: MIT Kavli Institute for Astrophysics and Space Research (Contributor), Baganoff, Frederick K. (Contributor)
Format: Article
Language:English
Published: IOP Publishing, 2015-02-20T13:51:48Z.
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Online Access:Get fulltext
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042 |a dc 
100 1 0 |a Barnard, R.  |e author 
100 1 0 |a MIT Kavli Institute for Astrophysics and Space Research  |e contributor 
100 1 0 |a Baganoff, Frederick K.  |e contributor 
700 1 0 |a Garcia, M. R.  |e author 
700 1 0 |a Primini, F.  |e author 
700 1 0 |a Li, Z.  |e author 
700 1 0 |a Murray, Stephen S.  |e author 
700 1 0 |a Baganoff, Frederick K  |e author 
245 0 0 |a AROUND 200 NEW X-RAY BINARY IDs FROM 13 YR OF CHANDRA OBSERVATIONS OF THE M31 CENTER 
260 |b IOP Publishing,   |c 2015-02-20T13:51:48Z. 
856 |z Get fulltext  |u http://hdl.handle.net/1721.1/95433 
520 |a We have created 0.3-10 keV, 13 yr, unabsorbed luminosity lightcurves for 528 X-ray sources in the central 20' of M31. We have 174 Chandra observations spaced at ~1 month intervals due to our transient monitoring program, deeper observations of the M31 nucleus, and some public data from other surveys. We created 0.5-4.5 keV structure functions (SFs) for each source for comparison with the ensemble SF of active galactic nuclei (AGN). We find 220 X-ray sources with luminosities [> over ~]10[superscript 35] erg s[superscript -1] that have SFs with significantly more variability than the ensemble AGN SF, and which are likely X-ray binaries (XBs). A further 30 X-ray sources were identified as XBs using other methods. We therefore have 250 probable XBs in total, including ~200 new identifications. This result represents great progress over the ~50 XBs and ~40 XB candidates previously identified out of the ~2000 X-ray sources within the D [subscript 25] region of M31; it also demonstrates the power of SF analysis for identifying XBs in external galaxies. We also identify a new transient black hole candidate, associated with the M31 globular cluster B128. 
520 |a Chandra X-ray Center (U.S.) (Grant GO2-13106X) 
520 |a Chandra X-ray Center (U.S.) (Grant GO3-14095X) 
546 |a en_US 
655 7 |a Article 
773 |t The Astrophysical Journal