M31CXO2 - M 31 Bulge Chandra X-Ray Point Source Catalog
To a limiting luminosity of ~1035 erg s-1, the authors find 263 X-ray point sources, with ~1/3 of these being background galaxies. A study of the spatial distribution and the luminosity function of the X-ray sources shows that the distribution of primordial LMXBs is consistent with the distribution of the K-band light and that their luminosity function flattens below ~1037 erg s-1 to the dN/dL ~ L-1 law in agreement with the behavior found earlier for LMXBs in the Milky Way and in Cen A. Within a radius of 12 arcminutes, the luminosity function is independent of distance to the center of M 31, in contrast to earlier Chandra studies. The LMXBs located in globular clusters and within ~1 arcminute from the center of M 31 are presumably created via dynamical interactions. The dynamical origin of the r < 1 arcminute sources is strongly suggested by their radial distribution which follows the rho*2 profile rather than the K-band light distribution. Their luminosity function shows a prominent fall-off below log(LX) <~ 36.5. Although the statistics are insufficient to claim a genuine low-luminosity cut-off in the luminosity function, the best fit power-law with a slope of -0.6 +/- 0.2 is significantly flatter than the dN/dL ~ L-1 law. The authors also searched for transients and found 28 sources that varied by a factor larger than 20. Their spatial distribution follows the distribution of the persistent LMXBs within the accuracy allowed by the limited number of transients.
A study of the population of LMXBs in the bulge of M31. Voss R., Gilfanov M. <Astron. Astrophys., 468, 49-59 (2007)> =2007A&A...468...49V
A sequential identification number for the X-ray source which uniquely identifies each source in the catalog, in order of increasing angular offset from the center of M 31.
The X-ray source designation using the '[VG2007]' prefix (for Voss and Gilfanov 2007) and the source number, as recommended by the CDS Dictionary of Nomenclature of Celestial Objects.
The Right Ascension of the X-ray source in the selected equinox. This was given in J2000 coordinates and to a precision of 0.01 seconds of time in the original table.
The Declination of the X-ray source in the selected equinox. This was given in J2000 coordinates and to a precision of 0.1 arcseconds in the original table.
The Galactic Longitude of the X-ray source.
The Galactic Latitude of the X-ray source.
The angular distance of the X-ray source from the center of M 31 (J2000 coordinates of 00:42:44.31, +41:16:09.4), in arcseconds.
The number of counts C in the source region in the energy range 0.5 - 8 keV before correction for PSF, background and confusing sources.
The X-ray source counts S calculated according to equation (1) of the reference paper, including correction for PSF, background and confusing sources.
The statistical error in the X-ray source counts S calculated according to equation (2) of the reference paper.
The X-ray luminosity of the source in the energy range 0.5 - 8 keV, in erg s-1, calculated assuming the source is at the 780 kpc distance of M 31.
A broad source classification, using the following abbreviations:
GC = confirmed globular cluster GCC = globular cluster candidate PN = planetary nebula FGS = foreground star Nova = nova Rnova = nova (random match) EmO = emission line object RAD = radio source SNR = supernova remnant EXT = extended source t = transient source
A precise source identification and references thereof, using the following abbreviations:
B68 = Borngen (1968AN....291...19BA), [B68] NN in Simbad B90 = Braun (1990ApJS...72..761B), [B90] NNN in Simbad Bol = Galleti et al. (2004, Cat. <J/A+A/416/917>), Bol NNN in Simbad CFN = Ciardullo et al. (1987ApJ...318..520C, [CFN87] NN in Simbad CIA = Ciardullo et al. (1989, Cat. <J/ApJ/339/53>), Ford M 31 NNN Cra = Crampton et al. (1984ApJ...284..663C), C84 NNN in Simbad Fan = Fan et al. (2005PASP..117.1236F), [FMZ2005] NN in Simbad GLG = Gelfand et al. (2004, Cat. <J/ApJS/155/89>), GLG NNN MG = Magnier et al. (1995, Cat. <J/A+AS/114/215>), [MPV95] B-NNN in Simbad MLA = Meyssonnier et al. (1993, Cat. <J/A+AS/102/251>), MLA NNNN in Simbad Mita = Magnier, 1993, Ph.D. Thesis, MIT PIE = Pietsch et al. (2005A&A...442..879P), [PFF2005] WeCAPP-NYYYY-NN SI = Shafter & Irby (2001ApJ...563..749S), [SI2001] 1997-06 in Simbad) SIM = Simbad, WSTB 37W135 in Simbad W2 = Williams et al. (2004AJ....128.1588W)
The source designation in Kong et al. (2002, Cat. J/ApJ/577/738), Williams et al. (2004, Cat. J/ApJ/609/735), and/or Williams et al. (2004AJ....128.1588W).
Sources not included in Kong et al. (2002, Cat. J/ApJ/577/738), Williams et al. (2004, Cat. J/ApJ/609/735), and/or Williams et al. (2004AJ....128.1588W) are indicated by 'K' if observed in Kaaret (2002, Cat. <J/ApJ/578/114>), else by 'X' to indicate that that these are new sources.
The HEASARC Browse object classification, based on the broad_type parameter value when available.