Early-Type Galaxies Chandra X-Ray Point Source Catalog

Early-Type Galaxies Chandra X-Ray Point Source Catalog ETGALCXO ivo://nasa.heasarc/etgalcxo NASA/GSFC HEASARC Humphrey, Buote 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the results of a Chandra survey of low-mass X-ray binaries (LMXBs) in 24 early-type galaxies. Correcting for detection incompleteness, the X-ray luminosity function (XLF) of each galaxy is consistent with a power law with negative logarithmic differential slope, Beta, ~ 2.0. However, Beta strongly correlates with incompleteness, indicating the XLF flattens at low X-ray luminosity (LX). The composite XLF is well fitted by a power law with a break at (2.21 [+0.65,-0.56]) x 1038 erg s-1 and Beta = 1.40 [+0.10,-0.13] and = 2.84 [+0.39,-0.30] below and above it, respectively. The break is close to the Eddington limit for a 1.4 solar-mass neutron star, but the XLF shape rules out its representing the division between neutron star and black hole systems. Although the XLFs are similar, the authors find evidence of some variation between galaxies. The high-LX XLF slope does not correlate with age, but may correlate with [Alpha/Fe]. Considering only LMXBs with LX > 1037 erg s-1, matching the LMXBs with globular clusters (GCs) identified in HST observations of 19 of the galaxies, the authors find the probability a GC hosts an LMXB is proportional to LGCAlpha ZFeGamma where Alpha = 1.01 +/- 0.19 and Gamma = 0.33 +/- 0.11. Correcting for GC luminosity and color effects, and detection incompleteness, they find no evidence that the fraction of LMXBs with LX > 1037 erg s-1 in GCs (40%), or the fraction of GCs hosting LMXBs (~ 6.5%) varies between galaxies. The spatial distribution of LMXBs resembles that of GCs, and the specific frequency of LMXBs is proportional to the GC specific luminosity, consistent with the hypothesis that all LMXBs form in GCs. If the LMXB lifetime is TauL and the duty cycle is Fd, their results imply ~ 1.5(TauL/108 yr)-1 Fd-1 LMXBs are formed per gigayear per GC, and they place an upper limit of one active LMXB in the field per 3.4 x 109 solar luminosities of V-band luminosity. This table contains 1194 X-ray point sources that were detected within the B-band 25th magnitude ellipse D25 (as listed in the de Vaucouleurs et al. Catalog of Bright Galaxies) of 24 early-type galaxies observed by Chandra (listed in Table 1 of the reference paper). The D25 restriction should mitigate against contamination by background AGNs. This table was created by the HEASARC in February 2009 based on the electronic versions of Table 6 from the paper which was obtained from the Astrophysical Journal web site. This is a service provided by NASA HEASARC . 2008ApJ...689..983H https://heasarc.gsfc.nasa.gov/W3Browse/all/etgalcxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=etgalcxo& GET text/xml 180 99999 true 64.0675 -55.81138889 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=etgalcxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_etgalcxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public etgalcxo Early-Type Galaxies Chandra X-Ray Point Source Catalog name Source Identification meta.id;meta.main char nullable galaxy_name Host Galaxy Identification meta.id.assoc char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable counts Total Counts Detected ct phot;em.X-ray double nullable lx X-Ray (0.3-7 keV) Luminosity (erg/s) erg/s phys.luminosity;em.X-ray double nullable lx_error Uncertainty in X-Ray (0.3-7 keV) Luminosity (erg/s) erg/s stat.error;phys.luminosity;em.X-ray double nullable center_offset Projected Distance from Galaxy Center (arcmin) arcmin pos.angDistance double nullable hr1 Hardness Ratio HR1 phot.count;arith.ratio;em.X-ray double nullable gc_catalog_number Globular Cluster Catalog Number meta.id.assoc char nullable bii Galactic Latitude degree pos.galactic.lat double nullable hr2_error Uncertainty in HR2 stat.error;phot.count;arith.ratio;em.X-ray double nullable hr2 Hardness Ratio HR2 phot.count;arith.ratio;em.X-ray double nullable lii Galactic Longitude degree pos.galactic.lon double nullable hr1_error Uncertainty in HR1 stat.error;phot.count;arith.ratio;em.X-ray double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable