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J/ApJ/829/20     Chandra ACIS survey in nearby galaxies. II        (Wang+, 2016)

Chandra ACIS Survey of X-Ray Point Sources in Nearby Galaxies. II. X-Ray Luminosity Functions and Ultraluminous X-Ray Sources. Wang S., Qiu Y., Liu J., Bregman J.N. <Astrophys. J., 829, 20 (2016)> =2016ApJ...829...20W
ADC_Keywords: X-ray sources ; Galaxies, nearby ; Surveys Keywords: catalogs ; galaxies: general ; X-rays: binaries ; X-rays: galaxies Abstract: Based on the recently completed Chandra/ACIS survey of X-ray point sources in nearby galaxies, we study the X-ray luminosity functions (XLFs) for X-ray point sources in different types of galaxies and the statistical properties of ultraluminous X-ray sources (ULXs). Uniform procedures are developed to compute the detection threshold, to estimate the foreground/background contamination, and to calculate the XLFs for individual galaxies and groups of galaxies, resulting in an XLF library of 343 galaxies of different types. With the large number of surveyed galaxies, we have studied the XLFs and ULX properties across different host galaxy types, and confirm with good statistics that the XLF slope flattens from lenticular (α∼1.50±0.07) to elliptical (∼1.21±0.02), to spirals (∼0.80±0.02), to peculiars (∼0.55±0.30), and to irregulars (∼0.26±0.10). The XLF break dividing the neutron star and black hole binaries is also confirmed, albeit at quite different break luminosities for different types of galaxies. A radial dependency is found for ellipticals, with a flatter XLF slope for sources located between D25 and 2D25, suggesting the XLF slopes in the outer region of early-type galaxies are dominated by low-mass X-ray binaries in globular clusters. This study shows that the ULX rate in early-type galaxies is 0.24±0.05 ULXs per surveyed galaxy, on a 5σ confidence level. The XLF for ULXs in late-type galaxies extends smoothly until it drops abruptly around 4x1040erg/s, and this break may suggest a mild boundary between the stellar black hole population possibly including 30M☉ black holes with super-Eddington radiation and intermediate mass black holes. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 112 343 X-Ray point source populations in 343 nearby galaxies
See also: IX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012) VII/109 : IRAS Observations of Large Optical Galaxies (Rice+, 1988) J/MNRAS/419/2095 : HMXBs in nearby galaxies (Mineo+, 2012) J/ApJ/741/49 : ULX candidates in nearby galaxies (Swartz+, 2011) J/ApJS/192/10 : Chandra ACIS survey in 383 nearby galaxies. I. (Liu, 2011) J/ApJ/689/983 : LMXBs in early-type galaxies. I. Chandra (Humphrey+, 2008) J/ApJ/681/1163 : Late-type galaxies in Chandra deep fields (Lehmer+, 2008) J/ApJ/662/525 : LMXBs in globular clusters of 5 galaxies (Kundu+, 2007) J/A+A/429/1125 : Catalog of Ultraluminous X-ray sources (Liu+, 2005) J/ApJS/150/19 : ChaMP. I. First X-ray source catalog (Kim+, 2004) J/ApJ/602/231 : Chandra X-ray point sources in nearby galaxies (Colbert+, 2004) J/AJ/124/2351 : Chandra Deep Field North survey. XII (Bauer+, 2002) J/MNRAS/330/547 : Local galaxy ages and metallicities (Terlevich+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Galaxy ? Galaxy name 10- 11 I2 --- Nobs [1/28]? Number of observations (1) 13- 15 I3 --- Nsrc [0/434]? Number of X-ray point sources (2) 17- 19 I3 --- NXt [0/292]? Number of sources detected (3) 21- 24 F4.2 --- fCov [0.31/1]? Sky coverage (4) 26- 30 F5.2 [10-7W] LXlim [35.38/39.83]? Limiting X-ray luminosity (5) 32- 34 I3 --- NX [0/255]? Number of sources detected above LXlim 36- 41 F6.2 --- Nb/f [0/237.18]? Predicted foreground/background sources for L>LXlim 43- 44 I2 --- NUa [0/16]? Number of ULXs found in all observations 46- 50 F5.2 --- nU [-1.72/8.93]? Net number of ULXs from this stitched survey (6) 52- 55 F4.2 --- nb/f [0/1.72]? Predicted foreground/background sources for L>2.1039erg/s 57- 66 A10 --- GType ? Galaxy type 68- 74 E7.2 Lsun LB ? Blue light content of the galaxy 76- 82 F7.2 arcmin2 GArea [0.29/2318.71]? D25 isophotal area 84- 90 F7.4 Mpc Dist [0.8166/49.5]? Galaxy distance 92 A1 --- l_SFR60um [<]? Limit flag on SFR60um 93-100 F8.5 Msun/yr SFR60um [0.00034/55.4]? Star formation rate (7) 102-112 A11 --- Activity ? Star-forming and nuclear activities
Note (1): Number of ACIS observations utilized in Liu et al. (2011, Cat. J/ApJS/192/10) Note (2): Number of X-ray point sources detected above 4σ in all observations. Note (3): Number of sources detected above 4σ in the stitched deep survey. Note (4): Surveyed area A as a fraction of the D25 isophotal area. Note (5): Limiting X-ray luminosity at which the surveyed blue light is 50% of the total blue light surveyed. Note (6): Number of ULXs detected in the deep survey minus the predicted foreground/background sources for L>2.1039erg/s. Note (7): Star formation rate estimated based on the flux density at 60µm observed by IRAS.
History: From electronic version of the journal References: Liu et al. Paper I 2011ApJS..192...10L
(End) Marianne Brouty [CDS] 06-Mar-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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