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J/MNRAS/419/2095    HMXBs in nearby galaxies                 (Mineo+, 2012)

X-ray emission from star-forming galaxies. I. High-mass X-ray binaries. Mineo S., Gilfanov M., Sunyaev R. <Mon. Not. R. Astron. Soc. 419, 2095 (2012)> =2012MNRAS.419.2095M
ADC_Keywords: Binaries, X-ray ; Galaxies, nearby Keywords: X-rays: binaries ; X-rays: galaxies ; galaxies: starburst ; galaxies: spirals; galaxies: irregulars ; stars: formation Abstract: Based on a homogeneous set of X-ray, infrared and ultraviolet observations from Chandra, Spitzer, GALEX and 2MASS archives, we study populations of high-mass X-ray binaries (HMXBs) in a sample of 29 nearby star-forming galaxies and their relation with the star formation rate (SFR). In agreement with previous results, we find that HMXBs are a good tracer of the recent star formation activity in the host galaxy and their collective luminosity and number scale with the SFR, in particular, LX≈2.6x1039SFR. However, the scaling relations still bear a rather large dispersion of rms∼0.4dex, which we believe is of a physical origin. We present the catalog of 1057 X-ray sources detected within the D25 ellipse for galaxies of our sample and construct the average X-ray luminosity function (XLF) of HMXBs with substantially improved statistical accuracy and better control of systematic effects than achieved in previous studies. The XLF follows a power law with slope of 1.6 in the log(LX)∼35-40 luminosity range with a moderately significant evidence for a break or cut-off at LX∼1040erg/s. As before, we did not find any features at the Eddington limit for a neutron star or a stellar mass black hole. We discuss implications of our results for the theory of binary evolution. In particular we estimate the fraction of compact objects that once upon their lifetime experienced an X-ray active phase powered by accretion from a high mass companion and obtain a rather large number, fX∼0.2x(0.1Myr/τx) (τx is the life time of the X-ray active phase). This is about 4 orders of magnitude more frequent than in LMXBs. We also derive constrains on the mass distribution of the secondary star in HMXBs. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file sfgal.dat 86 29 Sample of nearby star-forming galaxies resolved by Chandra hmxb.dat 88 1055 High-mass X-ray binaries Catalogue
See also: B/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2011) Byte-by-byte Description of file: sfgal.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Galaxy Galaxy name (default catalog is NGC) 9- 10 I2 --- ID [1/29]+ Sequential number of galaxy 12- 16 F5.1 Mpc d Distance 18- 19 I2 --- r_d Reference for distance (1) 21- 32 A12 --- MType Hubble type (2) 34- 35 I2 deg i ?=- Inclination angle (3) 37- 39 F3.1 arcmin Rx Radius of the elliptical region used for the analysis (4) 41- 46 F6.3 Msun/yr SFR Star formation rate Spitzer and GALEX data (5) 48- 53 F6.4 Msun M* Stellar mass from 2MASS data (5) 55- 59 F5.2 10-10/yr SFR/M* Specific star formation rate (6) 61- 65 F5.2 [10-7W] logLlim logarithm of the sensitivity limit in 0.5-8keV band (7) 67- 68 I2 --- Nxrb Number of detected XRBs (8) 70- 74 F5.2 [10-7W] logLxrb logarithm of the collective X-ray luminosity of XRBs in the 0.5-8keV band (9) 76- 80 F5.2 --- Ncxb Predicted number of cosmic X-ray background sources (10) 82- 86 F5.2 [10-7W] logLcxb logarithm of the predicted X-ray luminosity of the CXB sources
Note (1): References for distances as follows: 1 = Sanders et al. (2003AJ....126.1607S) 2 = Tully (1988Sci...242..310T) 3 = Grise et al. (2008A&A...486..151G) 4 = Georgiev et al. (2006A&A...452..141G) 5 = Makarova & Karachentsev (2003Ap.....46..144M) 6 = Willick et al. (1997ApJS..109..333W) 7 = Saha et al. (2006ApJS..165..108S) 8 = Sakai & Madore (1999ApJ...526..599S) 9 = Ismail et al. (2005JKoAS..38....7I) 10 = Saviane, Hibbard, & Rich (2004AJ....127..660S) 11 = Drozdovsky et al. (2002AJ....124..811D) 12 = Seth, Dalcanton, & de Jong (2005AJ....129.1331S) 13 = Takats & Vinko (2006MNRAS.372.1735T) 14 = Sakai et al. (2004ApJ...608...42S) 15 = Drozdovsky & Karachentsev (2000A&AS..142..425D) 16 = Tully et al. (2009AJ....138..323T) 17 = Wolter & Trinchieri (2004A&A...426..787W) Note (2): Hubble type from de Vaucouleurs, de Vaucouleurs, & Corwin, 1976RC2...C......0D (Cat. VII/112) Note (3): Inclination angles from Tully (1988Sci...242..310T). Note (4): Radius of the galactic region where the HMXBs dominate the compact X-ray source population, defined by mean of spatial analysis performed on individual galaxies (see Sect.4.3 of the reference paper for description). For The Antennae we have analyzed a region that includes the two galaxies in the merging system (NGC4038 and NGC4039). It is centered at RA=180.472-18.881°(J2000) and has axis ratio=1.4 and PA=78°. Note (5): Estimated inside the galactic regions (Sect.4.3 of the reference paper). Note (6): Star formation rate-to-stellar mass ratio. Note (7): The sensitivity limit is defined as the luminosity level corresponding to a value of the incompleteness function K(L)=0.6. Note (8): Number of X-Ray Binaries with luminosity above the sensitivity limit, detected within the galactic region where the HMXBs (high-mass XRB) dominate the compact X-ray source population. It corresponds to the total number of detected point sources corrected for the predicted contribution of CXB sources in the same area. Note (9): Base-10 logarithm of the total X-ray luminosity of galaxies in the 0.5-8keV band, estimated by using eq. (21). Note (10): Predicted number of Cosmic X-ray background (CXB) sources within the selected region, with luminosity above the sensitivity limit.
Byte-by-byte Description of file: hmxb.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Galaxy Galaxy name (default catalog is NGC) 9- 11 I3 --- Seq Sequential number of X-ray source in Galaxy 13- 16 A4 --- CXO Chandra X-ray Observatory (CXO) designation (1) 18- 33 A16 --- CXOJ Chandra X-ray Observatory (CXO) source name (JHHMMSS.s-DDMMSS) 35- 43 F9.5 deg RAdeg Right ascension (J2000) 45- 53 F9.5 deg DEdeg Declination (J2000) 55- 59 F5.1 arcsec d Distance from the galaxy center 61- 67 F7.1 ct S Number of source counts after background subtraction 69- 73 F5.1 ct e_S rms uncertainty on S 75- 80 F6.2 [mW/m2] logFx logarithm of the X-ray flux, 0.5-8keV 82- 86 F5.2 [10-7W] logLx logarithm of the X-ray luminosity, 0.5-8keV 88 I1 --- loc [1/3] location flag (2)
Note (1): CXO designation, according to the CHANDRA-discovered source naming convention: CXOU is used for "unregistered" sources found, CXO is used for sources matched with the The Chandra Source Catalog (CSC). Note (2): Location flag as follows: 1 = point sources detected in the galactic area dominated by high-mass X-ray binary (HMXB) population 2 = point sources detected in the outer region dominated by CXB sources 3 = point sources detected in the bulge and assumed to be low-mass X-ray binaries (LMXBs)
Acknowledgements: Stefano Mineo, mineo(at)MPA-Garching.MPG.DE (MPA-Garching)
(End) Stefano Mineo [MPA-Garching], Francois Ochsenbein [CDS] 26-Sep-2011
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