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J/ApJ/586/814       NGC 4472 Chandra/HST study               (Maccarone+, 2003)

The low-mass X-ray binary-globular connection. II. NGC 4472 X-ray source properties and source catalogs. Maccarone T.J., Kundu A., Zepf S.E. <Astrophys. J. 586, 814 (2003)> =2003ApJ...586..814M
ADC_Keywords: Galaxies, photometry ; X-ray sources ; Cross identifications ; Clusters, globular Keywords: galaxies: general - galaxies: individual (NGC 4472) - galaxies: star clusters - globular clusters: general - X-rays: binaries - X-rays: galaxies Abstract: We present the results of a Chandra/Hubble Space Telescope (HST) study of the point sources of the Virgo Cluster giant elliptical galaxy NGC 4472. We identify 144 X-ray point sources outside the nuclear region, 72 of which are located within the HST fields. The optical data show 1102 sources, of which 829 have colors consistent with being globular clusters (with only four in the restricted central 10" region). Thirty matches are found between the two lists - these are likely to be low-mass X-ray binaries (LMXBs) associated with globular clusters, while ∼42 of the X-ray sources have no optical counterparts to V≲25 and I≲24, indicating that they are likely to be predominantly LMXBs in the field star population with a small amount of possible contamination from background active galactic nuclei. Thus approximately 40% of the X-ray sources are in globular clusters and 4% of the globular clusters contain X-ray sources. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 88 147 The X-ray Source List table2.dat 75 1102 The Optical Source List table3.dat 144 30 X-Ray/HST Matches
See also: J/A+AS/127/367 : Virgo Photometry Catalogue (VPC) (Young+ 1998) J/A+A/402/37 : UV to radio SED of galaxies in Virgo cluster (Boselli+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- XID X-ray catalog Number, [MKZ2003] XID NNN 5- 10 A6 --- --- [CXOMKZ] 12- 26 A15 --- CXOMKZ CXOMKZ Source Name (JHHMMSSs+DDMMSS) 28- 31 F4.2 --- Gamma Spectral index in photon space 33- 37 F5.2 --- EGamma ? 90% error in the positive direction (G1) 39- 43 F5.2 --- eGamma ? 90% error in the negative direction (G1) 45- 52 E8.2 mW/m2 SFlux The (0.5-2.0keV) X-ray model flux (G2) 54- 61 E8.2 mW/m2 HFlux The (2.0-8.0keV) X-ray model flux (G2) 63- 70 E8.2 10-7W XLum The (0.5-8.0keV) X-ray luminosity (G2) 72- 76 F5.1 --- Chi2 The chi2 of the model fit 78- 79 I2 --- DOF Degrees of freedom 81 A1 --- GR [YN] Good region flag (3) 83 A1 --- HST HST region flag (4) 85- 88 I4 --- OID ? The optical catalog number, [MKZ2003] OID NNNN (5)
Note (3): Y indicates the source is outside the central 10" region associated with nuclear emission. Note (4): Y indicates the source is in one or more of the HST observation regions. Note (5): Refers to the catalog number in table 3. A blank indicates the source has no counterpart in the HST data set.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- OID Optical catalog number, [MKZ2003] OID NNNN 6- 7 I2 h RAh Right Ascension (J2000) 9- 10 I2 min RAm Right Ascension (J2000) 12- 15 F4.1 s RAs Right Ascension (J2000) 17 A1 --- DE- Declination (J2000) 18 I1 deg DEd Declination (J2000) 20- 21 I2 arcmin DEm Declination (J2000) 23- 26 F4.1 arcsec DEs Declination (J2000) 28- 32 F5.2 mag Vmag The V band magnitude 34- 37 F4.2 mag e_Vmag Error in Vmag 39- 43 F5.2 mag Imag The I band magnitude 45- 48 F4.2 mag e_Imag Error in Imag 50- 53 F4.2 mag V-I The V-I color 55- 58 F4.2 mag e_V-I Error in V-I 60- 63 F4.1 arcsec HLRad Half-light radius 65- 67 F3.1 arcsec e_HLRad Error in HLRad 69 A1 --- CX [YN] Chandra FOV flag (1) 71 A1 --- GC [YN] Globular cluster color flag (2) 73- 75 I3 --- XID ? X-ray counterpart ID number, [MKZ2003] XID NNN (3)
Note (1): Y indicates the source is in the Chandra field of view Note (2): Y indicates the source has colors consistent with globular clusters (0.8<V-I<1.2) Note (3): Refers to the catalog number in table 1. A blank indicates the source has no counterpart in the Chandra data set.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- XID X-ray catalog number, [MKZ2003] XID NNN 5- 10 A6 --- --- [CXOMKZ] 12- 26 A15 --- CXOMKZ CXOMKZ source name (JHHMMSSs+DDMMSS) 28- 31 F4.2 --- Gamma Best-fitting power-law spectral index 33- 36 F4.2 --- EGamma ? 90% error in the positive direction (G1) 38- 41 F4.2 --- eGamma ? 90% error in the positive direction (G1) 42 A1 --- n_Gamma [fb] Note on Gamma (1) 44- 51 E8.2 mJy SFlux (0.5-2.0keV) X-ray model flux (G2) 53- 60 E8.2 mJy HFlux (2.0-8.0keV) X-ray model flux (G2) 62- 69 E8.2 10-7W XLum (0.5-8.0keV) X-ray luminosity (G2) 71- 74 F4.1 --- Chi2 chi2 value of the spectral fit 76- 77 I2 --- DOF Degree of freedom of the spectral fit 79- 82 I4 --- OID Optical catalog number, [MKZ2003] OID NNNN 84- 85 I2 h RAh Right ascension (J2000) 87- 88 I2 min RAm Right ascension (J2000) 90- 93 F4.1 s RAs Right ascension (J2000) 95 A1 --- DE- Declination sign (J2000) 96 I1 deg DEd Declination (J2000) 98- 99 I2 arcmin DEm Declination (J2000) 101-104 F4.1 arcsec DEs Declination (J2000) 106-110 F5.2 mag Vmag V magnitude 112-115 F4.2 mag e_Vmag rms uncertainty on Vmag 117-121 F5.2 mag Imag I magnitude 123-126 F4.2 mag e_Imag rms uncertainty on Imag 128-131 F4.2 mag V-I V-I colour index 133-136 F4.2 mag e_V-I rms uncertainty on V-I 138-141 F4.2 --- HLRad Half-light radius of the optical counterpart 142-144 F3.1 --- e_HLRad rms uncertainty on HLRad
Note (1): Note on Gamma: f: fixed, b: bad fit
Global notes: Note (G1): For small numbers of channels, Gamma is frozen to 2.0 and no errors are given. There are also no errors for sources with Chi2/DOF>2.0. Note (G2): Flux comes from the flux command in XSPEC. Luminosity comes from assuming isotropic emission and a distance of 16Mpc, and correcting flux for absorption.
History: From electronic version of the journal References: Kundu et al. Paper I 2002ApJ...574L...5K
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 22-May-2003
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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