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J/ApJ/651/1098      Faint X-ray sources in Terzan 5          (Heinke+, 2006)

Faint X-ray sources in the globular cluster Terzan 5. Heinke C.O., Wijnands R., Cohn H.N., Lugger P.M., Grindlay J.E., Pooley D., Lewin W.H.G. <Astrophys. J., 651, 1098-1111 (2006)> =2006ApJ...651.1098H
ADC_Keywords: Clusters, globular ; X-ray sources Keywords: globular clusters: individual (Terzan 5) - novae, cataclysmic variables - stars: neutron - X-rays: binaries Abstract: We report our analysis of a Chandra X-ray observation of the rich globular cluster Terzan 5, in which we detect 50 sources to a limiting 1.0-6keV X-ray luminosity of 3x1031ergs/s within the half-mass radius of the cluster. Thirty-three of these have LX>1032ergs/s, the largest number yet seen in any globular cluster. In addition to the quiescent low-mass X-ray binary (LMXB; identified by Wijnands et al., 2005ApJ...618..883W), another 12 relatively soft sources may be quiescent LMXBs. We compare the X-ray colors of the harder sources in Terzan 5 to the Galactic center sources studied by Muno and collaborators (2003, Cat. J/ApJ/589/225) and find the Galactic center sources to have harder X-ray colors, indicating a possible difference in the populations. We cannot clearly identify a metallicity dependence in the production of low-luminosity X-ray binaries in Galactic globular clusters, but a metallicity dependence of the form suggested by Jordan et al. (2004, Cat. J/ApJ/613/270) for extragalactic LMXBs is consistent with our data. Description: We observed Terzan 5 with Chandra for 39.3ks on 2003 July 13-14 using the Advanced CCD Imaging Spectrometer (ACIS) S3 chip. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 137 50 X-Ray Sources in Terzan 5 table2.dat 121 77 Serendipitous sources in the Terzan 5 field
See also: J/A+A/308/733 : NTT VI photometry in Terzan 5 (Ortolani+ 1996) J/ApJ/589/225 : Chandra X-ray sources toward Galactic Center (Feigelson+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- CX [1/50] CX (Chandra) number, [HWC2006] CX NN in Simbad 4- 18 A15 --- CXOGlbJ CXOGlbJ name (HHMMSS.s+DDMMSS), CXOGlb JHHMMSS.s+DDMMSS in Simbad 20- 21 I2 h RAh Right ascension (J2000) 23- 24 I2 min RAm Right ascension (J2000) 26- 31 F6.3 s RAs Right ascension (J2000) 33- 37 F5.3 s e_RAs rms uncertainty on RA 39 A1 --- DE- Declination sign (J2000) 40- 41 I2 deg DEd Declination (J2000) 43- 44 I2 arcmin DEm Declination (J2000) 46- 50 F5.2 arcsec DEs Declination (J2000) 52- 55 F4.2 arcsec e_DEs rms uncertainty on DE 57- 61 F5.2 arcsec Dist Distance from the center of Terzan 5 63- 67 F5.1 ct C(0.5-2) Counts in 0.5-2keV band 69- 72 F4.1 ct E_C(0.5-2) Error on C(0.5-2keV) (upper limit) 74- 77 F4.1 ct e_C(0.5-2) Error on C(0.5-2keV) (lower limit) 79- 83 F5.1 ct C(2-6) Counts in 2-6keV band 85- 88 F4.1 ct E_C(2-6) Error on C(2-6keV) (upper limit) 90- 93 F4.1 ct e_C(2-6) Error on C(2-6keV) (lower limit) 95- 98 I4 10+23W LX(1-6) X-ray luminosity in the 1-6keV band 100-102 I3 10+23W E_LX(1-6) Error on LX(1-6keV) (upper limit) 104-106 I3 10+23W e_LX(1-6) Error on LX(1-6keV) (lower limit) 108-111 I4 10+23W LX(0.5-2.5) X-ray luminosity in the 0.5-2.5keV band 113-116 I4 10+23W E_LX(0.5-2.5) Error on LX(0.5-2.5keV) (upper limit) 118-120 I3 10+23W e_LX(0.5-2.5) Error on LX(0.5-2.5keV) (lower limit) 122-124 A3 --- [HEG2003] Heinke et al. (2003ApJ...590..809H) designation 126-137 A12 --- Notes Notes (1)
Note (1): Notes as follows: V = short-term variability (99% confidence) V? = short-term variability (95% confidence) Y = variability on timescales of years between 2000 and 2003 L = possible transient LMXB EXO 1745-248 q = possible qLMXB q? = possible qLMXB candidate s = possible foreground star MSP = possible radio millisecond pulsar
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 15 A15 --- CXOGlbJ CXOGlbJ name (HHMMSS.s+DDMMSS), CXOGlb JHHMMSS.s+DDMMSS in Simbad 17- 18 I2 h RAh Right ascension (J2000) 20- 21 I2 min RAm Right ascension (J2000) 23- 28 F6.3 s RAs Right ascension (J2000) 30- 34 F5.3 s e_RAs rms uncertainty on RA 36 A1 --- DE- Declination sign (J2000) 37- 38 I2 deg DEd Declination (J2000) 40- 41 I2 arcmin DEm Declination (J2000) 43- 47 F5.2 arcsec DEs Declination (J2000) 49- 52 F4.2 arcsec e_DEs rms uncertainty on DE 54- 59 F6.2 arcsec Dist Distance from the center of Terzan 5 61- 64 F4.1 ct C(0.5-2) Counts in 0.5-2keV band 66- 69 F4.1 ct E_C(0.5-2) Error on C(0.5-2keV) (upper limit) 71- 73 F3.1 ct e_C(0.5-2) Error on C(0.5-2keV) (lower limit) 75- 78 F4.1 ct C(2-6) Counts in 2-6keV band 80- 82 F3.1 ct E_C(2-6) Error on C(2-6keV) (upper limit) 84- 86 F3.1 ct e_C(2-6) Error on C(2-6keV) (lower limit) 88- 91 F4.1 aW/m2 F(0.5-6) X-ray flux in the 0.5-6keV band (1) 93- 96 F4.1 aW/m2 E_F(0.5-6) Error on F(0.5-6keV) (upper limit) 98-101 F4.1 aW/m2 e_F(0.5-6) Error on F(0.5-6keV) (lower limit) 103 A1 --- Notes [c?] Likely optical counterparts (c) or less likely counterparts (?) 104 A1 --- Flag [*] source used to align X-ray positions 106-110 F5.2 mag Bmag ? B magnitude (2) 112-115 F4.1 mag Rmag ? R magnitude (2) 117-121 F5.2 mag Imag ? I magnitude (2)
Note (1): Assuming NH=1.2x1022cm-2 Note (2): Magnitudes are from the USNO-B1.0 digitized sky survey (Monet et al., 2003, Cat. I/284), averaged when two measurements exist; note that there is substantial scatter among these measurements (up to 1mag), presumably due to crowding.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Jul-2008
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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