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J/ApJ/669/765       Chandra X-ray sources in LALA Cetus field     (Wang+, 2007)

Chandra X-ray sources in the LALA Cetus field. Wang J.X., Zheng Z.Y., Malhotra S., Finkelstein S.L., Rhoads J.E., Norman C.A., Heckman T.M. <Astrophys. J., 669, 765-775 (2007)> =2007ApJ...669..765W
ADC_Keywords: X-ray sources ; Surveys ; Magnitudes Keywords: catalogs - galaxies: active - galaxies: high-redshift - X-rays: diffuse background - X-rays: galaxies Abstract: The 174ks Chandra Advanced CCD Imaging Spectrometer exposure of the Large Area Lyman Alpha Survey (LALA) Cetus field is the second of the two deep Chandra images on LALA fields. In this paper we present the Chandra X-ray sources detected in the Cetus field, along with an analysis of X-ray source counts, stacked X-ray spectrum, and optical identifications. A total of 188 X-ray sources were detected: 174 in the 0.5-7.0keV band, 154 in the 0.5-2.0keV band, and 113 in the 2.0-7.0keV band. The X-ray source counts were derived and compared with LALA field (172ks exposure). Description: A total of 176ks of Chandra ACIS exposure on the LALA Cetus field was obtained in very faint (VFAINT) mode, composed of two individual observations. The first observation, with 160.4ks exposure, was taken on UT 2002 June 13-14 (Chandra ObsID 4129). The second observation, with 15.4ks exposure, was taken 1 day later (UT 2002 June 15, ObsID 4402). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 162 188 Chandra sources in LALA Cetus field
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) J/AJ/127/213 : LALA Bootes field X-ray source catalog (Wang+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [WZM2007] Sequential number 5- 22 A18 --- CXOLALA2 CXOLALA2 designation (JHHMMSS.s+DDMMSS.s) 23 A1 --- m_CXOLALA2 [X] Multiplicity index on CXOLALA2 24- 25 I2 h RAh Right ascension (J2000) (1) 27- 28 I2 min RAm Right ascension (J2000) (1) 30- 33 F4.1 s RAs Right ascension (J2000) (1) 35 A1 --- DE- Declination sign (J2000) (1) 36- 37 I2 deg DEd Declination (J2000) (1) 39- 40 I2 arcmin DEm Declination (J2000) (1) 42- 45 F4.1 arcsec DEs Declination (J2000) (1) 47- 50 F4.2 arcsec ePos 3σ uncertainties of the centroid positions directly given by WAVDETECT 52- 56 F5.1 ct Tcts Total band (0.5-10keV) net counts 58- 61 F4.1 ct E_Tcts Error on Tcts (upper limit) 63- 66 F4.1 ct e_Tcts Error on Tcts (lower limit) 68- 72 F5.1 ct Scts Soft band (0.5-2keV) net counts 74- 77 F4.1 ct E_Scts Error on Scts (upper limit) 79- 82 F4.1 ct e_Scts Error on Scts (lower limit) 84- 88 F5.1 ct Hcts Hard band (2-10keV) net counts 90- 93 F4.1 ct E_Hcts Error on Hcts (upper limit) 95- 98 F4.1 ct e_Hcts Error on HCts (lower limit) 100-102 A3 --- Det [TSH ] Band detections (2) 104-108 F5.2 --- HR Hardness ratio (HR=(H-S)/(H+S)) (3) 110-113 F4.2 --- E_HR Error on HR (upper limit) 115-118 F4.2 --- e_HR Error on HR (lower limit) 120-124 F5.2 aW/m2 S0.5-10 Flux density in total band (0.5-10keV) (4) 126 A1 --- l_S0.5-2 Limit flag on S0.5-2 127-131 F5.2 aW/m2 S0.5-2 Flux density in soft band (0.5-2keV) (4) 133 A1 --- l_S2-10 Limit flag on S2-10 134-138 F5.2 aW/m2 S2-10 Flux density in hard band (2-10keV) (4) 140-143 F4.1 arcsec oRA ?=- Offset in right ascension of the detected optical counterpart (RAO-RAX) 145-148 F4.1 arcsec oDE ?=- Offset in declination of the detected optical counterpart (DEO-DEX) 150 A1 --- l_r'mag Limit flag on r 151-155 F5.2 mag r'mag ? r'-band AUTO magnitude from SExtractor (5) 157-160 F4.2 mag e_r'mag ? rms uncertainty on r'mag 162 A1 --- n_r'mag Note on r'mag (6)
Note (1): Whenever available, source coordinates derived in the soft-band image, which has the best spatial resolution among the three bands, are presented. For sources not detected in the soft band, total (with a higher priority) or hard-band positions are used as substitutions. Note (2): Multiple letters are used for sources detected in more than one band, where bands are: T = source detected in total band S = source detected in soft band H = source detected in hard band Note (3): Here we calculate the hardness ratios with a Bayesian approach which models the detected counts as a Poisson distribution and can give reliable error bars for both low and high count sources. Note (4): Galactic-absorption-corrected, NH=2.2x1020cm-2. In 10-15erg/cm2/s = 10-18W/m2 Note (5): Kron-like elliptical aperture magnitudes, Bertin & Arnouts (1996A&AS..117..393B). For sources which are not detected in r' band, 5σ upper limits of the magnitudes are given when available. Note (6): Notes as follows: b = Sources with the searching circles seriously overlapped by nearby bright sources and no optical counterparts can be visually identified. Reliable upper limits on their r'-band magnitudes are thus not available c = Sources with optical counterparts visually identified. SExtractor failed to detect these counterparts due to dilution of nearby bright sources. For these counterparts, their r'-band magnitudes are measured within a 1.5" radius circle. d = Two Sources which are not covered by the MMT r'-band image e = Sources with two counterparts identified within the searching circles. Here we only present the one which is closer to the center of the circles
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Jan-2010
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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