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J/ApJ/611/821            A2125 in X-ray                           (Wang+, 2004)

X-raying A2125: a large-scale hierarchical complex of galaxies and hot gas. Wang Q.D., Owen F., Ledlow M. <Astrophys. J., 611, 821-834 (2004)> =2004ApJ...611..821W
ADC_Keywords: Clusters, galaxy ; X-ray sources Mission_Name: Chandra Keywords: cosmology: observations - galaxies: clusters: individual (A2125) - galaxies: evolution - galaxies: general - X-rays: galaxies - X-rays: galaxies: clusters Abstract: We present an 82ks Chandra ACIS-I observation of a large-scale hierarchical complex, which consists of various clusters/groups of galaxies and low surface brightness X-ray emission at z=0.247. This high-resolution Chandra observation allows us for the first time to separate unambiguously the X-ray contributions from discrete sources and large-scale diffuse hot gas. We detect 99 X-ray sources in a 17{arcmin}x17{arcmin} field. Description: The Chandra observation of A2125 (obs. ID 2207) was taken on 2001 August 24, for an exposure of 81.6ks. The instrument ACIS-I was at the focal plane of the telescope and in the "VERY FAINT" mode. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 98 99 Chandra Source List
See also: B/chandra : The Chandra Archive Log (CXC, 2002-) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [WOL2004] Sequential running number 5- 23 A19 --- CXOU CXOU designation ( 26- 28 F3.1 arcsec e_pos Position uncertainty (1σ) 31- 35 F5.1 --- logP False detection probability (1) 38- 42 F5.2 ct/ks CR On-axis (exposure-corrected) source count rate in the 0.5-8keV band 45- 48 F4.2 ct/ks e_CR Uncertainty in CR 51- 55 F5.2 --- HR ? Hardness ratio, HR=(H-S)/(H+S) (2) 58- 61 F4.2 --- e_HR ? Uncertainty in HR 63- 67 F5.2 --- HR1 ? Hardness ratio 1, HR1=(S2-S1)/S (2) 70- 73 F4.2 --- e_HR1 ? Uncertainty in HR1 76- 80 F5.2 --- HR2 ? Hardness ratio 2, HR2=(H2-H1)/H (2) 83- 86 F4.2 --- e_HR2 ? Uncertainty in HR2 89- 98 A10 --- Note Band of detection and correspondance (3)
Note (1): The false detection probability P that the detected number of counts may result from the Poisson fluctuation of the local background within the detection aperture [log(P) smaller than -20.0 is set to -20.0]. Note (2): The hardness ratios defined as HR=(H-S)/(H+S), HR1=(S2-S1)/S, and HR2=(H2-H1)/H, where the net source count rates are: S1 in the 0.5-1keV band, S2 in the 1-2keV band, H1 in the 2-4keV, and H2 in the 4-8keV band, and S=S1+S2 and H=H1+H2. The hardness ratios are calculated only for sources with individual signal-to-noise ratios greater than 4 in the broad band (B=S+H), and only the values with uncertainties less than 0.2 are included. Note (3): The labels "B," "S," or "H" mark the band in which a source is detected (broad-band B=S=H, Soft or Hard); the detection with the most accurate position, as adopted in CXOU, is marked first. The label "r" and "o" denote the identification as the A2125 complex member galaxies in radio and optical.
History: From electronic version of the journal
(End) Marianne Brouty [CDS] 06-Apr-2005
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