ACDS V10.0 - Mon Apr 22 09:36:25 CEST 2019
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Detailed Description of CXC/V2 : Chandra Catalog Release View
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Note : this is the description file of the original catalog.
This HTML page corresponds well to the original description, but some minor
changes in the format may have been introduced in the FITS output
files in order to allow for arithmetic operations on quantities
such as coordinates and times. h:m:s and d:m:s units are normally
converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the
units; the value given in the HTML files supersedes the value indicated in the ReadMe
file for this catalogue.
O/3 Extract from CSC 2.0 current database view
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Extract from Chandra Source Catalog Release 2.0 (CSC 2.0) Current Database
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ADC_Keywords: X-ray sources, Cross identifications
Mission_Name: CHANDRA
Description:
The Chandra Source Catalog (CSC) is ultimately intended to be the definitive catalog of X-ray sources
detected by the Chandra X-ray Observatory. To achieve that goal, the catalog will be released to the
user community in a series of increments with increasing capability. The second major release of the
CSC (release 2.0) includes data for roughly 315,000 X-ray sources on the sky extracted from 10,382
Chandra ACIS and HRC-I imaging observations released publicly through the end of 2014.
Users are kindly requested to acknowledge their use of the Chandra Source Catalog in any resulting
publications. http://cxc.harvard.edu/csc2/cite.html
The version operating at Strasbourg Observatory/CDS uses the results of an ADQL query
http://cxc.harvard.edu/csc2/cli/index.html and only lists a subset of all columns available in the
database view.
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 156 . This file
× Catalog 156 . Result
Byte-by-byte Description of file: Catalog
Bytes Format Units Label Explanations
1- 20 A20 --- Name source name in the form "2CXO Jhhmmss.s{+|-}ddmmss"
21- 28 D8.7 deg ra source position, ICRS right ascension
29- 36 D8.7 deg dec source position, ICRS declination
37- 44 D8.7 arcsec errellipser0 major radius of the 95% confidence level position error ellipse
45- 52 D8.7 arcsec errellipser1 minor radius of the 95% confidence level position error ellipse
53- 60 D8.7 arcsec errellipseang position angle (referenced from local true north) of the major axis
61- 68 F8.7 --- significance highest flux significance across all stacked observations and science energy bands
69 I1 --- conf_flag source confused ?
70 I1 --- ext_flag source extended ?
71 I1 --- satsrcflag source saturated in all observations ?
72- 79 E8.2 erg/s*cm2 fluxaperavg_b aperture-corrected net fluxaveraged over all observations
80- 87 E8.2 erg/s*cm2 fluxaperavglolimb 68% lower confidence limit of fluxaperavg
88- 95 E8.2 erg/s*cm2 fluxaperavghilimb 68% upper confidence limit of fluxaperavg
96-103 D8.7 --- hard_hm (2.0-7.0 keV) to (1.2-2.0 keV) hardness ratio
104-111 D8.7 --- hardhmlolim 68% lower confidence limit of hard_hm
112-119 D8.7 --- hardhmhilim 68% upper confidence limit of hard_hm
120-127 D8.7 --- hard_ms (1.2-2.0 keV) to (0.5-1.2 keV) hardness ratio
128-135 D8.7 --- hardmslolim 68% lower confidence limit of hard_ms
136-143 D8.7 --- hardmshilim 68% upper confidence limit of hard_ms
144-147 I4 --- acis_num total number of ACIS imaging observations contributing
148-156 F9.1 --- acis_time total exposure time (seconds of good time)
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