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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