Determining the Absolute Astrometric Error in Chandra Source Catalog Positions

Details Determining the Absolute Astrometric Error in Chandra Source Catalog Positions Determining the Absolute Astrometric Error in Chandra Source Catalog Positions

2010-11-24

arxiv.org/abs/1011.5401v1

ApJS 192, 8 (2011)

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

18 pages, 6 figures, accepted for publication in ApJSuppl

Scientific paper

10.1088/0067-0049/192/1/8

Although relative errors can readily be calculated, the absolute astrometric accuracy of the source positions in the Chandra Source Catalog (CSC), Version 1.0, is a priori unknown. However, the cross-match with stellar objects from the Sloan Digital Sky Survey (SDSS) offers the opportunity to compare the apparent separations of the cross-matched pairs with the formally calculated errors. The analysis of these data allowed us to derive a value of 0.16" for the residual absolute astrometric error in CSC positions. This error will be added to the published position errors in the CSC from now on, starting with CSC, Version 1.1.

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