DETERMINING THE ABSOLUTE ASTROMETRIC ERROR IN CHANDRA SOURCE CATALOG POSITIONS

作者：Rots Arnold H^*; Budavari Tamas

来源：Astrophysical Journal, The - Supplement Series, 2011, 192(1): 8.

DOI：10.1088/0067-0049/192/1/8

• astrometry
• catalogs
• methods: statistical
• stars: statistics
• X-rays: stars

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 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.

• 出版日期2011-1