Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21742503g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #425.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We consider the absolute astrometry requirements for the International X-ray Observatory. These are not to be confused with the requirements for image reconstruction. Some IXO observations will require accurate measurements of the positions of faint x-ray sources to enable high-confidence identifications of counterparts in other wavebands. A common example is identifying the optical or IR counterpart to a distant AGN which is found in an IXO deep or medium deep field. One needs an accurately-determined X-ray determined position in order to find the optical counterpart in a possibly crowed field. A common way to increase the astrometric accuracy of x-ray images is to register the x-ray image to an optical (or IR) frame using a set of previously known optical counterparts. This can be done with Chandra images with up to 0.1 arcsec astrometric accuracy. However this has been done only on selected fields which have been studied in depth at multiple wavebands. Can this technique be used in general, in any field? If so, how many matched objects with what astrometric accuracy is required for a given requirement of absolute astrometric accuracy? Once the registration is complete, what accuracy results? Once large catalogs of AGN are available, from for example eROSITA, we estimate that 5 objects whose IXO measured positions are good to 3 arcsec will be sufficient to register the x-ray image to ≪ 1 arcsec accuracy.
Bookbinder Jay
Garcia Michael R.
Green Paul
Smith Rachel
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