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Дата изменения: Thu Mar 18 23:16:02 2004
Дата индексирования: Sat Dec 22 08:11:01 2007
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XMM-Newton Science Analysis System


region (region-7.1.5) [xmmsas_20040318_1831-6.0.0]

Meta Index / Home Page

Input Files

1. A source list, which at minimum must contain a table extension named SRCLIST with the following columns:
   • (mandatory) RA: right ascension of the source in decimal degrees.
   • (mandatory) DEC: declination of the source in decimal degrees.
   • (mandatory) SCTS: total source counts.
   • (mandatory) BG_MAP: total background counts per pixel.
   • (mandatory) ID_INST: integer id of the EPIC instrument.
   • (mandatory) ID_BAND: integer id of the energy band.
   • (optional) a further column, specified by srcidcol, which should contain a unique source identifying integer. Note that region only attempts to access this column if operationstyle=`batch'.

   If radiusstyle=`contour', the source list should also contain WCS keywords so as to enable one to convert the flux-per-pixel background values to flux-per-arcsec. XMM EPIC source lists currently store these in a slightly non-standard way, as keywords in the table header, instead of as image-position column keywords. Since the major grist to region's mill is EPIC source lists, the task has been `hard-wired' to look for these header keywords. These keywords are described as follows:

   • TCTYPEn: ='RA--TAN' for n=1 and 'DEC-TAN' for n=2.
   • TCRPIXn: the position in pixel units of the reference point.
   • TCRVALn: the position in world (ie, RA or dec) units of the reference direction.
   • TCDELTn: the size of the pixels in world (ie, RA or dec) units. Note that for RA/dec as world units, the n=1 pixel size is usually made negative, so that RA increases to the left.
   • TCROTA2: the rotation angle of the world frame. Usually this rotation is zero and in this case the keyword can be omitted.

   `n' in the above should run from 1 to 2.

   I realize that this is a very narrow and restrictive source-list format definition. In future it is hoped to be able to make region accept much more generic lists of sources.

2. An XMM EPIC event list against which the region filter will be applied.