Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/5.4.1/doc/region/node4.html
Дата изменения: Fri Jan 10 22:46:38 2003
Дата индексирования: Sat Dec 22 07:40:45 2007
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Поисковые слова: orion nebula

XMM-Newton Science Analysis System


region (region-6.2.2) [xmmsas_20030110_1802-5.4.1]

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Parameters

This section documents the parameters recognized by this task (if any).

Parameter	Mand	Type	Default	Constraints
eventset	yes	string
Reference event file used to define the coordinate system for the source and background regions. In general this will be the event list to be filtered through the regions.
sourcelisttable	yes	string
Table containing source positions.
sourceid	no	integer		$0<$ sourceid $\leq$ number of sources in list
Index (row number) of the source in the source list for which the region descriptions are extracted (``local'' mode only, when using source list table). (NB. This is not related to the SRC_ID column in XMM source lists).
operationmode	no	string	local	``local'' or ``global''
Mode switch, placing the task in ``local'' or ``global'' mode. In ``local'' mode the source and background regions for a single source are extracted; in ``global'' mode the source region encompasses all point sources, and the background region is the whole field-of-view with point sources removed.
regionfile	no	string
Name of source extraction region output file.
bkgregionfile	no	string
Name of background (off-source) extraction region output file.
radiusmode	no	string	fixed	``fixed''
Mode for determining initial source extraction radius. Currently only ``fixed'' is supported, in future an enclosed energy fraction, surface brightness criterion or ``sigma'' width will be added.
radius	no	real		12.0
Source radius (in arcseconds) when using ``fixed'' radius mode.
energyfraction	no	real		0.90
Encircled energy fraction when using ``enfrac'' radius mode.
extractionmode	no	string		``local'' or ``coaxial''
Method used to determine background region for a source. In ``local'' mode the background region is an annulus centred on the source with the inner and outer radii defined as one and three times the original source extraction radius. In ``coaxial'' mode the background region is an annulus centred on the pointing position with inner and outer radii defined as the source off-axis angle plus/minus the original source extraction radius.
Parameter	Mand	Type	Default	Constraints