XMM-Newton SAS: Watchout Page

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XMM-Newton SAS: Watchout Page RGS spectrum of HR1099

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Software requirements

Does `BACKSCAL` take into account all the "blank areas" in a spectrum extraction region?

EPIC X-ray spectra are expressed in counts per spectral channel. Spectral fitting programs such as XSPEC apply the proper renormalization to the background spectra, using the value of the BACKSCAL keyword in the header of the spectral file(s). The SAS task backscale calculates the BACKSCAL value. backscale is automatically run, when a spectrum is extracted via xmmselect.

Users must be aware that the current implementation of backscale employs the full area of the spectrum extraction region, save the (known) bad pixels/columns. Other effects, such as:

the edge of the field of view
windowing selections, e.g. the reduced central CCD area in small window mode
any CCD selection used while extracting the spectrum, e.g. CCDNR==1

are also taken into account.

Pages maintained by SAS librarian.
Any question about SAS should be addressed to the XMM-Newton help desk.
Updated on: November 18, 2006

Does BACKSCAL take into account all the "blank areas" in a spectrum extraction region?

Does `BACKSCAL` take into account all the "blank areas" in a spectrum extraction region?