XIS Blank Sky Background Files: Cycle 3 Versions
Note added on Nov. 27
The blank sky background files released here are based on the data with
a relatively short exposure of 96 ks. Those who want to simulate spectra
for a longer exposure than 100 ks should use
the night earth background
files and add the CXB and Galactic diffuse background as model componets.
The XIS team has released a set of blank sky background files suitable for the preparation of AO-3 proposals.
The spectral files have been created from the Lockman Hole observations on May 3, 2007. The aim point of the observation was RA = 162.9375, Dec = 57.26667.
The spectra were extracted from a circular region of a radius of 6 mm centered at the XIS/HXD nominal positions. Because the unit of the BACKSCAL keyword changes with the coordinate system, spectra were created for both the DET and SKY coordinates. Two spectra, one for the BI sensor (XIS1) and the other for the sum of FI sensors (XIS0,3), have been extracted for each coordinate system and for each extraction region. Net exposures are 96.1 ks for both of FI and BI sensors.
This release consists of the following 8 files.
- XIS nominal position (r=6mm):
- Sky Coordinates
- LH_xisnom6mm_sky_bi.pi (XIS1)
- LH_xisnom6mm_sky_fi.pi (Sum of XIS0,3)
- Detector Coordinates
- LH_xisnom6mm_det_bi.pi (XIS1)
- LH_xisnom6mm_det_fi.pi (Sum of XIS0,3)
- Sky Coordinates
- HXD nominal position (r=6mm):
- Sky Coordinates
- LH_hxdnom6mm_sky_bi.pi (XIS1)
- LH_hxdnom6mm_sky_fi.pi (Sum of XIS0,3)
- Detector Coordinates
- LH_hxdnom6mm_det_bi.pi (XIS1)
- LH_hxdnom6mm_det_fi.pi (Sum of XIS0,3)
- Sky Coordinates
These (either the sky or detector coordinate versions) are suitable for simulation purposes. Use with a matching set of RMF and ARF files.
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