Response files
Baseline
The HEX-P baseline has two high energy telescopes (HET) and one low energy telescope (LET).
HET
The detector responses of the HET are based on NuSTAR detectors, and the mirror effective area has been optimized with a Ni/C multilayer coating. The background is modified from NuSTAR and reduced to the anticipated level.
The extraction region size for source and background is radius = 10 arc seconds. This contains 80% of source photons from a Voigt profile with an HPD = 5 arc seconds.
In addition to a PSF correction of 80% the effective area also includes MLI and Be.
There is the option to simulate each of the HET separately or together, as well as with or without the PSF correction.
v01
This version of the effective area does not include obscuration from structures in the mirror.
v03
This version includes 20% obscuration from structures in the optics, and we have calculated a Field of View averaged effective area across 0-5 arcmin for use with extended sources.
v04
In this version the coating has been changed from Ni/C to Pt/C, which only affect the area above 80 keV. The CsI background lines have been removed in the background files. The detector efficiency has been moved out of the RMF and into the ARFs.
Single HET Telescope
| Release Date | Version | HET ARF | HET FoV ARF | HET RMF | HET BKG |
|---|---|---|---|---|---|
| 13-June-2022 | v01 | HEXP_HET_PSFcor_v01.arf | HEXP_HET_v01.rmf | HEXP_HET_bkg_5arcsec_v01.fits | |
| 30-September-2022 | v03 | HEXP_HET_v03_PSFcor.arf | HEXP_HET_v03_FoVavg.arf | HEXP_HET_v03.rmf | HEXP_HET_v03_LEO_10arcsec.bkg |
| 21-November-2022 | v04 | HEXP_HET_v04_PSFcor.arf | HEXP_HET_v04_FoVavg.arf | HEXP_HET_v04.rmf | HEXP_HET_v04_LEO_10arcsec.bkg |
Two HET Telescopes
| Release Date | Version | HET 2x ARF | HET RMF | HET 2x BKG |
|---|---|---|---|---|
| 13-June-2022 | v01 | HEXP_HET_2x_PSFcor_v01.arf | HEXP_HET_v01.rmf | HEXP_HET_2x_bkg_5arcsec_v01.fits |
| 30-September-2022 | v03 | HEXP_HET_v03_x2.arf | HEXP_HET_v03.rmf | HEXP_HET_v03_x2_LEO_10arcsec.bkg |
| 21-November-2022 | v04 | HEXP_HET_v04_x2.arf | HEXP_HET_v04.rmf | HEXP_HET_v04_x2_LEO_10arcsec.bkg |
LET
As for HET, the source and background extraction radius = 10 arc seconds, and the area is PSF corrected for 80% of the photons. There is also an option of not including the PSF correction.
v01: XRT RMF
The detector response of the LET has been adapted from Swift/XRT and has an energy range from 0.1 to 10.24 keV. The background has also been taken from XRT PC mode and the level currently remains unchanged from XRT.
These files do not contain Be, which is specific for CZT detectors, and MLI (for thermal protection of the optic) has not been included as yet.
v02: eROSITA pnCCD RMF
The v02 detector response is based on the eROSITA pnCCD detector, and the background is scaled from the XMM pn instrument to the HEX-P plate scale, which without additional scaling produces the HEO background. The LEO background level is 7 times smaller than the HEO and has the same shape as the HEO. Instrument lines have been removed, but will be added again with we have more details.
v03: WFI Athena RMF
In this version the detector response is based on the Athena WFI detector, extended up to 25 keV.
For the effective area, this version includes 20% obscuration from structures in the optics, and we have calculated a Field of View averaged effective area across 0-5 arcmin for use with extended sources.
v04: Effective Area update
The QE was not properly included in v03.
| Release Date | Version | LET ARF | LET ARF FoV averaged | LET RMF | LET BKG |
|---|---|---|---|---|---|
| 13-June-2022 | v01 | HEXP_LET_PSFcor_v01.arf | HEXP_LET_v01.rmf | HEXP_LET_bkg_5arcsec_v01.fits | |
| 13-September-2022 | v02 | HEXP_LET_PSFcor_v02.arf | HEXP_LET_v02.rmf | HEXP_LET_HEO_bkg_5arcsec_v02.fits HEXP_LET_LEO_bkg_5arcsec_v02.fits |
|
| 30-Septermber-2022 | v03 | HEXP_LET_v03_PSFcor.arf | HEXP_LET_v03_FoVavg.arf | HEXP_LET_v03.rmf | HEXP_LET_v03_HEO_bkg_10arcsec.bkg HEXP_LET_v03_LEO_bkg_10arcsec.bkg |
| 21-November-2022 | v04 | HEXP_LET_v04_PSFcor.arf | HEXP_LET_v04_FoVavg.arf | HEXP_LET_v04.rmf | HEXP_LET_v04_HEO_bkg_10arcsec.bkg HEXP_LET_v04_LEO_bkg_10arcsec.bkg |
Older versions
Effective Area
Point Spread Function
We are for now assuming that both LET and HET have the same PSF, and that it follows a Voigt function. For such a function scaled to have a HPD of 5 arcsec (or radius of 2.5 arcsec), the extraction radius that contains 75%, 80%, and 90% of the PSF is:
50% psf = 2.5 arcsec
75% psf = 6.5 arcsec
80% psf = 10 arcsec
90% psf = 17 arcsec
In the above we have used 10 arcsec for 80% of the PSF.