Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/calibration/documentation/epic_cal_meetings/201504/Smith2_Cal_2015.pdf Дата изменения: Wed Apr 8 23:55:00 2015 Дата индексирования: Wed Apr 13 13:32:14 2016 Кодировка: Поисковые слова: equinox

Investigation of the XRT XPSF Wings

Michael Smith, ESAC EPIC Cal Ops Meeting, ESAC, 9-10 April 2015


Post SAS 14.0 CCFs

Bright on-axis source Piled-up

Annular extraction region

Document title | Author Name | Place | Data doc | Programme | Pag. 2


XRT3_XPSF_0016.CCF -> XRT3_XPSF_0014.CCF

Bright on-axis source Piled-up

Annular extraction region

Document title | Author Name | Place | Data doc | Programme | Pag. 3


XRT3_XPSF_0016.CCF

XRT3_XPSF_0016.CCF: - Refinement of the high-energy XRT3 (=PN) PSF - Based on TI mode data (Mkn 421) - Optimise parameters describing PSF wings in order to obtain constant measured flux independent of number of excised columns

Document title | Author Name | Place | Data doc | Programme | Pag. 4


0014 versus 0016 on Imaging Mode Data
Sample of ~ 30 on-axis non-piled-up sources Determine band fluxes of various annular regions (varying inner radius) normalised to those of a circular region.
XRT_XPSF_0014.CCF XRT_XPSF_0016.CCF

10''

Document title | Author Name | Place | Data doc | Programme | Pag. 5


0014 versus 0016 on Imaging Mode Data
Sample of ~ 30 on-axis non-piled-up sources Determine band fluxes of various annular regions (varying inner radius) normalised to those of a circular region.
XRT_XPSF_0014.CCF XRT_XPSF_0016.CCF

15''

Document title | Author Name | Place | Data doc | Programme | Pag. 6


0014 versus 0016 on Imaging Mode Data
Sample of ~ 30 on-axis non-piled-up sources Determine band fluxes of various annular regions (varying inner radius) normalised to those of a circular region.
XRT_XPSF_0014.CCF XRT_XPSF_0016.CCF

20''

Document title | Author Name | Place | Data doc | Programme | Pag. 7


Do MOS XRT PSFs Need Modification?

XRT_XPSF_0016.CCF does what is advertised for PN
Do the MOS XRT PSFs need a similar modification?

Test this, using the same method as used for deriving 0016
But on MOS (and PN) imaging mode data Using a sample of ~ 30 on-axis non-piled-up sources

Document title | Author Name | Place | Data doc | Programme | Pag. 8


Method

Sample PSF parameter space within reasonable limits.

5 PSF parameters(E):
beta2d core radius, r0 beta2d power-law slope, alpha ellipticity, epsilon gauss2d FWHM gauss2d-to-beta2d normalisation

XRT3_XPSF_0016 essentially differed in alpha: 0% at 2keV up to -16% change at 10.5 keV.

Document title | Author Name | Place | Data doc | Programme | Pag. 9


Objective

For each: - alpha parameter value, and - annular inner radius determine the mean band fluxes. Normalise to those of a circular extraction. Determine the parameter value for which the energy dependence of the flux ratios is minimal, considering the set of annular inner radii.

Document title | Author Name | Place | Data doc | Programme | Pag. 10


Results for alpha
PN: ~0%

Document title | Author Name | Place | Data doc | Programme | Pag. 11


Results for alpha
PN: ~0% M1: ~0%

Document title | Author Name | Place | Data doc | Programme | Pag. 12


Results for alpha
PN: ~0% M1: ~0% M2: -10%

Document title | Author Name | Place | Data doc | Programme | Pag. 13