the timing mode psf richard saxton, maria diaz trigo, matteo guainazzi
DESCRIPTION
The Timing Mode PSF Richard Saxton, Maria Diaz Trigo, Matteo Guainazzi. Columns in Timing mode. Current SAS: Flux per column. Col Constant 0 1.0 1 1.23 1.65 2.15 2.53 3.14 3.78 4.69. Fit to Vela with: Const * wabs * plaw. - PowerPoint PPT PresentationTRANSCRIPT
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
The Timing Mode PSF
Richard Saxton, Maria Diaz Trigo, Matteo Guainazzi
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
Columns in Timing mode
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
Current SAS: Flux per column
Col Constant
0 1.01 1.23 2 1.653 2.154 2.535 3.146 3.787 4.69
Fit to Vela with: Const * wabs * plaw
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
SAS 8 arfgen - GX 339+4 (1000 c/s)
All columnsAll – col 0All – col-1 to col+1All – col-2 to col+2All – col-3 to col+3All – col-4 to col+4
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
SAS 8 arfgen - 1254 (600 c/s)
1254
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
SAS 8: Add up annular contriutions
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
New arfgen method: Integrate the PSF image
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
Integrated PSF image technique
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
Integrated PSF image technique
Flux in inner 9 cols / flux in cols -4 to -2 and +2 to +4
-10%
+10%
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
Practical spectral fitting effects
Spectrum
NH=2.3E+22Gauss = 6.44 keV 1.04 keV 0.02Disk_T = 2.26Bbod_T = 1.06
Tbabs (gauss*diskbb*bbod)
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
Practical spectral fitting effects Original Spectrum
NH=2.3E+22Gauss = 6.44 keV 1.04 keVDisk_T = 2.26Bbod_T = 1.06
* Linear ramp
NH=2.32E+22Gauss = 6.42±0.04 1.06±0.04Disk_T = 2.40±0.09
* Ramp with extra at 6keV
NH=2.34E+22Gauss = 6.55±0.03 0.99±0.04Disk_T = 2.34±0.09
IgnoreInner 3 cols
IgnoreInner 5 cols
+15%
-10%
+10%
-10%
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
MKN 421 simple power-law test
Excluding inner 3 columnsgives a 15% decrease in measuredflux. Slope is stable.
XMMEPICSOC
Richard SaxtonBackground, Operations & Calibration (BOC) meeting
Mallorca, 30/03/09-01/04/09
Conclusions
Major problem with ARF in SAS 8 when inner columns are excluded in timing mode observations. New image integration technique fixes this Residual problem at 15% level in flux if inner 3 cols excluded Spectral parameters reasonably consistent so looking acceptable…