Post on 11-Jan-2016
description
Astrometry and EPIC flux Astrometry and EPIC flux cross-calibration in cross-calibration in
2XMMp/2XMM 2XMMp/2XMM
Silvia MateosR. Saxton, S. Sembay and the XMM-Newton Survey Science Centre
2XMMp astrometry2XMMp astrometry
SDSS-DR5 spectroscopic BLAGN sample (~600 objects)
SDSS-DR5 statistically identified BLAGN blue & stellar
fx/fopt> -1
syserr=0.3
syserr=0.3
Statistical evaluation of 2XMMp/2XMM fluxesStatistical evaluation of 2XMMp/2XMM fluxes
2XMMp (and 2XMM) ECFs obtained with • spectral model : =1.7 & NH=3x1020 cm-2
• One set of M1/M2 rmfs (from rev 534)
Selected good quality sources• >250 cts per camera and energy bad
(avoid Eddington bias)• fluxes<6x10-12 erg cm-2 s-1 per camera and energy
band (avoid pile up effects)Evaluation of EPIC flux cross-calibration from observed Evaluation of EPIC flux cross-calibration from observed
distributions of flux differences (normalised) between distributions of flux differences (normalised) between camerascameras
• for each energy bandfor each energy band• different M1 off-axis angledifferent M1 off-axis angle• revolution (time dependence)revolution (time dependence)
M2-M1M2-M1E1 E2
E3 E4
M2-M1M2-M1
E5
Flux calibration differences between M1 and M2cameras <5% level in all energy bands
E1 E2
E3 E4
pn-M1pn-M1
E5
pn-M1pn-M1
pn-MOS flux differences ≤10% for energy bands 1-4 and ≤15% for energy band 5
on-axis: <5 arcmin (~M1 central chip)on-axis: <5 arcmin (~M1 central chip)off-axis: >5 arcminoff-axis: >5 arcmin
pn-M1pn-M1 M2-M1M2-M1
pn-M1pn-M1 M2-M1M2-M1
pn-M1pn-M1 M2-M1M2-M1
29-25029-250 250-750 >75029-25029-250 250-750 >750
Time dependence of 2XMMp/2XMM flux cross-calibration
Small dependence with time of EPIC flux cross-calibrationLargest differences observed for M2-M1 energy band 1 (0.2-0.5 keV)
Summary
• Statistical analysis of EPIC flux cross-calibration in agreement with results from bright calibration objects– M2-M1 flux differences ≤5% for all energy bands– pn-MOS differences ≤10% for energy bands 1-4 and
≤15% for energy band 5 (4.5-12 keV)
• See dependence of EPIC flux cross-calibration with off-axis sources
• Small time dependence of EPIC flux cross-calibration– except for M2-M1 energy band 1
pn-M1pn-M1
pn-M1pn-M1