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