Analysis of the soft Analysis of the soft response of pn and MOSresponse of pn and MOS

with a sample of with a sample of blazarsblazars

Silvano Molendi (IASF-MI)Silvano Molendi (IASF-MI)

MotivationMotivation• Evaluate impact of mos Evaluate impact of mos

eff. areas change eff. areas change • This is a major changeThis is a major change

Impact on pn/mos cross calibration Impact on pn/mos cross calibration is possibly largest ever.is possibly largest ever.

Example of old vs new Example of old vs new pn/mospn/mos

Residuals in the form of ratio data/model Residuals in the form of ratio data/model for PN data on MOS best fitting model for PN data on MOS best fitting model

Example of old vs new Example of old vs new pn/mospn/mos

Residuals in the form of ratio data/model Residuals in the form of ratio data/model for PN data on MOS best fitting model for PN data on MOS best fitting model

HowHow• Sample of 21 blazars from XMM-Sample of 21 blazars from XMM-

Newton archiveNewton archive• Featureless objects with simple pow-Featureless objects with simple pow-

law spectralaw spectra• Most have no reported evidence of Most have no reported evidence of

intrinsic absorptionintrinsic absorption• Look at spectral parameters, Look at spectral parameters,

particularly Nparticularly NHH, to evaluate changes , to evaluate changes following changes in MOS arfs.following changes in MOS arfs.

The SampleThe Sample

• All data reduced with SAS 7.1 All data reduced with SAS 7.1 • Emchain & Epchain + soft proton screeningEmchain & Epchain + soft proton screening• some objects piled up (epatplot + reference some objects piled up (epatplot + reference

cr from uhb sec 3.3.2 Tab 3 )cr from uhb sec 3.3.2 Tab 3 )• extraction in annuli (iterative core extraction in annuli (iterative core

extrusion )extrusion )• arfs and rmfs generated using standard arfs and rmfs generated using standard

tools tools • MOS1, MOS2 (pattern 0-12) and pn (0-4) MOS1, MOS2 (pattern 0-12) and pn (0-4) • flag==0 for MOS and pn flag==0 for MOS and pn

The ExerciseThe Exercise

• All data reduced with SAS 7.1 All data reduced with SAS 7.1 • Emchain & Epchain + soft proton screeningEmchain & Epchain + soft proton screening• some objects piled up (epatplot + reference some objects piled up (epatplot + reference

cr from uhb sec 3.3.2 Tab 3 )cr from uhb sec 3.3.2 Tab 3 )• extraction in annuli (iterative core extraction in annuli (iterative core

extrusion )extrusion )• arfs and rmfs generated using standard arfs and rmfs generated using standard

tools tools • MOS1, MOS2 (pattern 0-12) and pn (0-4) MOS1, MOS2 (pattern 0-12) and pn (0-4)

The Exercise/2The Exercise/2

• For mos1 and mos2 generated old arfs For mos1 and mos2 generated old arfs

cifbuild analysisdate followed by arfgencifbuild analysisdate followed by arfgen• Spectra fit in 0.5-10 keV band with Spectra fit in 0.5-10 keV band with

“wabs*pow” model all params free“wabs*pow” model all params free

• Some 60 spectra 100 fitsSome 60 spectra 100 fits

ResultsResults Look at NLook at NHH MOS1 vs MOS2 for old qe MOS1 vs MOS2 for old qe

ResultsResults Look at NLook at NHH MOS1 vs MOS2 for new qe MOS1 vs MOS2 for new qe

Agreement btwn MOS1 & Agreement btwn MOS1 & MOS2 does not changeMOS2 does not change

New vs Old - MOS1 New vs Old - MOS1

New vs Old – MOS2 New vs Old – MOS2

New vs Old – MOS2 New vs Old – MOS2

• Points fall exactly on modelPoints fall exactly on model

• XX22 is less than 1 is less than 1

• Data is the same, only arf is differentData is the same, only arf is different

• The increase in O depth corresponds to an The increase in O depth corresponds to an increase of Nincrease of NHH, assuming standard O , assuming standard O abundances, of 2x10abundances, of 2x102020

New MOS vs PN New MOS vs PN

Very good agreement btwn MOS Very good agreement btwn MOS and PN!and PN!

X-ray vs 21cm NX-ray vs 21cm NHH

• old

• new

X-ray vs 21cm NX-ray vs 21cm NHH Excluded all objects with excised piled-up

core

• old

• new

Very low NVery low NHH objects objects

There are 6/17 objects with NH < 1020

Soft excess ?

Possible for flat spectrum objects, unlikely for steep spectrum objects

Soft excess? Soft excess?

X-ray vs 21cm NH X-ray vs 21cm NH Exclude all objects with excised piled-up

core

Summary Summary

1. New arfs result in smaller NH ~2x1020

2. For the fist time we have good agreement btwn MOS and PN

3. The blazar exercise failed its major goal, it did not help us in establishing which of the two arfs is better.