Chandra Calibration StatusChandra Calibration Status

CUC Meeting Oct. 13, 2011CUC Meeting Oct. 13, 2011

Chandra Calibration StatusChandra Calibration Status

Calibration updates since the 2010 CUC meeting

Internal Chandra cross-calibration status

Current calibration issues

ACIS temperature-dependent gain correction software for timed-event (TE) mode data was released in CIAO 4.4.1 on Dec. 15, 2010.

ACIS cti-correction software for TE data in graded (G) telemetry mode was released in CIAO 4.3

A new contamination model for the ACIS-I was released in CALDB 4.4.1

Time-dependent gain corrections for epochs 43-46 ( Aug 2010 – July 2011)

Recent Calibration Products and Software Releases

ACIS

HRC

An update to the HRC-I QE to improve cross-calibration between HRC-I/HRC-S/ACIS-S was released in CALDB 4.4.1

HRC-I gain map for 2010 was released in CALDB 4.4.1

HRC-S rmf (using SAMP) was released in CALDB 4.4.1

A series of time-dependent HRC-S QE maps (one for each year) were released in CALDB 4.4.5 (June 30, 2011)

Recent Calibration Products or Software Releases

Updated extraction regions and the clocking angle for dispersed LETG/ACIS-S spectra were released in CALDB 4.1.1

Revised LETG transmission efficiencies for orders m=2-10 were released in CALDB 4.4.3 (April 26, 2011)

Recent Calibration Products or Software Releases

LETG

Internal Chandra Cross-Calibration Internal Chandra Cross-Calibration

Calibration products derived from ground-based data.

Calibration products derived in-flight data and internal cross-calibration

HRMA effective area

ACIS-S and ACIS-I QE

LETG first order efficiency

MEG first order efficiency for E<1 keV

HEG first order efficiency for E>1 keV

Shape of HRC QE

HRC-I and HRC-S QE

LETG higher order efficiencies

ACIS contamination model

MEG first order efficiency for E>1keV

HEG first order efficiency for E<1keV

Internal Chandra Cross-Calibration Internal Chandra Cross-Calibration

Bare ACIS-S/ACIS-I cross-calibration

Abell 1795

phabs*apec

0.5-7.0 keV

Temperature Abundance

Flux

5%

3%

Bare ACIS-S/ACIS-I cross-calibration

G21.5-09

phabs*pow

s=1.84

=1.78

Power-law index

Flux

Column density

Filled symbols – full-frame

Open symbols – sub-array

NHS=3.07

NHI=2.91

Bare HRC-I/HRC-S/ACIS-S cross-calibration

G21.5-09

3%

Mirror Vignetting and ACIS QE MAP

Abell 1795

ACIS-I3

X aim point

read-out

AC

IS-S

Current ACIS Calibration Issues

ACIS-I3

X

ACIS contamination model

Simultaneous two-temperature fit to 13108, 13112 and 13113

ACIS contamination model

Simultaneous two-temperature fit to 13108 and 13111

13108 and 13109

ACIS Detector

Spectral fit to the July 2011 LETG/ACIS-S observation of Mkn 421

Time-dependent ACIS QE

ACIS-S3

Time-dependent ACIS QE

ACIS-I3

Solution – a set of time sorted QEU maps

ACIS-S1 Gain

E0102-72 observations on S1 node 2

ACIS-S1 Gain

Near default LETG/ACIS-S configuration

E0102-72

Feature near the Si-K edge in bright sources

Cyg X-2

TE Mode

CC Mode

CC-F mode calibration

Required products for CC-F mode calibration

Trap maps for CC mode data - done

Gain tables for CC mode data – done

QE tables for CC mode data

After Dec. 2009 – done

Before Dec. 2009 – being worked

Current LETG/HRC-S Calibration Issues

Result of current grey correction – broad band flux

HRC-S energy-dependent QE loss

HRC-S Gain throughout the Chandra mission

Stability of the HRC-I QE

Current HETG Calibration Issues

Sample of about 30 HETG/ACIS-S AGN observations

CALDB CALDB version

Correction to HEG/MEG First Order Transmission Efficiency

LEG/MEG/HEG Cross-Calibration

Current Imaging Issues

Dithered SAOTrace simulation of an HRC-I observation of AR Lac

HRC-I intrinsic spatial response

Raw Gaussian Gaussian plus Lorentzian

Summary of Present Calibration ActivitiesSummary of Present Calibration Activities

Release CC- F mode calibration products

Release MEG/HEG first order transmission correction

Release updated ACIS contamination model

Investigate low energy HRC-S QE losses

Investigate Si-K edge feature in ACIS data of very bright sources

Improve the low energy gain calibration of S1

Incorporate dithered SAOTrace rays and updated HRC-I spatial response into MARX

Revise SAOTrace to produce better agreement between the raytrace simulations and the observed power in the wings of the PSF