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
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