chandra calibration status
DESCRIPTION
Chandra Calibration Status. CUC Meeting Oct. 10, 2012. Timetable for detector QE and gain updates Calibration updates since the 2011 CUC meeting Cross-calibration results On-going calibration activities Calibration plans for the upcoming year. Chandra Calibration Status. - PowerPoint PPT PresentationTRANSCRIPT
Chandra Calibration StatusChandra Calibration Status
CUC Meeting Oct. 10, 2012CUC Meeting Oct. 10, 2012
Chandra Calibration StatusChandra Calibration Status
Timetable for detector QE and gain updates
Calibration updates since the 2011 CUC meeting
Cross-calibration results
On-going calibration activities
Calibration plans for the upcoming year
Timetable for Detector Gain and QE Updates
Detector Gain Updates QEU updates at present
QEU updates by Dec. 2012
ACIS-S Quarterly None Yearly
ACIS-I Quarterly None Yearly
HRC-I Yearly None None
HRC-S Yearly Yearly Yearly
An updated ACIS contamination model (CALDB 4.4.1 - May 30, 2012)
Time-dependent gain corrections for epochs 47-50 ( Aug 2011 – July 2012)
Calibration products released over the past year
ACIS
HRC
HRC-I gain map for 2011 (CALDB 4.4.7 - Dec. 15, 2011) HRC background spectra for 2011 (CALDB 4.4.7 – Dec. 15, 2011) Updated low energy HRC-S QE (CALDB 4.4.7 – Dec. 15, 2011) Updated HRC-I and HRC-S de-gap maps (CALDB 4.5.0 – Jun. 6,
2012) HRC-S gain map for new HV setting (CALDB 4.5.1 – Jul. 24, 2012)
HETG
Updated HEG and MEG first order transmission efficiencies (CALDB 4.4.6.1 – Dec. 1, 2012)
ACIS Contamination Model N007ACIS Contamination Model N007
Updated time-dependence
(700 eV)
Black data points are ECS measurements and red and blue data points are ACIS-I and ACIS-S observations of A1795
ACIS Contamination Model N007ACIS Contamination Model N007
Updated spatial distribution model
(center to edge)
Cross-calibration with E0102Cross-calibration with E0102
O VIIO VIIINe IXNe X
MEG and HEG first order transmission efficiencyMEG and HEG first order transmission efficiency
Simultaneous fit to 30 blazars
HEG/MEG first order transmission efficiency (Capella)
Old CALDB
Old CALDB
Current CALDB
Current CALDB
July 2012 observations of Mkn 421July 2012 observations of Mkn 421
HETG/ACIS-S LETG/ACIS-S
Planned AO-14 Calibration ObservationsPlanned AO-14 Calibration Observations
Adjustment to low energy
HRC-S QE
QE adjustment was based on the latest non-LTE pure H model atmospheres for HZ43 and Sirius B from the Tubingen group
Fits to co-added HZ spectra
LETG/HRC-S Zeroth Order Image Distortion
0.625” radius circle
CRSV98+99 CRSV100
Updated HRC-S De-Gap Map
LETG/HRC-S observations of HZ43 over the course of the mission
New HV
New HV
Current Calibration Projects
HRC-S High Voltage Test - Jan. 2012
LETG/HRC-S observations of HZ43
LETG/HRC-S observations of HZ43 over the course of the mission
New HV
New HV
Current Calibration Projects
LETG/HRC-S observations of Mkn 421 with old and new HV settings
LETG/HRC-S observations of Mkn 421 with old and new HV settings
New Time-Dependent ACIS QE Maps
ACIS-S3ACIS-I3
Stability of HRC-I QE
G21.5-09HZ43
2.6 ± 0.8 % yr-1
Gain Calibration – ACIS-S1
ACIS Background
SAOTrace New Features – New Scattering Model
10’
Summary of Present Calibration ActivitiesSummary of Present Calibration Activities
Release HRC-S QE for new HV setting
Release updated gain tables and OSIP files for ACIS BI chips
Release a set of time-dependent ACIS QE maps
Release Epoch F ACIS blank sky background images
Short term:
Longer term:
ACIS
Continue to improve the contamination model
How variable is the charged particle background spectrum
Further cross-calibration studies
Improve the calibration of the intrinsic spatial response of the HRC (e.g., (two gaussians plus a Lorentzian)
Monitor the decline in the gain and QE of the HRC-I and determine if a time-dependent QE is required
Further cross-calibration studies
Update HRC-I QE map
HRC
HETG
Develop a science thread for the analysis of HETG/ACIS-S CC-mode data
Revisit cross-calibration between LETG and HETG at short wavelengths with the new HEG and MEG first order efficiencies.
Revisit C-K fine edge structure using new absorption coefficients for ISM C-K edges
Improve LETG/HRC-S EE fractions (i.e., the fraction of all events extracted in the cross-dispersion direction)
Improve the calibration of the LETGS resolving power
LETG
Comparision of optial depth at 700 eV derived from Comparision of optial depth at 700 eV derived from imaging and gratings dataimaging and gratings data
ECS and A1795
LETG/ACIS-S