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