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Chandra Calibration Status. CUC Meeting Oct. 22, 2013. Calibration updates since the 2012 CUC meeting Current calibration studies Internal cross-calibration results Calibration plans for the upcoming year. Chandra Calibration Status. Calibration products released over the past year. ACIS.

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chandra calibration status

Chandra Calibration Status

CUC Meeting Oct. 22, 2013

chandra calibration status1
Calibration updates since the 2012 CUC meeting
  • Current calibration studies
  • Internal cross-calibration results
  • Calibration plans for the upcoming year

Chandra Calibration Status

slide3
Calibration products released over the past year

ACIS

  • Quarterly gain corrections for ACIS-I and ACIS-S
  • A set of time-dependent QE maps (one for every two years)
  • Blank sky background files for Epoch F (2009-present) for both cti-corrected and cti-uncorrected data (graded mode).

HRC

  • Yearly gain maps for HRC-I and HRC-S
  • Yearly background and spectrum
  • HRC-S QE for the new high voltage setting.
slide4
Contamination on the ACIS Filters

Abell 1795

Blazars

E0102-72

slide5
Steps to latest ACIS contamination model:
  • Fit Abell 1795 observations using a purely elemental model and determine τ(700 eV), τ(O)/τ(C) and τ(F) as a function of time and position using the Jan 2000 observation of Abell 1795 as a fudicial point.
  • Make adjustments at in τ(C) using LETG/ACIS-S observations with gratings
  • Verify with E0102-72 observations.
contamination on the acis filters
ECS

A1795 ACIS-S

A1795 ACIS-I

Contamination on the ACIS filters

acis cc mode calibration
A memo on analyzing HETG CC-mode data will be released shortly. This analysis does not require any additional CC-mode specific calibration products. The memo discusses several Issues concerning CC-mode calibration, including:

ACIS CC-Mode Calibration

HETG/ACIS-S TE mode observation

  • Energy scale and gain
  • Detector response
  • CTI
  • Grade set distribution
  • Background
  • Presence of dust halos

CALDB Version

HEG

MEG

New Version

acis cc mode calibration1
CTI-correction uses actual chipy position

instead of chipy location of 0th order.

ACIS CC-Mode Calibration

CALDB Version

ED/EG

4U 1957+115

New Version

λ(Å)

acis cc mode calibration2

ACIS CC-Mode Calibration

Good agreement between the four HETG spectra for sources with no dust halo.

CALDB Version

New Version

acis cc mode calibration3

ACIS CC-Mode Calibration

CALDB Version

New Version

core of the point spread function

Core of the Point Spread Function

CALDB Version

Schematic view of the HRC

New Version

hetg 0 th order calibration
SN 1987a

0.5-5keV band

HETG 0th Order Calibration

CALDB Version

New Version

slide24
Summary of Present Calibration Activities

ACIS

  • Release updated contamination model Nov-Dec 2013
  • Release improved low energy (E<500 eV) for the BI chips
  • Further cross-calibration studies

HETG

  • Post memo on the analysis of HETG/ACIS-S CC-mode data
  • Examine MEG/HEG cross-calibration

LETG

  • Post memo on optimizing the extraction region of LETG/HRC-S spectra
  • Release updated OSIP file for LETG/ACIS-S spectra
  • Update LETG extraction efficiencies
slide25
Summary of Present Calibration Activities

HRC

  • Updated HRC-S QE at the new high voltage setting

HRMA

  • Calibrate PSF/wing profiles using Her X-1 data and an improved prescription for out-of-plane scattering.
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