1 / 20

ACIS Calibration: Recent Updates, Planned Updates, & Future Issues

ACIS Calibration: Recent Updates, Planned Updates, & Future Issues E0102: Joint Fits with ACIS S3, MOS1/2 & pn Paul Plucinsky, Joseph DePasquale, & Steve Snowden. 1. Recent Updates to the ACIS Calibration. CALDB 3.3.0 released on 15 December 2006.

juliannag
Télécharger la présentation

ACIS Calibration: Recent Updates, Planned Updates, & Future Issues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ACIS Calibration: Recent Updates, Planned Updates, & Future Issues E0102: Joint Fits with ACIS S3, MOS1/2 & pn Paul Plucinsky, Joseph DePasquale, & Steve Snowden

  2. 1. Recent Updates to the ACIS Calibration CALDB 3.3.0 released on 15 December 2006 • BI CCD CTI correction for -120 C (S3 & S1), need to have CIAO 3.4 also to apply the correction, BI CTI correction is now part of the standard data processing • Effective area correction around the Si K edge, ~4 % at 1.8 keV • FI CCD ``dead area’’ correction to account for the area lost on average in each frame to cosmic rays, 2.5-4.0% as a function of row

  3. Planned Update: CTI Correction for Graded Mode for FI CCDs • Faint mode CTI correction adjusts the PH of each pixel in the 3x3 event island • In Graded mode, only have x, y position of event, grade, and summed PH • Use grade and summed PH to determine the most likely charge distribution based on ``average’’ images • Use this information in an Graded mode CTI correction Mn-K flight grade 8 (left split) for S2 Bottom 256 rows Top 256 rows Vikhlinin (SAO)

  4. Map of Good and Bad Grades Vikhlinin (SAO) 33 of 256 flight grades are included in the ASCA G02346 grades Create average images for each of these 33 grades for multiple energies

  5. Comparison of Graded Mode and Faint Mode CTI Correction Posson-Brown (SAO) Graded mode CTI correction provides most of the benefit of the Faint mode correction For FI CCDs only !

  6. Continuous Clocking Mode Calibration External Calibration Source: No CTI correction applied Edgar (SAO) • In CC mode: • row-to-row transfer time is different so the effects of CTI are different • - don’t know the y position of the events, but for some observations you know the y position of the source

  7. Update on Contaminant Buildup Data: Grant (MIT) Model: O’Dell & Tennant (MSFC)

  8. Optical Depth Comparison C-K Marshall (MIT) inferred optical depth at 700 eV ECS Grant (MIT) Mn L E0102 DePasquale (SAO) OVIII Ly-a

  9. Future Issues: Focal Plane Operating Temperature • current operating temperature is -119.7 C • as the mission has progressed, the frequency and magnitude of deviations from the desired temperature have increased • it might become necessary to operate at a higher temperature, significant impact for the FI CCDs

  10. 2. E0102: Gratuitous Pretty Pictures of E0102 RGS Spectrum (Pollock 2006) S3 Summed Data ~100 ks Objective: develop a spectral model which can be used by RGS, HETG, EPIC & ACIS, etc.

  11. Application of RGS Spectral Model Dewey (MIT) Use RGS spectral model Construct a spatial model Compare simulation to data Bright lines agree well

  12. MEG minus 1st order MgXI NeX NeIX OVIII OVII Simulation Comparison KS test

  13. MEG plus 1st order MgXI NeX NeIX OVIII OVII Simulation Comparison KS test

  14. Joint Fit with Pollock Model to ACIS S3, MOS1/2 & pn SAS 7.0, latest CCF Many thanks Steve !! No fit, adopt Pollock RGS model Brems kT = 0.36 keV CCD spectra prefer a harder continuum NH=5.36e20 Line Es and widths frozen, Norms free

  15. Joint Fit with Pollock Model to ACIS S3, MOS1/2 & pn Fit, Brems kT =0.60 keV NH=5.36e20 Line Es & widths frozen, norms free

  16. Individual Fit with Pollock Model to ACIS S3 Fit, Brems kT =0.60 keV NH=5.36e20 Line Es & widths frozen, norms free

  17. Individual Fit with Pollock Model to MOS1 Fit, Brems kT =0.60 keV NH=5.36e20 Line Es & widths frozen, norms free

  18. Individual Fit with Pollock Model to MOS1: Ne lines free Fit, Brems kT =0.65 keV NH=5.36e20 Ne Line Es free, widths frozen, norms free

  19. Individual Fit with Pollock Model to pn Fit, Brems kT =0.40 keV NH=5.36e20 Line Es frozen, widths frozen, norms free

  20. Let’s Agree on a Model !!!!!!! Purpose: to improve the low-energy response model of ACIS, MOS and pn CCD instruments RGS and HETG agree on flux of bright lines RGS and HETG compromise on existence of weak lines RGS and HETG agree on widths for the lines Select a continuum model and absorption HETG team must analyze second epoch observations of E0102 Fit ACIS, MOS, and pn with the same model

More Related