Further work on cross-calibration
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Vadim Burwitz EPIC Calibration Meeting October 2006, Mallorca PowerPoint PPT Presentation


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Further work on cross-calibration results obtained from observations of the INS RX J1856 , and the WDs HZ 43 and Sirius B. Vadim Burwitz EPIC Calibration Meeting October 2006, Mallorca. Overview. Paper on this topic published in 2006 A&A 458, 541 Absolute Calibration Soft X-rays

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Vadim Burwitz EPIC Calibration Meeting October 2006, Mallorca

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Further work on cross-calibrationresults obtained from observations of the INS RX J1856, and theWDs HZ 43 and Sirius B

Vadim Burwitz

EPIC Calibration Meeting October 2006, Mallorca


Overview

  • Paper on this topic published in 2006 A&A 458, 541

  • Absolute Calibration Soft X-rays

     dependant on model spectra of WDs

    what models to use?, uncertainties?

  • Analyse LETG + HRC-S data HZ 43A, Sirius B and RX J1856.5-3754

     determine spectral parameters

     improve effective area.

  • Compare obtained photon spectra with EUVE and ROSAT

    and XMM (work together with Frank Haberl)


The Paper published: 2006 A&A 458, 541

Establishing HZ43 A, Sirius B, and RX J185635-3754 as soft X-ray standards: a cross-calibration between the Chandra LETG+HRC-S, the EUVE spectrometer, and the ROSAT PSPCK. Beuermann, V. Burwitz and T. Rauch


NLTE pure H model spectrum of HZ43


HZ43 temperature vs. gravity


RX J1856-37 two temperature bb fit


RX J1856-37 two temperature bb fit


Simultaneous fit to RXJ1856 and the WDs


Parameters obtained from fit


EUVE

Comparison of photon spectra


RX J1856.5–3754: A `stable‘ neutron star

Individual fits with

all parameters free:

Simultaneous fits with

NH linked:

Model:

tbabs*bbody

from Frank Haberl


Summary


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