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Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J1856 HZ 43Sirius B Further work on cross-calibration results obtained from observations of.

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Presentation on theme: "Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J1856 HZ 43Sirius B Further work on cross-calibration results obtained from observations of."— Presentation transcript:

1 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J1856 HZ 43Sirius B 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

2 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 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)

3 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 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 PSPC K. Beuermann, V. Burwitz and T. Rauch The Paper published: 2006 A&A 458, 541

4 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 NLTE pure H model spectrum of HZ43

5 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 HZ43 temperature vs. gravity

6 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J1856-37 two temperature bb fit

7 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J1856-37 two temperature bb fit

8 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Simultaneous fit to RXJ1856 and the WDs

9 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Parameters obtained from fit

10 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Comparison of photon spectra EUVE

11 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J1856.5–3754: A `stable‘ neutron star Individual fits withall parameters free: Simultaneous fits withN H linked: Model: tbabs*bbody from Frank Haberl

12 Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Summary

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