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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
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)

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


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 PSPC
K. Beuermann, V. Burwitz and T. Rauch

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


NLTE pure H model spectrum of HZ43

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


HZ43 temperature vs. gravity

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


RX J1856-37 two temperature bb fit

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


RX J1856-37 two temperature bb fit

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


Simultaneous fit to RXJ1856 and the WDs

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


Parameters obtained from fit

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


Comparison of photon spectra
EUVE

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


RX J1856.5­3754: A `stable` neutron star
Individual fits with all parameters free: Simultaneous fits with NH linked:

Model: tbabs*bbody from Frank Haberl
Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006


Summary

Vadim Burwitz

EPIC Calibration Meeting, October 27, 2006