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Cross-calibration results from observations of the INS RX J1856, and the WDs HZ 43 and Sirius B

Vadim Burwitz EPIC CAL/OPS May 4-5 2006, MPE
Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006


Overview

Absolute Calibration Soft Xrays dependant on model spectra of WDs what models to use?, uncertainties?



Analyse LETG + HRCS data HZ 43A, Sirius B and RX J1856.53754

determine spectral parameters improve effective area.



Compare obtained photon spectra with EUVE and ROSAT

and XMM (work by Frank Haberl)

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


Overview

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


NLTE pure H model spectrum of HZ43
Different bound-free and free-free absorption coefficients

-- Seaton -- Karzas & Latter

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


NLTE pure H model spectrum of HZ43

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


HZ43 temperature vs. gravity

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


HZ43 temperature vs. gravity

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


RX J1856-37 two temperature bb fit

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


RX J1856-37 two temperature bb fit

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


Simultaneous fit to RXJ1856 and the WDs

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


Simultaneous fit to RXJ1856 and the WDs

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


LETG + HRC-S effective areas

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


Parameters obtained from fit

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


Parameters obtained from fit

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


Comparison of photon spectra
EU V E

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


Comparison of photon spectra
EU V E

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 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 CAL/OPS, MPE May 4, 2006


Summary

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


HZ 43 residuals

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


Comparison Chandra LETGS and EUVE

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


Comparison WD models with ROSAT

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006


LETGS long-term lightcurve of HZ43

Vadim Burwitz

EPIC CAL/OPS, MPE May 4, 2006