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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Cross-calibration results from observations of the
INS RX J1856RX J1856, and theWDs HZ 43HZ 43 and Sirius BSirius B
Vadim Burwitz
EPIC CAL/OPS May 4-5 2006, MPE
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 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)
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Overview
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
NLTE pure H model spectrum of HZ43Different bound-free and free-free absorption coefficients
-- Seaton
-- Karzas & Latter
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
NLTE pure H model spectrum of HZ43
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
HZ43 temperature vs. gravity
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
HZ43 temperature vs. gravity
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
RX J1856-37 two temperature bb fit
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
RX J1856-37 two temperature bb fit
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Simultaneous fit to RXJ1856 and the WDs
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Simultaneous fit to RXJ1856 and the WDs
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
LETG + HRC-S effective areas
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Parameters obtained from fit
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Parameters obtained from fit
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Comparison of photon spectra
EUVE
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Comparison of photon spectra
EUVE
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
RX J1856.5–3754: A `stable‘ neutron starIndividual fits with all param
eters free:Sim
ultaneous fits with N
H linked:
Model:tbabs*bbody
from Frank Haberl
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Summary
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
HZ 43 residuals
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Comparison Chandra LETGS and EUVE
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Comparison WD models with ROSAT
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Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
LETGS long-term lightcurve of HZ43