Vadim Burwitz EPIC CAL/OPS May 4-5 2006, MPE
description
Transcript of Vadim Burwitz EPIC CAL/OPS May 4-5 2006, MPE
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
Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Overview 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 by Frank Haberl)
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
Different bound-free and free-free absorption coefficients
-- Seaton
-- Karzas & Latter
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
Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
HZ43 temperature vs. gravity
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
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
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
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
Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
LETG + HRC-S effective areas
Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Parameters obtained from fit
Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Comparison of photon spectra
EUVE
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 star
Individual fits
with
all parameters
free:
Simu
ltaneous fits
with
NH lin
ked:
Model:tbabs*bbody
from Frank Haberl
Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006
Summary