update on the white dwarf (( + ins) working groupda white dwarf. pg g 5 0 5 5 1520+525 adammzczak et...
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Update on the White DwarfUpdate on the White Dwarf(+ iNS) ( iNS)
Working Group
Vadim Burwitz
I t ti l A t i l C tiInternational Astronomical Consortiumfor High Energy Calibration
Apr. 10-14 2011, Frascati, Italy
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WG MembersWG Members• White Dwarfs (Chair: Vadim Burwitz).
Current members: – J.Drake (Chandra), – F.Haberl (XMM-Newton/EPIC-pn), – J Kaastra (Chandra/LETG and XMM Newton/RGS) – J.Kaastra (Chandra/LETG and XMM-Newton/RGS), – H.Marshall (Chandra/HETG), – N.Schultz (Chandra/HETG).
• Isolated Neutron Stars (Chair: Frank Haberl). Current members: – A.Beardmore (Swift/XRT), – V.Burwitz (XMM-Newton/EPIC-pn, Chandra/LETGS),
J Cottam (XMM Newton/RGS) – J.Cottam (XMM-Newton/RGS), – C.de Vries (XMM-Newton/RGS), – T.Dotani (Suzaku), – E.Miller (Suzaku/XIS), – S.Sembay (XMM-Newton/EPIC-MOS).
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OverviewOverview• Why White Dwarfs and iNSWhy White Dwarfs and iNS
• Is l t d N t St s • Isolated Neutron Stars WG little activity since last 2 IACHECs
• White Dwarfs in full action, busy completing analysis of
reprocessed and new data HZ 43, Sirius Bpand GD153 using CIAO 4.3 CALDB 4.4.3
• Status of home work from IACHEC 2010!
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Why calibration at soft X-rays Absolute Calibration between
Chandra, XMM, ROSAT, EUVE
Important for better as diverse objects as:mp f j
• White Dwarfs
M CV• Magnetic CVs
• Novae
• Supersoft sources
• Diffuse emmissi n• Diffuse emmission
• Soft end of spectra of of INS andb i h lbright powerlaw sources
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RX J0513-69 vs. other Super-soft sources
/ Å)
cm2
/ s
λ(e
rg /
F λ
λ (Å) Beuermann in Trümper & Hasinger 2008
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RX J0513-69 LETGS spectra
Burwitz et al. 2010 in prep.
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LB1919 and GD146 Adamczak et al. 2010LB 9 9 and GD 6 m z .
metal poor DA white dwarfp
DA white dwarfDA white dwarf
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PG 1520+525 Adamczak et al. 2010G 5 0 5 5 m z .
a non-pulsating PG 1159 star
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Absolute Calibration at Soft X-rays• is dependant on model spectra of WDs and iNS
h t d l t ? h i l d i ti• what models to use? physical vs. descriptive
• uncertainties? uncertainties? Beuermann et al. 2006, A&A 458, 541 Beuermann et al 2008 A&A 481 769Beuermann et al. 2008, A&A 481,769Rauch et al. 2008, A&A 481,807Kaastra et al. 2009, A&A 497,311, ,
Detailed iNSs were given at the last IACHEC #5 by Valery Suleimanov
This will be detailed WDs in the next talk today by Thomas Rauch Thomas Rauch
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Parameters obtained from fit Beuermann et al. 2006, 2008
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Simultaneous fit to RXJ1856 and the WDs
Beuermann et al. 2006, 2008
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Comparison of photon spectra
EUVEEUVE
Beuermann et al. 2006, 2008
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Comparison of EUVE data of WDsompar son of E VE ata of WDs
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HZ43, Sirius B and GD153 HZ43, Sirius B and GD153
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Correction function for LETGSCorrection function for LETGS
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HZ43, Sirius B and GD153 HZ43, Sirius B and GD153
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Reprocessed Chandra LETGS HZ43 Sirius B and GD153 HZ43, Sirius B and GD153
white dwarf Spectra
Target nH T Norm Log g Target nH[1022 cm-2]
T [K]
Norm Log g [cm/s2]
GD 153 <3 2x10-4 41000 0 50 7 8GD 153 <3.2x10 4 41000+/- 2000
0.50+/- 0.22
7.8
HZ 43 2 6 10 4 49800 1 12 7 9HZ 43 <2.6x10-4 49800+/- 2200
1.12+/- 0.43
7.9
Sirius B <2.5x10-4 25300+/- 300
117+/- 16
8.6
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Chandra LETGS HZ43 observationsChandra LETGS HZ43 observationsObs ID Date Exp (ks) GTI (ks)00059 1999-11-12 40 3500059 1999 11 12 40 3501011 2001-03-18 20 1601012 2001-08-18 20 1802584 2002-01-01 20 1602584 2002 01 01 20 1602585 2002-07-23 20 1803676 2002-04-12 20 1503677 2003-07-24 20 1605042 2003-12-20 20 2005044 2004-07-19 20 1905957 2005-02-02 20 1005959 2005-07-29 20 806473 2006-03-13 20 1906475 2006-08-07 20 1108274 2007-03-14 20 1910622 2009-03-18 20 1711933 2010-03-15 20 17
T t l 340Total 340
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HZ43 on axis 2007 2010HZ43 on-axis 2007-2010
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HZ43 on axis 1999 2010HZ43 on-axis 1999-2010
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HZ43 time dependencep
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HZ43 time dependencep
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Chandra LETGS Sirius B observationsChandra LETGS Sirius B observationsObs ID Date Exp (ks) GTI (ks)
off axis observations01421 1999-10-28 25 1401452 1999-10-26 28 1301452 1999 10 26 28 1301459 1999-10-27 12 12
on axis observations detector edgeg09617 2008-01-17 47 37
on axis observations09815 2008-05-26 51 50
Total 163 126
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Sirius B ratio on axisSirius B ratio on-axis
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Sirius B ratio off axisSirius B ratio off-axis
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Chandra LETGS GD153 observationsChandra LETGS GD153 observationsObs ID Date Exp (ks) GTI (ks)
11805 2010-03-29 25 2412132 2010-03-30 45 2812133 2010-04-01 49 4612133 2010 04 01 49 46
Total 119 98
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GD153 ratio on axisGD153 ratio on-axis
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from IACHEC 2008
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from IACHEC 2008
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from IACHEC 2009/2010
from IACHEC 2008
from IACHEC 2009/2010
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Summary Other Calibration Observations
• Chandra Calibration dataSirius B in 2008 (off axis, on axis).
HZ 43 regular observations
no Chandra LETGS INS RXJ1856 observation has been donesince the 500 ks observation , XMM and SWIFT observe it regularly.
Recent observations
• Joint SRON (Kaastra) /MPE (Predehl) /CXC (Murray)110 ks Chandra LETGS observation of
the white dwarf GD153 results presented herethe white dwarf GD153 results presented here
• WG Meeting
Meet to discuss about the GD153 data and reprocessedMeet to discuss about the GD153 data and reprocessedobservations.