Multiwavelength Comparisons Between Two Recent Xray Novae

1
Multiwavelength Comparisons Between Two Recent
X-ray Novae

• M. Cadolle Bel, L. Prat, J. Rodriguez, L.
  Barragan, E. Kuulkers, M. Ribo, J. Moldon, P.
  DAvanzo, S. Campana, S. Corbel, S. Chaty, J.
  Zurita-Heras, D. Hannikainen, A. Goldwurm and P.
  Goldoni

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Introduction

• X-ray NovaeLMXBs usually in quiescence which may
  undergo bright month-long outbursts
• Several spectral states showing component
  evolutionshints on accretion/ejection processes
• Wide-band campaigns essential INTEGRAL, Swift,
  RXTE, EMMI, REM, VLA, ATCA

2 interesting new microquasars the BHCs XTE
J1818-245 and XTE J1817-330
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A Picture of the Emissive Zones
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Data Log

• XTE J1818-245 (outburst Aug.-Oct. 2005)
• Discovered in hard X-rays by RXTE/ASM on Aug. 12
  (Levine et al. 2005)
• Three INTEGRAL ToOs (Aug. 20-29) Goldoni et al.
  2005 Galactic Bulge monitoring program
  (Aug.-Oct.) Kuulkers et al. 2007 Simultaneous
  Swift, RXTE (daily), NTT (PI Chaty), REM (PI
  Goldoni) and VLA/VLBA (PI Ribo)
• XTE J1817-330 (outburst Jan.-April 2006)
• Discovered in hard X-rays by RXTE/ASM on Jan. 26
  (Remillard et al. 2006)
• Two INTEGRAL ToOs (Feb. 14-17 March 4-7) Goldoni
  et al. 2006 Galactic Bulge monitoring program
  (Feb.-Apr.) Kuulkers et al. 2007 Simultaneous
  RXTE (daily), REM (PI Goldoni) and ATCA data (PI
  Corbel)

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(Nice!) Hard X-ray Pictures
Outburst Jan.-Apr. 2006 (243s, 20-40 keV, 130 ks)
Outburst Aug.-Oct. 2005 (28s, 20-40 keV, 70 ks)
Cadolle Bel et al. 2008a
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Light Curves of XTE J1818-245
Gamma-rays
X-rays
(N)IR/Opt.
1.4 GHz
Radio
4.8 GHz
8.4 GHz
Spectral Energy Distributions (SEDs)
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HID and Spectral Parameters of XTE J1818-245
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Spectra of XTE J1818-245
Cadolle Bel et al. 2008b, subm. to AA
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SED I of XTE J1818-245
20-21 Aug. Average Swift/XRT, RXTE/PCAHEXTE and
INTEGRAL/JEM-XISGRI spectra
kTin0.6 keV Gamma2.2
Radio VLA flux (6cm) x4 in less than one day!
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SED II of XTE J1818-245
22-23 Aug. Average RXTE/PCAHEXTE and
INTEGRAL/JEM-XISGRI spectra
NTT
kTin0.6 keV Gamma2.4
Flat VLA spectrum (1.4, 4.8, 8.4 GHz)
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Light Curves and HID of XTE J1817-330
R
I
(N)IR/Opt.
K
Radio
SEDs
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Spectral Parameters of XTE J1817-330
VLA flare
ATCA flare
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Spectra and SED of XTE J1817-330
4-7 March Average RXTE/PCAHEXTE and
INTEGRAL/JEM-XISGRI spectra
kTin0.7 keV Gamma2.4
REM/UVOT
Excess over diskbb more X-ray reprocessing
(irradiated disk) than synchrotron emission?
ATCA flat spectrum compact jet
Cadolle Bel et al. 2008a
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Conclusions

• Classical evolutions of disc temperatures, Fe
  lines and power law hard components of BHs but
  slight deviations from the standard picture
  (e.g. Cadolle Bel. et al. 2007 for discrepancies
  between the radio/X-ray correlation in hard
  states)
• Clear optical/IR excess over viscous disc model.
  Reprocessing of X-rays (irradiated disc) more
  than synchrotron emission?
• Radio flares compact jet/discrete ejections
  (bubbles)? Ok if source in hard part of the IS
  and shortly transits to the soft part not always
  the case here
• Both sources show specific oscillating HID paths
  need to go deeper in the detailed relations
  between X-rays and radio flares...
• Future missions