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Title:
Galactic black holes in the hard state, a multi-wavelength view of accretion and ejection
Authors:
Kalemci, E.; Tomsick, J. A.; Migliari, S.; Corbel, S.; Markoff, S.
Affiliation:
AA(Sabanci University, Orhanli, Tuzla, 34956, İstanbul, Turkey), AB(Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA, 94720-7450, USA), AC(Center for Astrophysics and Space Sciences, UC San Diego, La Jolla, CA, 92093-0424, USA), AD(AIM-Unite Mixte de Recherche CEA-CNRS-Universite Paris VII-UMR 7158, CEA-Saclay, Service d'Astrophysique, 91191 Gif-sur-Yvette Cedex, France), AE(Astronomical Institute Anton Pannekoek, University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, Netherlands)
Publication:
OBSERVATIONAL EVIDENCE FOR BLACK HOLES IN THE UNIVERSE: Proceedings of the 2nd Kolkata Conference on Observational Evidence for Black Holes in the Universe held in Kolkata India, 10-15 February 2008 and the Satellite Meeting on Black Holes, Neutron Stars, and Gamma-Ray Bursts held 16-17 February 2008. AIP Conference Proceedings, Volume 1053, pp. 201-208 (2008). (AIPC Homepage)
Publication Date:
10/2008
Origin:
AIP
PACS Keywords:
Galactic center, bar, circumnuclear matter, and bulge, Galactic nuclei , circumnuclear matter, and bulges, Infall, accretion, and accretion disks
DOI:
10.1063/1.3009483
Bibliographic Code:
2008AIPC.1053..201K

Abstract

The canonical hard state is associated with emission from all three fundamental accretion components: the accretion disk, the hot accretion disk corona and the jet. On top of these, the hard state also hosts very rich temporal variability properties (low frequency QPOs in the PDS, time lags, long time scale evolution). Our group has been working on the major questions of the hard state both observationally (with multi-wavelength campaigns using RXTE, SWIFT, SUZAKU, SPITZER, VLA, ATCA, SMARTS) and theoretically (through jet models that can fit entire SEDs). Through spectral and temporal analysis we seek to determine the geometry of accretion components, and relate the geometry to the formation and emission from a jet. In this presentation I will review the recent contributions of our group to the field, including the SWIFT results on the disk geometry at low accretion rates, the jet model fits to the hard state SEDs (including SPITZER data) of GRO J 1655-40, and the final results on the evolution of spectral (including X-ray, radio and infrared) and temporal properties of selected black holes in the hard states. I will also talk about impact of ASTROSAT to the science objectives of our group.
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