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Abstract:

To date, mid-infrared properties of Galactic black hole binaries have barely been investigated in the framework of multi-wavelength campaigns. Yet, studies in this spectral domain are crucial to get complementary information on the presence of dust and/or on the physical processes such as dust heating and thermal bremsstrahlung. Here, we report a long-term multi-wavelength study of the microquasar GRS 1915+105. On the one hand, we aimed at understanding the origins of the mid-infrared emission, and on the other hand, at searching for correlation with the high-energy and/or radio activities. We observed the source at several epochs between 2004 and 2006 with the photometer IRAC and spectrometer IRS, both mounted on the Spitzer Space Telescope. When available, we completed our set of data with quasi-simultaneous RXTE/INTEGRAL high-energy and/or Ryle radio observations from public archives. We then studied the mid-infrared environment and activities of GRS 1915+105 through spectral analysis and broadband fitting of its radio to X-ray spectral energy distributions. We detected polycyclic aromatic hydrocarbon molecules in all but one IRS spectra of GRS 1915+105 which unambiguously proves the presence of a dust component, likely photoionized by the high-energy emission. We also argue that this dust is distributed in a disk-like structure heated by the companion star, as observed in some Herbig Ae/Be and isolated cool giant stars. Moreover, we show that some of the soft X-ray emission emanating from the inner regions of the accretion disk is reprocessed and thermalized in the outer part. This leads to a mid-infrared excess that is very likely correlated to the soft X-ray emission. We exclude thermal bremsstrahlung as contributing significantly in this spectral domain. © 2010. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:Long-term multi-wavelength studies of GRS 1915+105. I. A high-energy and mid-infrared focus with RXTE/integral and Spitzer
Autor:Rahoui, F.; Chaty, S.; Rodriguez, J.; Fuchs, Y.; Mirabel, I.F.; Pooley, G.G.
Filiación:Laboratoire AIM, CEA/DSM, CEA/Saclay, F-91191 Gif-sur-Yvette, France
AstroParticule and Cosmologie (APC), Université Paris VII/CNRS/CEA, Bt. Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
Instituto de Astronomia y Fisica Del Espacio-CONICET, CC 67, Suc. 28 (C1428ZAA), Buenos Aires, Argentina
Astrophysics, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
Palabras clave:Accretion; Accretion disks; Binaries: close; Dust; Extinction; Infrared: stars; X-rays: binaries
Año:2010
Volumen:715
Número:2
Página de inicio:1191
Página de fin:1202
DOI: http://dx.doi.org/10.1088/0004-637X/715/2/1191
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v715_n2_p1191_Rahoui

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Citas:

---------- APA ----------
Rahoui, F., Chaty, S., Rodriguez, J., Fuchs, Y., Mirabel, I.F. & Pooley, G.G. (2010) . Long-term multi-wavelength studies of GRS 1915+105. I. A high-energy and mid-infrared focus with RXTE/integral and Spitzer. Astrophysical Journal, 715(2), 1191-1202.
http://dx.doi.org/10.1088/0004-637X/715/2/1191
---------- CHICAGO ----------
Rahoui, F., Chaty, S., Rodriguez, J., Fuchs, Y., Mirabel, I.F., Pooley, G.G. "Long-term multi-wavelength studies of GRS 1915+105. I. A high-energy and mid-infrared focus with RXTE/integral and Spitzer" . Astrophysical Journal 715, no. 2 (2010) : 1191-1202.
http://dx.doi.org/10.1088/0004-637X/715/2/1191
---------- MLA ----------
Rahoui, F., Chaty, S., Rodriguez, J., Fuchs, Y., Mirabel, I.F., Pooley, G.G. "Long-term multi-wavelength studies of GRS 1915+105. I. A high-energy and mid-infrared focus with RXTE/integral and Spitzer" . Astrophysical Journal, vol. 715, no. 2, 2010, pp. 1191-1202.
http://dx.doi.org/10.1088/0004-637X/715/2/1191
---------- VANCOUVER ----------
Rahoui, F., Chaty, S., Rodriguez, J., Fuchs, Y., Mirabel, I.F., Pooley, G.G. Long-term multi-wavelength studies of GRS 1915+105. I. A high-energy and mid-infrared focus with RXTE/integral and Spitzer. Astrophys. J. 2010;715(2):1191-1202.
http://dx.doi.org/10.1088/0004-637X/715/2/1191