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Tracing the Jet Contribution to the Mid-IR over the 2005 Outburst of GRO J1655-40 via Broadband Spectral ModelingWe present new results from a multi-wavelength (radio/infrared/optical/X-ray) study of the black hole Xray binary GRO 51655-40 during its 2005 outburst. We detected, for the first time, mid-infrared emission at 24 micron from the compact jet of a black hole X-ray binary during its hard state, when the source shows emission from a radio compact jet, as well as a strong non-thermal hard X-ray component. These detections strongly constrain the optically thick part of the synchrotron spectrum of the compact jet, which is consistent with it being flat over 4 orders of magnitude in frequency. Moreover, using this unprecedented coverage, and especially thanks to the new Spitzer observations, we can test broadband disk and jet models during the hard state. Two of the hard-state broadband spectra are reasonably well fitted using a jet model with parameters that overall are similar to those previously found for Cyg X-1 and GX 339-4. Differences are also present; most notably, the jet power in GRO J1655-40 appears to be a factor of at least approximately 3-5 higher (depending on the distance) than those of Cyg X-1 and GX-339-4 at comparable disk luminosities. Furthermore, a few discrepancies between the model and the data, previously not found for the other two black hole systems for which there was no mid-IR/IR and optical coverage, are evident, and will help to constrain and refine theoretical models.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Migliari, S. (California Univ., San Diego La Jolla, CA, United States)
Tomsick, J. A. (California Univ., San Diego La Jolla, CA, United States)
Markoff, S. (Amsterdam Univ. Netherlands)
Kalemci, E. (Sabanci Univ. Istanbul, Turkey)
Bailyn, C. D. (Yale Univ. New Haven, CT, United States)
Buxton, M. (Columbia Univ. New York, NY, United States)
Corbel, S (Paris VII Univ. France)
Fender, R. P. (Southampton Univ. Hampshire, United Kingdom)
Kaaret, P. (Iowa Univ. Iowa City, IA, United States)
Date Acquired
August 24, 2013
Publication Date
November 20, 2007
Publication Information
Publication: The Astrophysical Journal
Volume: 670
Subject Category
Funding Number(s)
Distribution Limits