title   
  

Complete multiwavelength evolution of galactic black hole transients during outburst decay I: conditions for "compact" jet formation

Kalemci, Emrah and Dinçer, Tolga and Tomsick, John A. and Buxton, Michelle M. and Bailyn, Charles D. and Chun, Yoon Young (2013) Complete multiwavelength evolution of galactic black hole transients during outburst decay I: conditions for "compact" jet formation. Astrophysical Journal, 779 (2). ISSN 0004-637X (Print) 1538-4357 (Online)

[img]PDF (This is a RoMEO green journal -- author can archive pre-print (ie pre-refereeing) and post-print (ie final draft post-refereeing)) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
713Kb

Official URL: http://dx.doi.org/10.1088/0004-637X/779/2/95

Abstract

Compact, steady jets are observed in the near infrared and radio bands in the hard state of Galactic black hole transients as their luminosity decreases and the source moves towards a quiescent state. Recent radio observations indicate that the jets turn o completely in the soft state, therefore multiwavelength monitoring of black hole transients are essential to probe the formation of jets. In this work we conducted a systematic study of all black hole transients with near infrared and radio coverage during their outburst decays. We characterized the timescales of changes in X-ray spectral and temporal properties and also in near infrared and/or in radio emission. We confirmed that state transitions occur in black hole transients at a very similar fraction of their respective Eddington luminosities. We also found that the near infrared flux increase that could be due to the formation of a compact jet is delayed by a time period of days with respect to the formation of a corona. Finally, we found a threshold disk Eddington luminosity fraction for the compact jets to form. We explain these results with a model such that the increase in the near infrared flux corresponds to a transition from a patchy, small scale height corona along with an optically thin out flow to a large scale height corona that allows for collimation of a steady compact jet. We discuss the timescale of jet formation in terms of transport of magnetic fields from the outer parts of the disk, and also consider two alternative explanations for the multiwavelength emission: hot inner accretion flows and irradiation.

Item Type:Article
Additional Information:Article Number: 95
Uncontrolled Keywords:accretion, accretion disks; binaries: close; black hole physics; X-rays: stars
Subjects:Q Science > QB Astronomy > QB460-466 Astrophysics
ID Code:22694
Deposited By:Emrah Kalemci
Deposited On:04 Dec 2013 11:36
Last Modified:04 Dec 2013 11:36

Repository Staff Only: item control page