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Jet Signatures in the Spectra of Accreting Black Holes | | Michael O' Riordan
; Asaf Pe'er
; Jonathan C. McKinney
; | | Date: |
29 Oct 2015 | | Abstract: | Jets are observed as radio emission in active galactic nuclei (AGN) and
during the low/hard state in X-ray binaries (XRBs), but their contribution at
higher frequencies has been uncertain. We study the dynamics of jets in XRBs
using the general-relativistic magnetohydrodynamic (GRMHD) code HARM. We
calculate the high-energy spectra and variability properties using a
general-relativistic radiative transport code based on grmonty. We find the
following signatures of jet emission (i) a significant gamma-ray peak above ~
10^22 Hz, (ii) a break in the optical/UV spectrum, with a change in luminosity
from L ~ nu^0 to L ~ nu, followed by another break at higher frequencies where
the spectrum roughly returns to L ~ nu^0 , and (iii) a pronounced synchrotron
peak below ~ 10^15 Hz indicates that all higher energy emission originates in
the jet. We investigate the variability during a large-scale magnetic field
inversion in which the Blandford-Znajek (BZ) jet is quenched and a new
transient is launched by the reconnecting field. The ratio of the gamma-rays to
X-rays changes from L_g /L_X > 1 in the BZ jet to L_g /L_X < 1 in the
transient. We also find short timescale (~ few ms) X-ray and gamma-ray
variability in the steady BZ jet, which we attribute to the effects of QPOs
resulting from instabilities at the jet-disk interface. | | Source: | arXiv, 1510.8860 | | Services: | Forum | Review | PDF | Favorites | |
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