Astrophys. J., 805, 30 (2015/May-3)
Sub-mm jet properties of the X-ray binary Swift J1745-26.
TETARENKO A.J., SIVAKOFF G.R., MILLER-JONES J.C.A., CURRAN P.A., RUSSELL T.D., COULSON I.M., HEINZ S., MAITRA D., MARKOFF S.B., MIGLIARI S., PETITPAS G.R., RUPEN M.P., RUSHTON A.P., RUSSELL D.M. and SARAZIN C.L.
Abstract (from CDS):
We present the results of our observations of the early stages of the 2012-2013 outburst of the transient black hole X-ray binary (BHXRB), Swift J1745-26, with the Very Large Array, Submillimeter Array, and James Clerk Maxwell telescope (SCUBA-2). Our data mark the first multiple-band mm and sub-mm observations of a BHXRB. During our observations the system was in the hard accretion state producing a steady, compact jet. The unique combination of radio and mm/sub-mm data allows us to directly measure the spectral indices in and between the radio and mm/sub-mm regimes, including the first mm/sub-mm spectral index measured for a BHXRB. Spectral fitting revealed that both the mm (230 GHz) and sub-mm (350 GHz) measurements are consistent with extrapolations of an inverted power law from contemporaneous radio data (1-30 GHz). This indicates that, as standard jet models predict, a power law extending up to mm/sub-mm frequencies can adequately describe the spectrum, and suggests that the mechanism driving spectral inversion could be responsible for the high mm/sub-mm fluxes (compared to radio fluxes) observed in outbursting BHXRBs. While this power law is also consistent with contemporaneous optical data, the optical data could arise from either jet emission with a jet spectral break frequency of or the combination of jet emission with a lower jet spectral break frequency of and accretion disk emission. Our analysis solidifies the importance of the mm/sub-mm regime in bridging the crucial gap between radio and IR frequencies in the jet spectrum, and justifies the need to explore this regime further.
black hole physics - ISM: jets and outflows - radio continuum: stars - stars: individual: Swift J1745-26 - submillimeter: stars - X-rays: binaries
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