SIMBAD references

2016MNRAS.456.2707P - Mon. Not. R. Astron. Soc., 456, 2707-2716 (2016/March-1)

A clean sightline to quiescence: multiwavelength observations of the high Galactic latitude black hole X-ray binary Swift J1357.2-0933.

PLOTKIN R.M., GALLO E., JONKER P.G., MILLER-JONES J.C.A., HOMAN J., MUNOZ-DARIAS T., MARKOFF S., ARMAS PADILLA M., FENDER R., RUSHTON A.P., RUSSELL D.M. and TORRES M.A.P.

Abstract (from CDS):

We present coordinated multiwavelength observations of the high Galactic latitude (b = +50°) black hole X-ray binary (BHXB) Swift J1357.2-0933 in quiescence. Our broad-band spectrum includes strictly simultaneous radio and X-ray observations, and near-infrared, optical, and ultraviolet data taken 1-2 d later. We detect Swift J1357.2-0933 at all wavebands except for the radio (f5GHz < 3.9µJy/beam; 3σrms). Given current constraints on the distance (2.3-6.3 kpc), its 0.5-10 keV X-ray flux corresponds to an Eddington ratio LX/LEdd = 4x10–9-3x10–8 (assuming a black hole mass of 10M). The broad-band spectrum is dominated by synchrotron radiation from a relativistic population of outflowing thermal electrons, which we argue to be a common signature of short-period quiescent BHXBs. Furthermore, we identify the frequency where the synchrotron radiation transitions from optically thick-to-thin (νb ~ 2-5x1014 Hz), which is the most robust determination of a `jet break' for a quiescent BHXB to date. Our interpretation relies on the presence of steep curvature in the ultraviolet spectrum, a frequency window made observable by the low amount of interstellar absorption along the line of sight. High Galactic latitude systems like Swift J1357.2-0933 with clean ultraviolet sightlines are crucial for understanding black hole accretion at low luminosities.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): accretion, accretion discs - stars: individual: Swift J1357.2-0933 - ISM: jets and outflows - X-rays: binaries

Simbad objects: 12

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2021.06.25-15:30:18

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