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Resolved, expanding jets in the Galactic black hole candidate XTEJ1908+094

Resolved, expanding jets in the Galactic black hole candidate XTEJ1908+094
Resolved, expanding jets in the Galactic black hole candidate XTEJ1908+094
Black hole X-ray binaries undergo occasional outbursts caused by changing inner accretion flows. Here we report high angular resolution radio observations of the 2013 outburst of the black hole candidate X-ray binary system XTE J1908+094, using data from the Very Long Baseline Array and European VLBI Network. We show that following a hard-to-soft state transition, we detect moving jet knots that appear asymmetric in morphology and brightness, and expand to become laterally resolved as they move away from the core, along an axis aligned approximately −11° east of north. We initially see only the southern component, whose evolution gives rise to a 15-mJy radio flare and generates the observed radio polarization. This fades and becomes resolved out after 4 days, after which a second component appears to the north, moving in the opposite direction. From the timing of the appearance of the knots relative to the X-ray state transition, a 90° swing of the inferred magnetic field orientation, the asymmetric appearance of the knots, their complex and evolving morphology, and their low speeds, we interpret the knots as working surfaces where the jets impact the surrounding medium. This would imply a substantially denser environment surrounding XTE J1908+094 than has been inferred to exist around the microquasar sources GRS 1915+105 and GRO J1655−40.
0035-8711
2788-2802
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Rushton, Anthony
47ead273-0c2e-4f1c-adc0-358a5afed75f
Miller-Jones, James C. A.
cf33687c-452d-4d05-b0ef-ab9559afee59
Curran, P.A.
ea641045-4e92-47a9-b852-80ca5c39a232
Altamirano, Diego, Rushton, Anthony, Miller-Jones, James C. A. and Curran, P.A. (2017) Resolved, expanding jets in the Galactic black hole candidate XTEJ1908+094 Monthly Notices of the Royal Astronomical Society, 468, (3), pp. 2788-2802.

Altamirano, Diego, Rushton, Anthony, Miller-Jones, James C. A. and Curran, P.A. (2017) Resolved, expanding jets in the Galactic black hole candidate XTEJ1908+094 Monthly Notices of the Royal Astronomical Society, 468, (3), pp. 2788-2802.

Record type: Article

Abstract

Black hole X-ray binaries undergo occasional outbursts caused by changing inner accretion flows. Here we report high angular resolution radio observations of the 2013 outburst of the black hole candidate X-ray binary system XTE J1908+094, using data from the Very Long Baseline Array and European VLBI Network. We show that following a hard-to-soft state transition, we detect moving jet knots that appear asymmetric in morphology and brightness, and expand to become laterally resolved as they move away from the core, along an axis aligned approximately −11° east of north. We initially see only the southern component, whose evolution gives rise to a 15-mJy radio flare and generates the observed radio polarization. This fades and becomes resolved out after 4 days, after which a second component appears to the north, moving in the opposite direction. From the timing of the appearance of the knots relative to the X-ray state transition, a 90° swing of the inferred magnetic field orientation, the asymmetric appearance of the knots, their complex and evolving morphology, and their low speeds, we interpret the knots as working surfaces where the jets impact the surrounding medium. This would imply a substantially denser environment surrounding XTE J1908+094 than has been inferred to exist around the microquasar sources GRS 1915+105 and GRO J1655−40.

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More information

Accepted/In Press date: 27 February 2017
e-pub ahead of print date: 4 March 2017
Published date: July 2017
Additional Information: Arxiv AM, ref no 1703.02110v2 as confirmed by the Author.
Organisations: Astronomy Group, Centre for Biological Sciences

Identifiers

Local EPrints ID: 411339
URI: http://eprints.soton.ac.uk/id/eprint/411339
ISSN: 0035-8711
PURE UUID: 3eb1a8d4-ac58-4add-8bd0-fa1563ef2216
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

Catalogue record

Date deposited: 19 Jun 2017 16:30
Last modified: 29 Jul 2017 05:42

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Contributors

Author: Diego Altamirano ORCID iD
Author: Anthony Rushton
Author: James C. A. Miller-Jones
Author: P.A. Curran

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