Tracking the variable jets of V404 Cygni during its 2015 outburst
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We present multifrequency monitoring observations of the black hole X-ray binary V404 Cygni throughout its 2015 June outburst. Our data set includes radio and mm/sub-mm photometry, taken with the K...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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OXFORD UNIV PRESS
2019
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/80177 |
| _version_ | 1848764173044940800 |
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| author | Tetarenko, A.J. Sivakoff, G.R. Miller-Jones, James Bremer, M. Mooley, K.P. Fender, R.P. Rumsey, C. Bahramian, Arash Altamirano, D. Heinz, S. Maitra, D. Markoff, S.B. Migliari, S. Rupen, M.P. Russell, D.M. Russell, T.D. Sarazin, C.L. |
| author_facet | Tetarenko, A.J. Sivakoff, G.R. Miller-Jones, James Bremer, M. Mooley, K.P. Fender, R.P. Rumsey, C. Bahramian, Arash Altamirano, D. Heinz, S. Maitra, D. Markoff, S.B. Migliari, S. Rupen, M.P. Russell, D.M. Russell, T.D. Sarazin, C.L. |
| author_sort | Tetarenko, A.J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We present multifrequency monitoring observations of the black hole X-ray binary V404 Cygni throughout its 2015 June outburst. Our data set includes radio and mm/sub-mm photometry, taken with the Karl G. Jansky Very Large Array, Arc-Minute MicroKelvin Imager Large Array, Sub-millimeter Array, James Clerk Maxwell Telescope, and the Northern Extended Millimetre Array, combined with publicly available infrared, optical, UV, and X-ray measurements. With these data, we report detailed diagnostics of the spectral and variability properties of the jet emission observed during different stages of this outburst. These diagnostics show that emission from discrete jet ejecta dominated the jet emission during the brightest stages of the outburst. We find that the ejecta became fainter, slower, less frequent, and less energetic, before the emission transitioned (over 1-2 d) to being dominated by a compact jet, as the outburst decayed towards quiescence. While the broad-band spectrum of this compact jet showed very little evolution throughout the outburst decay (with the optically thick to thin synchrotron jet spectral break residing in the near-infrared/optical bands; ∼2-5 × 1014 Hz), the emission still remained intermittently variable at mm/sub-mm frequencies. Additionally, we present a comparison between the radio jet emission throughout the 2015 and previous 1989 outbursts, confirming that the radio emission in the 2015 outburst decayed significantly faster than in 1989. Lastly, we detail our sub-mm observations taken during the 2015 December mini-outburst of V404 Cygni, which demonstrate that, similar to the main outburst, the source was likely launching jet ejecta during this short period of renewed activity. |
| first_indexed | 2025-11-14T11:15:08Z |
| format | Journal Article |
| id | curtin-20.500.11937-80177 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:15:08Z |
| publishDate | 2019 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-801772020-07-29T09:40:57Z Tracking the variable jets of V404 Cygni during its 2015 outburst Tetarenko, A.J. Sivakoff, G.R. Miller-Jones, James Bremer, M. Mooley, K.P. Fender, R.P. Rumsey, C. Bahramian, Arash Altamirano, D. Heinz, S. Maitra, D. Markoff, S.B. Migliari, S. Rupen, M.P. Russell, D.M. Russell, T.D. Sarazin, C.L. Science & Technology Physical Sciences Astronomy & Astrophysics black hole physics stars: individual (V404 Cygni, GS 2023+338) ISM: jets and outflows radio continuum: stars submillmetre: stars X-rays: binaries X-RAY BINARIES TRANSIENT GS 2023+338 BROAD-BAND SPECTRUM HARD STATE SYNCHROTRON EMISSION MULTIPLE EJECTIONS RELATIVISTIC JETS ACCRETION DISC RADIO-EMISSION MINI-OUTBURSTS © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We present multifrequency monitoring observations of the black hole X-ray binary V404 Cygni throughout its 2015 June outburst. Our data set includes radio and mm/sub-mm photometry, taken with the Karl G. Jansky Very Large Array, Arc-Minute MicroKelvin Imager Large Array, Sub-millimeter Array, James Clerk Maxwell Telescope, and the Northern Extended Millimetre Array, combined with publicly available infrared, optical, UV, and X-ray measurements. With these data, we report detailed diagnostics of the spectral and variability properties of the jet emission observed during different stages of this outburst. These diagnostics show that emission from discrete jet ejecta dominated the jet emission during the brightest stages of the outburst. We find that the ejecta became fainter, slower, less frequent, and less energetic, before the emission transitioned (over 1-2 d) to being dominated by a compact jet, as the outburst decayed towards quiescence. While the broad-band spectrum of this compact jet showed very little evolution throughout the outburst decay (with the optically thick to thin synchrotron jet spectral break residing in the near-infrared/optical bands; ∼2-5 × 1014 Hz), the emission still remained intermittently variable at mm/sub-mm frequencies. Additionally, we present a comparison between the radio jet emission throughout the 2015 and previous 1989 outbursts, confirming that the radio emission in the 2015 outburst decayed significantly faster than in 1989. Lastly, we detail our sub-mm observations taken during the 2015 December mini-outburst of V404 Cygni, which demonstrate that, similar to the main outburst, the source was likely launching jet ejecta during this short period of renewed activity. 2019 Journal Article http://hdl.handle.net/20.500.11937/80177 10.1093/mnras/sty2853 English http://purl.org/au-research/grants/arc/FT140101082 OXFORD UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics black hole physics stars: individual (V404 Cygni, GS 2023+338) ISM: jets and outflows radio continuum: stars submillmetre: stars X-rays: binaries X-RAY BINARIES TRANSIENT GS 2023+338 BROAD-BAND SPECTRUM HARD STATE SYNCHROTRON EMISSION MULTIPLE EJECTIONS RELATIVISTIC JETS ACCRETION DISC RADIO-EMISSION MINI-OUTBURSTS Tetarenko, A.J. Sivakoff, G.R. Miller-Jones, James Bremer, M. Mooley, K.P. Fender, R.P. Rumsey, C. Bahramian, Arash Altamirano, D. Heinz, S. Maitra, D. Markoff, S.B. Migliari, S. Rupen, M.P. Russell, D.M. Russell, T.D. Sarazin, C.L. Tracking the variable jets of V404 Cygni during its 2015 outburst |
| title | Tracking the variable jets of V404 Cygni during its 2015 outburst |
| title_full | Tracking the variable jets of V404 Cygni during its 2015 outburst |
| title_fullStr | Tracking the variable jets of V404 Cygni during its 2015 outburst |
| title_full_unstemmed | Tracking the variable jets of V404 Cygni during its 2015 outburst |
| title_short | Tracking the variable jets of V404 Cygni during its 2015 outburst |
| title_sort | tracking the variable jets of v404 cygni during its 2015 outburst |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics black hole physics stars: individual (V404 Cygni, GS 2023+338) ISM: jets and outflows radio continuum: stars submillmetre: stars X-rays: binaries X-RAY BINARIES TRANSIENT GS 2023+338 BROAD-BAND SPECTRUM HARD STATE SYNCHROTRON EMISSION MULTIPLE EJECTIONS RELATIVISTIC JETS ACCRETION DISC RADIO-EMISSION MINI-OUTBURSTS |
| url | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/80177 |