Giant Metrewave Radio Telescope Monitoring of the Black Hole X-Ray Binary, V404 Cygni during Its 2015 June Outburst

Chandra, Poonam; Kanekar, Nissim

doi:10.3847/1538-4357/aa85a2

Cited by 25 publications

(19 citation statements)

References 36 publications

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“…Limited jet spectral evolution may suggest that the jet properties are not changing significantly as the jet emission fades during these epochs (e.g., the jet spectral shape can be sensitive to many parameters, such as the magnetic field strength at the base of the jet, jet geometry, inclination of the system, the particle acceleration process, and the electron energy distribution injected into the jets; Pe'er & Casella 2009;Kaiser 2006;Jamil et al 2010;Malzac 2014). Interestingly, Chandra & Kanekar 2017 have reported the detection of a spectral break in the radio band at ν break = 1.8 GHz on MJD 57199/57200. This finding is consistent with our previous work (Tetarenko et al 2017), where we found evidence of a compact jet with a spectral break between 0.341 < ν break < 5.25 GHz on MJD 57195.…”

Section: Compact Jet Behaviourmentioning

confidence: 99%

Tracking the variable jets of V404 Cygni during its 2015 outburst

Tetarenko

Sivakoff

Miller-Jones

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We present multi-frequency monitoring observations of the black hole X-ray binary V404 Cygni throughout its June 2015 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 days) to being dominated by a compact jet, as the outburst decayed toward 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 × 10 14 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 December 2015 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.

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Section: Compact Jet Behaviourmentioning

confidence: 99%

Tracking the variable jets of V404 Cygni during its 2015 outburst

Tetarenko

Sivakoff

Miller-Jones

et al. 2018

Monthly Notices of the Royal Astronomical Society

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“…The details of the GMRT observations and the flux density values can be found in Table 3.2. For carrying out the fitting and analysis, we add 10% uncertainty in quadrature, a typical calibration uncertainty in the GMRT data (Chandra & Kanekar 2017).…”

Section: Early Classification Of Sn 2001emmentioning

confidence: 99%

Supernova Interaction with a Dense Detached Shell in SN 2001em

Chandra,

Chevalier,

Chugai

et al. 2020

Preprint

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We carry out a comprehensive analysis of supernova SN 2001em covering a period of 19 years since discovery. SN 2001em is the oldest supernova known to have undergone a metamorphosis from a stripped envelope to an interacting supernova. An early spectrum indicates it exploded as a Type Ib supernova. Later, the ejecta caught up with a dense circumstellar H-shell, ejected a few thousand years before the explosion, triggering interaction between the supernova ejecta and the dense shell, producing radio, X-ray and Hα emission. We use archival data with the Very Large Array in radio bands and with Chandra, XMM-Newton and Swift-XRT in X-ray bands, along with published Hα measurements. We combine these data with our low radio frequency observations with the Giant Metrewave Radio Telescope at two epochs covering three frequencies. While the observations missed the phase when the shock entered the dense shell, the X-rays indicate that the shock came out of the dense shell at around 1750 days. The data suggest a forward shock origin of the X-ray emission. Radio data show a spectral inversion at late epochs (> 5000 d) at around 3 GHz, which mimics the properties of the central absorbed component seen in SN 1986J. A possible explanation for this component is that the progenitor of SN 2001em was a massive binary system which had undergone a period of common envelope evolution.

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“…Closer to the peak of the outburst, X-ray binaries generate brighter, transient, relativistically-moving jets, which provide the best prospects for detection (e.g., Broderick et al, 2015;Chandra & Kanekar, 2017). It is well established that standard expanding synchrotron bubble models (e.g., van der Laan, 1966) cannot explain the observed spectra and evolution of these transient jets (e.g., Broderick et al, 2018).…”

Section: X-ray Binariesmentioning

confidence: 99%

Science with the Murchison Widefield Array: Phase I results and Phase II opportunities

Beardsley

Johnston‐Hollitt

Trott

et al. 2019

Publ. Astron. Soc. Aust.

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The Murchison Widefield Array (MWA) is an open access telescope dedicated to studying the low frequency (80-300 MHz) southern sky. Since beginning operations in mid 2013, the MWA has opened a new observational window in the southern hemisphere enabling many science areas. The driving science objectives of the original design were to observe 21 cm radiation from the Epoch of Reionisation (EoR), explore the radio time domain, perform Galactic and extragalactic surveys, and monitor solar, heliospheric, and ionospheric phenomena. All together 60+ programs recorded 20,000 hours producing 146 papers to date. In 2016 the telescope underwent a major upgrade resulting in alternating compact and extended configurations. Other upgrades, including digital back-ends and a rapid-response triggering system, have been developed since the original array was commissioned. In this paper we review the major results from the prior operation of the MWA, and then discuss the new science paths enabled by the improved capabilities. We group these science opportunities by the four original science themes, but also include ideas for directions outside these categories.

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Giant Metrewave Radio Telescope Monitoring of the Black Hole X-Ray Binary, V404 Cygni during Its 2015 June Outburst

Cited by 25 publications

References 36 publications

Tracking the variable jets of V404 Cygni during its 2015 outburst

Tracking the variable jets of V404 Cygni during its 2015 outburst

Supernova Interaction with a Dense Detached Shell in SN 2001em

Science with the Murchison Widefield Array: Phase I results and Phase II opportunities

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