No Evidence of Intrinsic Optical/Near-Infrared Linear Polarization for V404 Cygni During Its Bright Outburst in 2015: Broadband Modeling and Constraint on Jet Parameters

Tanaka, Yasuyuki; Itoh, R.; Uemura, Makoto; Inoue, Yoshiyuki; Cheung, C. C.; Watanabe, Makoto; Kawabata, Koji S.; Fukazawa, Yasushi; Yatsu, Yoichi; Yoshii, T.; Tachibana, Y.; Fujiwara, Taketomo; Saito, Yoshihiko; Kawai, N.; Kimura, M.; Isogai, Keisuke; Katô, Takeo; Akitaya, Hiroshi; Nakaoka, Tatsuya; Shiki, Kensei; Takaki, K.; Yoshida, Michitoshi; Imaï, Masataka; Gouda, S.; Gouda, Yuya; Akimoto, Hinako; Honda, Satoshi; Hosoya, Kensuke; Ikebe, A.; Morihana, K.; Ohshima, Tomohito; Takagi, Y.; Takahashi, Jun; Watanabe, Kazuho; Kuroda, D.; Morokuma, Tomoki; Murata, Katsuhiro L.; Nagayama, Takahiro; Nogami, Daisaku; Oasa, Yumiko; Sekiguchi, K.

doi:10.3847/0004-637x/823/1/35

Cited by 20 publications

(26 citation statements)

References 38 publications

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“…Infrared polarization has now been detected from several quiescent, outbursting, and persistently accreting black hole binaries, lending credence to this expectation (Russell & Fender 2008;Russell & Shahbaz 2014;Russell et al 2016;Chaty, Dubus, & Raichoor 2011). Unfortunately, here too the observational evidence is equivocal with some studies finding variable polarization, and others not, and characteristics that may be more consistent with scattering in a disc outflow rather than from jet synchrotron emission (Tanaka et al 2016;Lipunov et al 2016;Shahbaz et al 2016;Itoh et al 2017;Kosenkov et al 2017).…”

Section: Are Slow Variations Driven By Plasmon Ejections or Disc Irramentioning

confidence: 92%

Optical and X-ray correlations during the 2015 outburst of the black hole V404 Cyg

Hynes

Robinson

Terndrup

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We present a serendipitous multiwavelength campaign of optical photometry simultaneous with Integral X-ray monitoring of the 2015 outburst of the black hole V404 Cyg. Large amplitude optical variability is generally correlated with X-rays, with lags of order a minute or less compatible with binary light travel timescales or jet ejections. Rapid optical flaring on time-scales of seconds or less is incompatible with binary lighttravel timescales and has instead been associated with synchrotron emission from a jet. Both this rapid jet response and the lagged and smeared one can be present simultaneously. The optical brightness is not uniquely determined by the X-ray brightness, but the X-ray/optical relationship is bounded by a lower-envelope such that at any given optical brightness there is a maximum X-ray brightness seen. This lowerenvelope traces out a F opt ∝ F 0.54 X relation which can be approximately extrapolated back to quiescence. Rapid optical variability is only seen near this envelope, and these periods correspond to the hardest hard X-ray colours. This correlation between hard X-ray colour and optical variability (and anti-correlation with optical brightness) is a novel finding of this campaign, and apparently a facet of the outburst behaviour in V404 Cyg. It is likely that these correlations are driven by changes in the central accretion rate and geometry.

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Section: Are Slow Variations Driven By Plasmon Ejections or Disc Irramentioning

confidence: 92%

Optical and X-ray correlations during the 2015 outburst of the black hole V404 Cyg

Hynes

Robinson

Terndrup

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…These changes in the optical spectra led Muñoz-Darias et al (2016) to suggest that a short-lived nebular phase was triggered around this time. Tanaka et al (2016) observed V404 Cyg at various epochs between MJD 57190-57194 and did not find any evidence of intrinsic optical or NIR linear polarization, or any significant change in the amount of polarization or the polarization position angle. However, observations made between MJD 57191.62-57191.84 using the MASTER robotic telescope network showed a 4%-6% change in the optical linear polarization (Lipunov et al 2016).…”

mentioning

confidence: 87%

Simultaneous Multiwavelength Observations of V404 Cygni during its 2015 June Outburst Decay Strengthen the Case for an Extremely Energetic Jet-base

Maitra

Scarpaci

Grinberg

et al. 2017

ApJ

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We present results of multiband optical photometry of the black hole X-ray binary system V404 Cyg obtained using Wheaton College Observatory's 0.3m telescope, along with strictly simultaneous INTEGRAL and Swift observations during 2015 June 25.15-26.33 UT, and 2015 June 27.10-27.34 UT. These observations were made during the 2015 June outburst of the source when it was going through an epoch of violent activity in all wavelengths ranging from radio to γ-rays. The multiwavelength variability timescale favors a compact emission region, most likely originating in a jet outflow, for both observing epochs presented in this work. The simultaneous INTEGRAL/Imager on Board the Integral Satellite (IBIS) 20-40 keV light curve obtained during the June 27 observing run correlates very strongly with the optical light curve, with no detectable delay between the optical bands as well as between the optical and hard X-rays. The average slope of the dereddened spectral energy distribution was roughly flat between the I C -and V -bands during the June 27 run, even though the optical and X-ray flux varied by >25× during the run, ruling out an irradiation origin for the optical and suggesting that the optically thick to optically thin jet synchrotron break during the observations was at a frequency larger than that of V -band, which is quite extreme for X-ray binaries. These observations suggest that the optical emission originated very close to the base of the jet. A strong Hα emission line, probably originating in a quasi-spherical nebula around the source, also contributes significantly in the R C -band. Our data, in conjunction with contemporaneous data at other wavelengths presented by other groups, strongly suggest that the jet-base was extremely compact and energetic during this phase of the outburst.

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“…A lack of optical and near-infrared polarisation was reported by Tanaka et al (2016) in two periods during the outburst. There was, however, evidence of a strong contribution of synchrotron emission related to jet ejections in some other epochs (Rodriguez et al 2015;Martí et al 2016;Shahbaz et al 2016;Lipunov et al 2016;Bernardini et al 2016b).…”

Section: Introductionmentioning

confidence: 99%

“…During the 1989 outburst, short-term X-ray variability was observed (e.g., Życki et al 1999). On June 15th in 2015, it underwent a short outburst after 26 years of quiescence (Barthelmy et al 2015a) and showed large flares in radio (Mooley et al 2015;Tetarenko et al 2015), infrared (Tanaka et al 2016), optical (Rodriguez et al 2015;Martí et al 2016;Gandhi et al 2016), X-ray (King et al 2015;Natalucci et al 2015;Negoro et al 2015;Segreto et al 2015;Walton et al 2017;Radhika et al 2016;Jourdain et al 2017;Huppenkothen et al 2017) and gamma-ray wavelengths (Roques & Jourdain 2016;Siegert et al 2016;Jenke et al 2016;Loh et al 2016;Piano et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Rapid optical variations correlated with X-rays in the 2015 second outburst of V404 Cygni (GS 2023+338)

Kimura

Katô

Isogai

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present optical multi-colour photometry of V404 Cyg during the outburst from December, 2015 to January, 2016 together with the simultaneous X-ray data. This outburst occurred less than 6 months after the previous outburst in June-July, 2015. These two outbursts in 2015 were of a slow rise and rapid decay-type and showed large-amplitude (∼2 mag) and short-term (∼10 min-3 hours) optical variations even at low luminosity (0.01-0.1L Edd ). We found correlated optical and X-ray variations in two ∼1 hour time intervals and obtained a Bayesian estimate of an X-ray delay against the optical emission, which is ∼30-50 s, during those two intervals. In addition, the relationship between the optical and X-ray luminosity was L opt ∝ L 0.25−0.29 X at that time. These features cannot be easily explained by the conventional picture of transient black-hole binaries, such as canonical disc reprocessing and synchrotron emission related to a jet. We suggest that the disc was truncated during those intervals and that the X-ray delays represent the required time for propagation of mass accretion flow to the inner optically-thin region with a speed comparable to the free-fall velocity.

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No Evidence of Intrinsic Optical/Near-Infrared Linear Polarization for V404 Cygni During Its Bright Outburst in 2015: Broadband Modeling and Constraint on Jet Parameters

Cited by 20 publications

References 38 publications

Optical and X-ray correlations during the 2015 outburst of the black hole V404 Cyg

Optical and X-ray correlations during the 2015 outburst of the black hole V404 Cyg

Simultaneous Multiwavelength Observations of V404 Cygni during its 2015 June Outburst Decay Strengthen the Case for an Extremely Energetic Jet-base

Rapid optical variations correlated with X-rays in the 2015 second outburst of V404 Cygni (GS 2023+338)

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