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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
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
Astrophysical Journal, Volume 823, No. 1, Article 35, Year 2016
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Description
We present simultaneous optical and near-infrared (NIR) polarimetric results for the black hole binary V404 Cyg spanning the duration of its seven-day-long optically brightest phase of its 2015 June outburst. The simultaneous R- and K s-band light curves showed almost the same temporal variation except for the isolated (∼30-minute duration) orphan K s-band flare observed at MJD 57193.54. We did not find any significant temporal variation of polarization degree (PD) and position angle (PA) in both R and K s bands throughout our observations, including the duration of the orphan NIR flare. We show that the observed PD and PA are predominantly interstellar in origin by comparing the V404 Cyg polarimetric results with those of the surrounding sources within the 7′ × 7′ field of view. The low intrinsic PD (less than a few percent) implies that the optical and NIR emissions are dominated by either disk or optically thick synchrotron emission, or both. We also present the broadband spectra of V404 Cyg during the orphan NIR flare and a relatively faint and steady state by including quasi-simultaneous Swift/XRT and INTEGRAL fluxes. By adopting a single-zone synchrotron plus inverse-Compton model as widely used in modeling of blazars, we constrained the parameters of a putative jet. Because the jet synchrotron component cannot exceed the Swift/XRT disk/corona flux, the cutoff Lorentz factor in the electron energy distribution is constrained to be <102, suggesting that particle acceleration is less efficient in this microquasar jet outburst compared to active galactic nucleus jets. We also suggest that the loading of the baryon component inside the jet is inevitable based on energetic arguments. © 2016. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Tanaka, Yasuyuki T.
Japan, Higashihiroshima
Hiroshima University
Itoh, Ryosuke
Japan, Higashihiroshima
Hiroshima University
Uemura, Makoto
Japan, Higashihiroshima
Hiroshima University
Cheung, Chi C.Teddy
United States, Washington, D.c.
U.s. Naval Research Laboratory
Watanabe, Makoto
Japan, Sapporo
Hokkaido University
Kawabata, Koji S.
Japan, Higashihiroshima
Hiroshima University
Fukazawa, Yasushi
Japan, Higashihiroshima
Hiroshima University
Yatsu, Yoichi
Japan, Tokyo
Tokyo Institute of Technology
Yoshii, Taketoshi
Japan, Tokyo
Tokyo Institute of Technology
Tachibana, Yutaro
Japan, Tokyo
Tokyo Institute of Technology
Saito, Yoshihiko
Japan, Tokyo
Tokyo Institute of Technology
Kawai, Nobuyuki
Japan, Tokyo
Tokyo Institute of Technology
Kimura, Mariko
Japan, Kyoto
Kyoto University
Isogai, Keisuke I.
Japan, Kyoto
Kyoto University
Kato, Taichi
Japan, Kyoto
Kyoto University
Akitaya, Hiroshi
Japan, Higashihiroshima
Hiroshima University
Kawabata, Miho
Japan, Higashihiroshima
Hiroshima University
Nakaoka, Tatsuya
Japan, Higashihiroshima
Hiroshima University
Kensei, Shiki
Japan, Higashihiroshima
Hiroshima University
Takaki, Katsutoshi
Japan, Higashihiroshima
Hiroshima University
Yoshida, Michitoshi
Japan, Higashihiroshima
Hiroshima University
Imai, Masataka
Japan, Sapporo
Hokkaido University
Gouda, Yuya
Japan, Sapporo
Hokkaido University
Akimoto, Hinako
Japan, Kobe
University of Hyogo
Honda, Satoshi
Japan, Kobe
University of Hyogo
Morihana, Kumiko
Japan, Kobe
University of Hyogo
Ohshima, Tomohito
Japan, Kobe
University of Hyogo
Takagi, Yuhei
Japan, Kobe
University of Hyogo
Takahashi, Jun
Japan, Kobe
University of Hyogo
Kuroda, Daisuke
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Morokuma, Tomoki
Japan, Tokyo
The University of Tokyo
Murata, Katsuhiro L.
Japan, Nagoya
Nagoya University
Nagayama, Takahiro
Japan, Kagoshima
Kagoshima University
Nogami, Daisaku
Japan, Kyoto
Kyoto University
Oasa, Yumiko
Japan, Saitama
Saitama University
Sekiguchi, Kazuhiro
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Statistics
Citations: 20
Authors: 36
Affiliations: 12
Identifiers
Doi:
10.3847/0004-637X/823/1/35
ISSN:
0004637X
Research Areas
Environmental