Abstract
We report the first detection of radio polarization of a gamma-ray burst (GRB) afterglow with the first intensive combined use of telescopes in the millimeter and submillimeter ranges for GRB 171205A. The linear polarization degree in the millimeter band at the subpercent level (0.27% 0.04%) is lower than those observed in late-time optical afterglows (weighted average of ∼1%). The Faraday depolarization by nonaccelerated, cool electrons in the shocked region is one of the possible mechanisms for the low value. This scenario requires a total energy that is larger by a factor of ∼10 than ordinary estimates without considering nonaccelerated electrons. The polarization position angle varies by at least 20 across the millimeter band, which is not inconsistent with this scenario. This result indicates that polarimetry in the millimeter and submillimeter ranges is a unique tool for investigating GRB energetics, and coincident observations with multiple frequencies or bands would provide more accurate measurements of the nonaccelerated electron fraction.
| Original language | English |
|---|---|
| Article number | L58 |
| Journal | Astrophysical Journal Letters |
| Volume | 884 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2019 Oct 20 |
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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First Detection of Radio Linear Polarization in a Gamma-Ray Burst Afterglow. / Urata, Yuji; Toma, Kenji; Huang, Kuiyun; Asada, Keiichi; Nagai, Hiroshi; Takahashi, Satoko; Petitpas, Glen; Tashiro, Makoto; Yamaoka, Kazutaka.
In: Astrophysical Journal Letters, Vol. 884, No. 2, L58, 20.10.2019.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - First Detection of Radio Linear Polarization in a Gamma-Ray Burst Afterglow
AU - Urata, Yuji
AU - Toma, Kenji
AU - Huang, Kuiyun
AU - Asada, Keiichi
AU - Nagai, Hiroshi
AU - Takahashi, Satoko
AU - Petitpas, Glen
AU - Tashiro, Makoto
AU - Yamaoka, Kazutaka
N1 - Funding Information: Yuji Urata Kenji Toma Kuiyun Huang Keiichi Asada Hiroshi Nagai Satoko Takahashi Glen Petitpas Makoto Tashiro Kazutaka Yamaoka Yuji Urata Kenji Toma Kuiyun Huang Keiichi Asada Hiroshi Nagai Satoko Takahashi Glen Petitpas Makoto Tashiro Kazutaka Yamaoka Institute of Astronomy, National Central University, Chung-Li 32054, Taiwan Frontier Research Institute for Interdisciplinary Sciences, Tohoku University Sendai 980-8578, Japan Astronomical Institute, Tohoku University, Sendai, 980-8578, Japan Center for General Education, Chung Yuan Christian University, Taoyuan 32023, Taiwan Academia Sinica Institute of Astronomy and Astrophysics, Taipei 106, Taiwan National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka Tokyo 181-8588, Japan Department of Astronomical Science, School of Physical Sciences, SOKENDAI (The Graduate University for Advanced Studies), Mitaka, Tokyo 181-8588, Japan Joint ALMA Observatory, Alonso de Cordova 3108, Vitacura, Santiago, Chile NAOJ Chile Observatory, Alonso de Cordova 3788, Oficina 61B, Vitacura, Santiago, Chile Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138, USA Department of Physics, Saitama University, Shimo-Okubo, Saitama 338-8570, Japan Institute for Space-Earth Environmental Research (ISEE), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan Division of Particle and Astrophysical Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan Yuji Urata, Kenji Toma, Kuiyun Huang, Keiichi Asada, Hiroshi Nagai, Satoko Takahashi, Glen Petitpas, Makoto Tashiro and Kazutaka Yamaoka 2019-10-20 2019-10-21 13:20:12 cgi/release: Article released bin/incoming: New from .zip MOST MOST 105-2112-M-008-013-MY3 yes We report the first detection of radio polarization of a gamma-ray burst (GRB) afterglow with the first intensive combined use of telescopes in the millimeter and submillimeter ranges for GRB 171205A. The linear polarization degree in the millimeter band at the subpercent level (0.27%���0.04%) is lower than those observed in late-time optical afterglows (weighted average of ∼1%). The Faraday depolarization by nonaccelerated, cool electrons in the shocked region is one of the possible mechanisms for the low value. This scenario requires a total energy that is larger by a factor of ∼10 than ordinary estimates without considering nonaccelerated electrons. The polarization position angle varies by at least 20� across the millimeter band, which is not inconsistent with this scenario. This result indicates that polarimetry in the millimeter and submillimeter ranges is a unique tool for investigating GRB energetics, and coincident observations with multiple frequencies or bands would provide more accurate measurements of the nonaccelerated electron fraction. � 2019. The American Astronomical Society. All rights reserved. Abbott B. P., Abbott R., Abbott T. 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All rights reserved.
PY - 2019/10/20
Y1 - 2019/10/20
N2 - We report the first detection of radio polarization of a gamma-ray burst (GRB) afterglow with the first intensive combined use of telescopes in the millimeter and submillimeter ranges for GRB 171205A. The linear polarization degree in the millimeter band at the subpercent level (0.27% 0.04%) is lower than those observed in late-time optical afterglows (weighted average of ∼1%). The Faraday depolarization by nonaccelerated, cool electrons in the shocked region is one of the possible mechanisms for the low value. This scenario requires a total energy that is larger by a factor of ∼10 than ordinary estimates without considering nonaccelerated electrons. The polarization position angle varies by at least 20 across the millimeter band, which is not inconsistent with this scenario. This result indicates that polarimetry in the millimeter and submillimeter ranges is a unique tool for investigating GRB energetics, and coincident observations with multiple frequencies or bands would provide more accurate measurements of the nonaccelerated electron fraction.
AB - We report the first detection of radio polarization of a gamma-ray burst (GRB) afterglow with the first intensive combined use of telescopes in the millimeter and submillimeter ranges for GRB 171205A. The linear polarization degree in the millimeter band at the subpercent level (0.27% 0.04%) is lower than those observed in late-time optical afterglows (weighted average of ∼1%). The Faraday depolarization by nonaccelerated, cool electrons in the shocked region is one of the possible mechanisms for the low value. This scenario requires a total energy that is larger by a factor of ∼10 than ordinary estimates without considering nonaccelerated electrons. The polarization position angle varies by at least 20 across the millimeter band, which is not inconsistent with this scenario. This result indicates that polarimetry in the millimeter and submillimeter ranges is a unique tool for investigating GRB energetics, and coincident observations with multiple frequencies or bands would provide more accurate measurements of the nonaccelerated electron fraction.
UR - http://www.scopus.com/inward/record.url?scp=85075451389&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85075451389&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/ab48f3
DO - 10.3847/2041-8213/ab48f3
M3 - Article
AN - SCOPUS:85075451389
VL - 884
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L58
ER -