Follow-up observations for IceCube-170922A: Detection of rapid near-infrared variability and intensive monitoring of TXS 0506+056-Reference-Cited by-同舟云学术

Follow-up observations for IceCube-170922A: Detection of rapid near-infrared variability and intensive monitoring of TXS 0506+056

Published:2021-01-22 Issue:1 Volume:73 Page:25-43
ISSN:0004-6264
Container-title:Publications of the Astronomical Society of Japan
language:en
Short-container-title:

Author:

Morokuma Tomoki¹^ORCID,Utsumi Yousuke²^ORCID,Ohta Kouji³,Yamanaka Masayuki⁴^ORCID,Kawabata Koji S⁵^ORCID,Inoue Yoshiyuki⁶⁷⁸^ORCID,Tanaka Masaomi⁹^ORCID,Yoshida Michitoshi¹⁰^ORCID,Itoh Ryosuke¹¹,Sasada Mahito⁵,Tominaga Nozomu¹²⁸^ORCID,Mori Hiroki¹³,Kawabata Miho³^ORCID,Nakaoka Tatsuya⁵,Chogi Maiko¹³,Abe Taisei¹³,Huang Ruochen¹³,Kawahara Naoki¹³,Kimura Hiroki¹³,Nagashima Hiroki¹³,Takagi Kengo¹³,Yamazaki Yuina¹³,Liu Wei¹⁴¹⁵⁵,Ohsawa Ryou¹^ORCID,Sako Shigeyuki¹^ORCID,Murata Katsuhiro L¹⁶,Morihana Kumiko¹⁷¹⁸,Gilligan Christina K¹⁹^ORCID,Isogai Keisuke⁴,Kimura Mariko³²⁰,Wakamatsu Yasuyuki³,Ohnishi Ryuhei³,Takayama Masaki²¹,Honda Satoshi²¹,Matsuoka Yoshiki²²,Yamashita Takuji²²²³^ORCID,Nagataki Shigehiro⁷²⁴,Tanaka Yasuyuki T⁵

Affiliation:

1. Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan

2. Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA

3. Department of Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan

4. Okayama Observatory, Kyoto University, 3037-5 Honjo, Kamogata-cho, Asakuchi, Okayama 719-0232, Japan

5. Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

6. Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan

7. Interdisciplinary Theoretical & Mathematical Science Program (iTHEMS), RIKEN, 2-1 Hirosawa, Saitama 351-0198, Japan

8. Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan

9. Astronomical Institute, Tohoku University, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan

10. Subaru Telescope, National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 650 North A’ohoku Place, Hilo, HI 96720, USA

11. Bisei Astronomical Observatory, 1723-70 Okura, Bisei, Ibara, Okayama 714-1411, Japan

12. Department of Physics, Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Kobe, Hyogo 658-8501, Japan

13. Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

14. Purple Mountain Observatory, Chinese Academy of Sciences, No. 10 Yuanhua Road, Qixia District, Nanjing, 210023, China

15. Key Laboratory for Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, China

16. Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan

17. Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8602, Japan

18. Institute of Liberal Arts and Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan

19. Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03784, USA

20. Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

21. Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, 407-2 Nishigaichi, Sayo-cho, Sayo, Hyogo 679-5313, Japan

22. Research Center for Space and Cosmic Evolution, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan

23. National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

24. Astrophysical Big Bang Laboratory (ABBL), RIKEN Cluster for Pioneering Research, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Abstract

Abstract We present our follow-up observations to search for an electromagnetic counterpart of the IceCube high-energy neutrino IceCube-170922A. Monitoring observations of a likely counterpart, TXS 0506+056, are also described. First, we quickly took optical and near-infrared images of seven flat-spectrum radio sources within the IceCube error region right after the neutrino detection and found a rapid flux decline of TXS 0506+056 in Kanata/HONIR J-band data. Motivated by this discovery, intensive follow-up observations of TXS 0506+056 were continuously performed, including our monitoring imaging observations, spectroscopic observations, and polarimetric observations in optical and near-infrared wavelengths. TXS 0506+056 showed a large-amplitude (∼1.0 mag) variability in a time scale of several days or longer, although no significant variability was detected in a time scale of a day or shorter. TXS 0506+056 also showed a bluer-when-brighter trend in optical and near-infrared wavelengths. Structure functions of the variabilities were examined and indicate that TXS 0506+056 is not a special blazar in terms of optical variability. Polarization measurement results of TXS 0506+056 are also discussed.

Funder

Optical and Near-infrared Astronomy Inter-University Cooperation Program

Ministry of Education, Science, Culture, and Sport Nos.

Institute for Cosmic Ray Research

National Astronomical Observatory of Japan

JSPS

National Science Foundation

Nagoya University

SAAO

Ministry of Education, Culture, Sports, Science and Technology

National Research Foundation

National Aeronautics and Space Administration