Multi-frequency radio observations of the radio-loud magnetar XTE J1810−197

Author:

Eie Sujin12ORCID,Terasawa Toshio2ORCID,Akahori Takuya23ORCID,Oyama Tomoaki2ORCID,Hirota Tomoya24ORCID,Yonekura Yoshinori5ORCID,Enoto Teruaki6ORCID,Sekido Mamoru7ORCID,Takefuji Kazuhiro78ORCID,Misawa Hiroaki9ORCID,Tsuchiya Fuminori9ORCID,Kisaka Shota101112ORCID,Aoki Takahiro13ORCID,Honma Mareki124ORCID

Affiliation:

1. Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

2. Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

3. SKA Organization, Jodrell Bank, Lower Withington, Macclesfield, SK11 9DL, UK

4. Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

5. Center for Astronomy, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan

6. Extreme Natural Phenomena RIKEN Hakubi Research Team, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

7. Kashima Space Technology Center, National Institute of Information and Communications Technology, 893-1 Hirai, Kashima, Ibaraki 314-8501, Japan

8. Japan Aerospace Exploration Agency, Usuda Deep Space Center, 1831-6 Oomagari, Kamiodagiri, Saku, Nagano 384-0306, Japan

9. Planetary Plasma and Atmospheric Research Center, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan

10. Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan

11. Astronomical Institute, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan

12. Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

13. The Research Institute for Time Studies, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8511, Japan

Abstract

Abstract We report on the multi-frequency multi-epoch radio observations of the magnetar XTE J1810−197, which exhibited a radio outburst from 2018 December after its 10-year quiescent period. We performed quasi-simultaneous observations with VERA (22 GHz), Hitachi (6.9 GHz and 8.4 GHz), Kashima (2.3 GHz), and Iitate (0.3 GHz) radio telescopes located in Japan to trace the variability of the magnetar radio pulsations during the observing period from 2018 December 13 to 2019 June 12. The pulse width becomes narrower as the observing frequency goes higher, analogous to the general profile narrowing behavior of ordinary pulsars. When assuming a simple power law in the range of 2.3 GHz and 8.7 GHz, the radio spectrum of the magnetar goes steeper with the average spectral index 〈α〉 ≈ −0.85 for the first four months. The wide-band radio spectra gathered from our observations and the literature suggest that XTE J1810−197 would have a double-peaked spectrum with a valley point in 22–150 GHz, where the first spectral peak implies a gigahertz-peaked spectrum (GPS) feature with a peak at a few GHz. The GPS and the high-frequency peak have been identified in the spectra of other radio-loud magnetars, thus they may be intrinsic features that can give a new insight to the understanding of various emission mechanisms and the surrounding environments of radio magnetars. Our study emphasizes the importance of simultaneous long-term broad-band observations toward radio-loud magnetars to capture the puzzling spectral features and establish a link to other types of neutron stars.

Funder

National Astronomical Observatory of Japan

Japan Society for the Promotion of Science

Ministry of Education, Culture, Sports, Science and Technology

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 7 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Simultaneous 2.25/8.60 GHz Observations of the Magnetar XTE J1810-197;The Astrophysical Journal;2023-10-01

2. Simultaneous radio and X-ray observations of the magnetar Swift J1818.0−1607;Monthly Notices of the Royal Astronomical Society;2023-05-24

3. Evolutionary implications of a magnetar interpretation for GLEAM-X J162759.5–523504.3;Monthly Notices of the Royal Astronomical Society;2023-01-25

4. Detection of a bright burst from the repeating fast radio burst 20201124A at 2 GHz;Publications of the Astronomical Society of Japan;2023-01-11

5. Magnetar XTE J1810–197: Spectro-temporal Evolution of Average Radio Emission;The Astrophysical Journal;2022-05-01

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