A search for extragalactic fast optical transients in the Tomo-e Gozen high-cadence survey

DOI DOI PDF 被引用文献1件 参考文献71件 オープンアクセス
  • Kakeru Oshikiri
    Astronomical Institute, Tohoku University , Aoba, Sendai 980-8578 , Japan
  • Masaomi Tanaka
    Astronomical Institute, Tohoku University , Aoba, Sendai 980-8578 , Japan
  • Nozomu Tominaga
    National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588 , Japan
  • Tomoki Morokuma
    Planetary Exploration Research Center, Chiba Institute of Technology , 2-17-1 Tsudanuma, Narashino, Chiba 275-0016 , Japan
  • Ichiro Takahashi
    School of Science, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 , Japan
  • Yusuke Tampo
    Department of Astronomy, Kyoto University , Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502 , Japan
  • Hamid Hamidani
    Astronomical Institute, Tohoku University , Aoba, Sendai 980-8578 , Japan
  • Noriaki Arima
    Institute of Astronomy, Graduate School of Science, The University of Tokyo , 2-21-1 Osawa, Mitaka, Tokyo 181-0015 , Japan
  • Ko Arimatsu
    Hakubi Center / Astronomical Observatory, Graduate School of Science, Kyoto University , Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502 , Japan
  • Toshihiro Kasuga
    National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588 , Japan
  • Naoto Kobayashi
    Kiso Observatory, Institute of Astronomy, Graduate School of Science, The University of Tokyo , 10762-30 Mitake, Kiso-machi, Kiso-gun, Nagano 397-0101 , Japan
  • Sohei Kondo
    Kiso Observatory, Institute of Astronomy, Graduate School of Science, The University of Tokyo , 10762-30 Mitake, Kiso-machi, Kiso-gun, Nagano 397-0101 , Japan
  • Yuki Mori
    Kiso Observatory, Institute of Astronomy, Graduate School of Science, The University of Tokyo , 10762-30 Mitake, Kiso-machi, Kiso-gun, Nagano 397-0101 , Japan
  • Yuu Niino
    Kiso Observatory, Institute of Astronomy, Graduate School of Science, The University of Tokyo , 10762-30 Mitake, Kiso-machi, Kiso-gun, Nagano 397-0101 , Japan
  • Ryou Ohsawa
    National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588 , Japan
  • Shin-ichiro Okumura
    Japan Spaceguard Association, Bisei Spaceguard Center , 1716-3 Okura, Bisei, Ibara, Okayama 714-1411 , Japan
  • Shigeyuki Sako
    Institute of Astronomy, Graduate School of Science, The University of Tokyo , 2-21-1 Osawa, Mitaka, Tokyo 181-0015 , Japan
  • Hidenori Takahashi
    Kiso Observatory, Institute of Astronomy, Graduate School of Science, The University of Tokyo , 10762-30 Mitake, Kiso-machi, Kiso-gun, Nagano 397-0101 , Japan

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<jats:title>ABSTRACT</jats:title> <jats:p>The population of optical transients evolving within a time-scale of a few hours or a day (so-called fast optical transients, FOTs) has recently been debated extensively. In particular, our understanding of extragalactic FOTs and their rates is limited. We present a search for extragalactic FOTs with the Tomo-e Gozen high-cadence survey. Using the data taken from 2019 August to 2022 June, we obtain 113 FOT candidates. Through light curve analysis and cross-matching with other survey data, we find that most of these candidates are in fact supernovae, variable quasars, and Galactic dwarf novae that were partially observed around their peak brightness. We find no promising candidate of extragalactic FOTs. From this non-detection, we obtain upper limits on the event rate of extragalactic FOTs as a function of their time-scale. For a very luminous event (absolute magnitude M &lt; −26 mag), we obtain the upper limits of 4.4 × 10−9 Mpc−3 yr−1 for a time-scale of 4 h, and 7.4 × 10−10 Mpc−3 yr−1 for a time-scale of 1 d. Thanks to our wide (although shallow) surveying strategy, our data are less affected by the cosmological effects, and thus, give one of the more stringent limits to the event rate of intrinsically luminous transients with a time-scale of &lt;1 d.</jats:p>

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