The Milky Way tomography with Subaru Hyper Suprime-Cam. I. Halo substructures

DOI DOI PDF 参考文献46件 オープンアクセス
  • Yoshihisa Suzuki
    Astronomical Institute, Tohoku University , Aoba-ku, Sendai, Miyagi 980-8578 ,
  • Masashi Chiba
    Astronomical Institute, Tohoku University , Aoba-ku, Sendai, Miyagi 980-8578 ,
  • Yutaka Komiyama
    Department of Advanced Sciences, Faculty of Science and Engineering, Hosei University , 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584 ,
  • Kohei Hayashi
    Astronomical Institute, Tohoku University , Aoba-ku, Sendai, Miyagi 980-8578 ,
  • Masayuki Tanaka
    National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588 ,
  • Tetsuya Fukushima
    National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588 ,
  • Scott G Carlsten
    Department of Astrophysical Sciences, Princeton University , Peyton Hall, Princeton NJ 08544 ,
  • Akira Tokiwa
    Kavli Institute for the Physics and Mathematics of the Universe , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 ,
  • Tian Qiu
    Kavli Institute for the Physics and Mathematics of the Universe , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 ,
  • Masahiro Takada
    Kavli Institute for the Physics and Mathematics of the Universe , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 ,

この論文をさがす

説明

<jats:title>Abstract</jats:title> <jats:p>We analyze the photometric data in the Wide layer of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) over ∼1200 deg2 to uncover new halo substructures beyond the distance, D⊙ ∼ 30 kpc, from the Sun. For this purpose, we develop an isochrone filter for an old, metal-poor stellar system to extract the faint main-sequence stars at a range of distances. With this method, we detect not only the previously discovered substructures such as the Orphan Stream, but also a new overdensity toward Boötes at about D⊙ ∼ 60 kpc and a new stream-like feature toward Pisces at around D⊙ ∼ 60 kpc. It has been suggested that a small-scale overdensity exists in this direction of Pisces (the so-called Pisces Overdensity), but our results show that the overdensity is widely spread with a tidally elongated feature. Combining our results with the ongoing Hyper Suprime-Cam narrow-band survey and the near-future spectroscopic survey with Prime Focus Spectrograph (PFS) will allow us to place strong constraints on the origin of these halo substructures.</jats:p>

収録刊行物

参考文献 (46)*注記

もっと見る

関連プロジェクト

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ