New Look at the Molecular Superbubble Candidate in the Galactic Center

Shiho Tsujimoto, Tomoharu Oka, Shunya Takekawa, Yuhei Iwata, Asaka Uruno, Hiroki Yokozuka, Ryosuke Nakagawara, Yuto Watanabe, Akira Kawakami, Sonomi Nishiyama, Miyuki Kaneko, Shoko Kanno, Takuma Ogawa

Research output: Contribution to journalArticlepeer-review

Abstract

The l = +1.3 region in the Galactic center is characterized by multiple shell-like structures and their extremely broad velocity widths. We revisit the molecular superbubble hypothesis for this region, based on high-resolution maps of CO J = 1-0, 13CO J = 1-0, H13CN J = 1-0, H13CO+ J = 1-0, SiO J = 2-1, and CS J = 2-1 lines obtained from the Nobeyama Radio Observatory 45 m telescope, as well as CO J = 3-2 maps obtained from the James Clerk Maxwell telescope. We identified 11 expanding shells with total kinetic energy and typical expansion time E kin ∼ 1051.9 erg and t exp ∼ 104.9 yr, respectively. In addition, the l = +1.3 region exhibited high SiO J = 2-1/H13CN J = 1-0 and SiO J = 2-1/H13CO+ J = 1-0 intensity ratios, indicating that the region has experienced dissociative shocks in the past. These new findings confirm the molecular superbubble hypothesis for the l = +1.3 region. The nature of the embedded star cluster, which may have supplied 20-70 supernova explosions within 105 yr, is discussed. This work also shows the importance of compact broad-velocity-width features in searching for localized energy sources hidden behind severe interstellar extinction and stellar contamination.

Original languageEnglish
Article number61
JournalAstrophysical Journal
Volume910
Issue number1
DOIs
Publication statusPublished - 2021 Mar 20

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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