Molecular gas in the poststarburst galactic nucleus of NGC 4736

Yasuhiro Shioya, Tomoka Tosaki, Youichi Ohyama, Takashi Murayama, Toru Yamada, Sumio Ishizuki, Yoshiaki Taniguchi

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10 Citations (Scopus)

Abstract

We present 12CO(J = 1-0) observations of the poststarburst nucleus of NGC 4736. Although star in the nuclear region is currently inactive, there is a substantial amount of molecular gas, ∼ 107 M(Fisheye sign), in the central ∼ 300 pc region. Comparing the observed molecular-gas surface density with the threshold gas density for star formation proposed by Kennicutt (1989, AAA 50.157.264), we find that the nuclear gas disk is stable for gravitational instability. We discuss possible scenarios for the nuclear starburst evolution of NGC 4736 in terms of either bar-driven instability fueling or minor-merger driven fueling (or triggering).

Original languageEnglish
Pages (from-to)317-323
Number of pages7
JournalPublications of the Astronomical Society of Japan
Volume50
Issue number3
DOIs
Publication statusPublished - 1998

Keywords

  • Galaxies: Active
  • Galaxies: Evolution
  • Galaxies: Individual (NGC 4736)
  • Stars: Formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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