Molecular gas in the poststarburst galactic nucleus of NGC 4736

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

doi:10.1093/pasj/50.3.317

Molecular gas in the poststarburst galactic nucleus of NGC 4736

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

SCI - Astronomy

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	317-323
Number of pages	7
Journal	Publications of the Astronomical Society of Japan
Volume	50
Issue number	3
DOIs	https://doi.org/10.1093/pasj/50.3.317
Publication status	Published - 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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title = "Molecular gas in the poststarburst galactic nucleus of NGC 4736",

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).",

keywords = "Galaxies: Active, Galaxies: Evolution, Galaxies: Individual (NGC 4736), Stars: Formation",

author = "Yasuhiro Shioya and Tomoka Tosaki and Youichi Ohyama and Takashi Murayama and Toru Yamada and Sumio Ishizuki and Yoshiaki Taniguchi",

year = "1998",

doi = "10.1093/pasj/50.3.317",

language = "English",

volume = "50",

pages = "317--323",

journal = "Publications of the Astronomical Society of Japan",

issn = "0004-6264",

publisher = "Astronomical Society of Japan",

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TY - JOUR

T1 - Molecular gas in the poststarburst galactic nucleus of NGC 4736

AU - Shioya, Yasuhiro

AU - Tosaki, Tomoka

AU - Ohyama, Youichi

AU - Murayama, Takashi

AU - Yamada, Toru

AU - Ishizuki, Sumio

AU - Taniguchi, Yoshiaki

PY - 1998

Y1 - 1998

N2 - 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).

AB - 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).

KW - Galaxies: Active

KW - Galaxies: Evolution

KW - Galaxies: Individual (NGC 4736)

KW - Stars: Formation

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U2 - 10.1093/pasj/50.3.317

DO - 10.1093/pasj/50.3.317

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EP - 323

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

SN - 0004-6264

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ER -

Molecular gas in the poststarburst galactic nucleus of NGC 4736

Abstract

Keywords

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