CO($J$=1-0) mapping survey of 64 galaxies in the Fornax cluster with the ALMA Morita array
Kana Morokuma-Matsui, Kenji Bekki, Jing Wang, Paolo Serra, Yusei, Koyama, Tomoki Morokuma, Fumi Egusa, Bi-Qing For, Kouichiro Nakanishi,, B\"abel S. Koribalski, Takashi Okamoto, Tadayuki Kodama, Bumhyun Lee, Filippo, M. Maccagni, Rie E. Miura, Daniel Espada, Tsutomu T. Takeuchi

TL;DR
This study maps CO emission in 64 Fornax cluster galaxies using ALMA, revealing that reduced cold-gas fractions, especially atomic gas, primarily cause low star formation activity, influenced by environmental stripping processes.
Contribution
First comprehensive CO mapping survey of Fornax cluster galaxies with ALMA, linking cold-gas properties to environmental effects and star formation suppression.
Findings
Low star formation is due to decreased cold-gas fraction, not efficiency.
Atomic gas is more heavily stripped than molecular gas in low-SF galaxies.
Environmental processes like tidal and ram pressure stripping reduce cold-gas reservoirs.
Abstract
We conduct a CO(=1-0) (hereafter CO) mapping survey of 64 galaxies in the Fornax cluster using the ALMA Morita array in cycle 5. CO emission is detected from 23 out of the 64 galaxies. Our sample includes dwarf, spiral and elliptical galaxies with stellar masses of ~M. The achieved beam size and sensitivity are and ~mJy~beam at the velocity resolution of ~km~s, respectively. We study the cold-gas (molecular- and atomic-gas) properties of 38 subsamples with ~M combined with literature HI data. We find that: (1) the low star-formation (SF) activity in the Fornax galaxies is caused by the decrease in the cold-gas mass fraction with respect to stellar mass (hereafter, gas fraction) rather than the decrease of the SF efficiency from the cold gas; (2) the atomic-gas…
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Taxonomy
TopicsSpectroscopy and Laser Applications · Galaxies: Formation, Evolution, Phenomena · Astrophysics and Star Formation Studies
