Wang, Junzhi, Yang, Kai, Zhang, Zhi-Yu, Fang, Min, Shi, Yong, Liu, Shu, Li, Juan and Li, Fei (2020). CO observations towards HI-rich Ultradiffuse Galaxies. Mon. Not. Roy. Astron. Soc., 499 (1). S. L26 - 5. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We present CO observations towards a sample of six HI-rich Ultradiffuse galaxies (UDGs) as well as one UDG (VLSB-A) in the Virgo Cluster with the Institut de RadioAstronomie Millimetrique (IRAM) 30-m telescope. CO J = 1-0 is marginally detected at 4 sigma level in AGC 122966, as the first detection of CO emission in UDGs. We estimate upper limits of molecular mass in other galaxies from the non-detection of CO lines. These upper limits and the marginal CO detection in AGC 122966 indicate low mass ratios between molecular and atomic gas masses. With the star formation efficiency derived from the molecular gas, we suggest that the inefficiency of star formation in such HI-rich UDGs is likely caused by the low efficiency in converting molecules from atomic gas, instead of low efficiency in forming stars from molecular gas.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Wang, JunzhiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yang, KaiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zhang, Zhi-YuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fang, MinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shi, YongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liu, ShuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Li, JuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Li, FeiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-313582
DOI: 10.1093/mnrasl/slaa150
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 499
Number: 1
Page Range: S. L26 - 5
Date: 2020
Publisher: OXFORD UNIV PRESS
Place of Publication: OXFORD
ISSN: 1365-2966
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
BRIGHTNESS; DETECTIONSMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/31358

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