PGC 38025: A Star-forming Lenticular Galaxy with an Off-nuclear Star-forming Core

Lenticular galaxies (S0s) were considered mainly as passive evolved spirals due to environmental effects for a long time; however, most S0s in the field cannot fit into this common scenario. In this work, we study one special case, Sloan Digital Sky Survey J120237.07+642235.3 (PGC 38025), a star-for...

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Bibliographic Details
Published in:The Astrophysical journal 2021-07, Vol.915 (1), p.1
Main Authors: Chen, Zhengyi, Gu, Qiu-Sheng, García-Benito, Rubén, Zhang, Zhi-Yu, Ge, Xue, Xiao, Mengyuan, Yu, Xiaoling
Format: Article
Language:English
Subjects:
Astrophysics
Deposition
Disk galaxies
Early-type galaxies
Environmental effects
Galactic evolution
Galaxies
Galaxy kinematics
Kinematics
Lenticular galaxies
Metallicity
Molecular gases
Red shift
Sky surveys (astronomy)
Spatial distribution
Spirals
Star & galaxy formation
Star formation
Star formation rate
Stars
Stars & galaxies
Stellar evolution
Stellar mass
Stellar rotation
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Summary:Lenticular galaxies (S0s) were considered mainly as passive evolved spirals due to environmental effects for a long time; however, most S0s in the field cannot fit into this common scenario. In this work, we study one special case, Sloan Digital Sky Survey J120237.07+642235.3 (PGC 38025), a star-forming field S0 galaxy with an off-nuclear blue core. We present optical integral field spectroscopic observation with the 3.5 meter telescope at Calar Alto Observatory, and high-resolution millimeter observation with the NOrthern Extended Millimeter Array. We estimated the star formation rate (SFR = 0.446 M ⊙ yr −1 ) and gaseous metallicity (12 + log(O/H) = 8.42) for PGC 38025, which follows the star formation main sequence and stellar mass–metallicity relation. We found that the ionized gas and cold molecular gas in PGC 38025 show the same spatial distribution and kinematics, while rotating misaligned with stellar component. The off-nuclear blue core is locating at the same redshift as PGC 38025 and its optical spectrum suggest it is H ii region. We suggest that the star formation in PGC 38025 is triggered by a gas-rich minor merger, and the off-nuclear blue core might be a local star formation happened during the accretion/merger process.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/abfb62