Star Formation Properties of Sloan Digital Sky Survey BOSS Void Galaxies in the Hyper Suprime-Cam Survey

We utilize the Hyper Suprime-Cam (HSC) Wide Survey to explore the properties of galaxies located in the voids identified from the Baryon Oscillation Spectroscopic Survey up to z ∼ 0.7. The HSC reaches i ∼ 25, allowing us to characterize the void galaxies down to 10 9.2 solar mass. We find that the r...

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Bibliographic Details
Published in:The Astrophysical journal 2022-02, Vol.926 (2), p.115
Main Authors: Jian, Hung-Yu, Lin, Lihwai, Hsieh, Bau-Ching, Lin, Kai-Yang, Umetsu, Keiichi, Lopez-Coba, Carlos, Koyama, Yusei, Hsu, Chin-Hao, Su, Yung-Chau, Chang, Yu-Yen, Kodama, Tadayuki, Komiyama, Yutaka, More, Surhud, Nishizawa, Atsushi J., Oguri, Masamune, Tanaka, Ichi
Format: Article
Language:English
Subjects:
Astrophysics
Extragalactic astronomy
Fractions
Galactic evolution
Galaxies
Galaxy distribution
Galaxy environments
Galaxy evolution
Large-scale structure of the universe
Red shift
Sky surveys (astronomy)
Space telescopes
Star & galaxy formation
Star formation
Star formation rate
Stars & galaxies
Valleys
Voids
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Summary:We utilize the Hyper Suprime-Cam (HSC) Wide Survey to explore the properties of galaxies located in the voids identified from the Baryon Oscillation Spectroscopic Survey up to z ∼ 0.7. The HSC reaches i ∼ 25, allowing us to characterize the void galaxies down to 10 9.2 solar mass. We find that the revised void galaxy densities, when including faint galaxies in voids defined by bright galaxies, are still underdense compared to the mean density from the entire field. In addition, we classify galaxies into star-forming, quiescent, and green valley populations, and find that void galaxies tend to have slightly higher fractions of star-forming galaxies under the mass and redshift control, although the significance of this result is only moderate (2 σ ). However, when we focus on the star-forming population, the distribution of the specific star formation rate (sSFR) of void galaxies shows little difference from that of the control galaxies. Similarly, the median sSFR of star-forming void galaxies is also in good agreement with that of the star-forming control galaxies. Moreover, the effective green valley fraction of void galaxies, defined as the number of green valley galaxies over the number of nonquiescent galaxies, is comparable to that of the control ones, supporting the suggestion that void and control galaxies evolve under similar physical processes and quenching frequencies. Our results thus favor a scenario of galaxy assembly bias.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac448b