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VERTICO IV: Environmental Effects on the Gas Distribution and Star Formation Efficiency of Virgo Cluster Spirals
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2023.01.25
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천문우주학과
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VERTICO IV: Environmental Effects on the Gas Distribution and Star Formation Efficiency of Virgo Cluster Spirals

Vicente Villanueva, Alberto D. Bolatto, Stuart Vogel, Tobias Brown, Christine D. Wilson, Nikki Zabel, Sara Ellison, Adam R. H. Stevens, Maria Jesus Jimenez Donaire, Kristine Spekkens, Mallory Thorp, Timothy A. Davis, Laura C. Parker, Ian D. Roberts, Dhruv Bisaria, Alessandro Boselli, Barbara Catinella, Aeree Chung, Luca Cortese, Bumhyun Lee, Adam Watts


We measure the molecular-to-atomic gas ratio, Rmol, and the star formation rate (SFR) per unit molecular gas mass, SFEmol, in 38 nearby galaxies selected from the Virgo Environment Traced in CO (VERTICO) survey. We determine their scale-lengths for the molecular and stellar components and find a roughly 3:5 ratio between them compared to 1:1 in field galaxies, indicating that the CO emission is more centrally concentrated than the stars. We compute Rmol as a function of different physical quantities. While the spatially-resolved Rmol on average decreases with increasing radius, we find that the mean molecular-to-atomic gas ratio within the stellar effective radius Re, Rmol(r<Re), shows a systematic increase with the level of HI, truncation and/or asymmetry (HI perturbation). Analysis of the molecular- and the atomic-to-stellar mass ratios within Re, Rmol(r<Re) and Ratom(r<Re), shows that VERTICO galaxies have increasingly lower Ratom(r<Re) for larger levels of HIperturbation (compared to field galaxies matched in stellar mass), but no significant change in Rmol(r<Re). We also measure a clear systematic decrease of the SFEmol within Re, SFEmol(r<Re), with increasingly perturbed HI. Therefore, compared to galaxies from the field, VERTICO galaxies are more compact in CO emission in relation to their stellar distribution, but increasingly perturbed atomic gas increases their Rmol and decreases the efficiency with which their molecular gas forms stars. (abridged)


https://ui.adsabs.harvard.edu/abs/2022ApJ...940..176V/abstract

저자명
Aeree Chung