The Gas-Star Formation Cycle in Nearby Star-forming Galaxies. II. Resolved Distributions of CO and Hα Emission for 49 PHANGS Galaxies

Article


Pan, Hsi-An, Schinnerer, Eva, Hughes, Annie, Leroy, Adam, Groves, Brent, Barnes, Ashley Thomas, Belfiore, Francesco, Bigiel, Frank, Blanc, Guillermo A., Cao, Yixian, Chevance, Mélanie, Congiu, Enrico, Dale, Daniel A., Eibensteiner, Cosima, Emsellem, Eric, Faesi, Christopher M., Glover, Simon C. O., Grasha, Kathryn, Herrera, Cinthya N., ..., Williams, Thomas G.. 2022. "The Gas-Star Formation Cycle in Nearby Star-forming Galaxies. II. Resolved Distributions of CO and Hα Emission for 49 PHANGS Galaxies." The Astrophysical Journal: an international review of astronomy and astronomical physics. 927. https://doi.org/10.3847/1538-4357/ac474f
Article Title

The Gas-Star Formation Cycle in Nearby Star-forming Galaxies. II. Resolved Distributions of CO and Hα Emission for 49 PHANGS Galaxies

ERA Journal ID1057
Article CategoryArticle
AuthorsPan, Hsi-An, Schinnerer, Eva, Hughes, Annie, Leroy, Adam, Groves, Brent, Barnes, Ashley Thomas, Belfiore, Francesco, Bigiel, Frank, Blanc, Guillermo A., Cao, Yixian, Chevance, Mélanie, Congiu, Enrico, Dale, Daniel A., Eibensteiner, Cosima, Emsellem, Eric, Faesi, Christopher M., Glover, Simon C. O., Grasha, Kathryn, Herrera, Cinthya N., Ho, I.-Ting, Klessen, Ralf S, Kruijssen, J. M. Diederik, Lang, Philipp, Liu, Daizhong, McElroy, Rebecca, Meidt, Sharon E., Murphy, Eric J., Pety, Jérôme, Querejeta, Miguel, Razza, Alessandro, Rosolowsky, Erik, Saito, Toshiki, Santoro, Francesco, Schruba, Andreas, Sun, Jiayi, Tomičić, Neven, Usero, Antonio, Utomo, Dyas and Williams, Thomas G.
Journal TitleThe Astrophysical Journal: an international review of astronomy and astronomical physics
Journal Citation927
Article Number9
Number of Pages49
Year2022
PublisherIOP Publishing
Place of PublicationUnited States
ISSN0004-637X
1538-4357
Digital Object Identifier (DOI)https://doi.org/10.3847/1538-4357/ac474f
Web Address (URL)https://iopscience.iop.org/article/10.3847/1538-4357/ac474f
AbstractThe relative distribution of molecular gas and star formation in galaxies gives insight into the physical processes and timescales of the cycle between gas and stars. In this work, we track the relative spatial configuration of CO and Hα emission at high resolution in each of our galaxy targets and use these measurements to quantify the distributions of regions in different evolutionary stages of star formation: from molecular gas without star formation traced by Hα to star-forming gas, and to H ii regions. The large sample, drawn from the Physics at High Angular resolution in Nearby GalaxieS ALMA and narrowband Hα (PHANGS-ALMA and PHANGS-Hα) surveys, spans a wide range of stellar masses and morphological types, allowing us to investigate the dependencies of the gas‒star formation cycle on global galaxy properties. At a resolution of 150 pc, the incidence of regions in different stages shows a dependence on stellar mass and Hubble type of galaxies over the radial range probed. Massive and/or earlier-type galaxies in our sample exhibit a significant reservoir of molecular gas without star formation traced by Hα, while lower-mass galaxies harbor substantial H ii regions that may have dispersed their birth clouds or formed from low-mass, more isolated clouds. Galactic structures add a further layer of complexity to the relative distribution of CO and Hα emission. Trends between galaxy properties and distributions of gas traced by CO and Hα are visible only when the observed spatial scale is ≪500 pc, reflecting the critical resolution requirement to distinguish stages of the star formation process.
Keywords573; 847; Astrophysics - Astrophysics of Galaxies
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020510102. Astronomical instrumentation
Byline AffiliationsMax Planck Institute for Astronomy, Germany
National center for scientific research (CNRS), France
Ohio State University, United States
University of Western Australia
University of Bonn, Germany
INAF Observatory of Astrophysics and Space Science, Italy
Carnegie Institution for Science, United States
University of Chile, Chile
Aix-Marseille University, France
Heidelberg University, Germany
University of Wyoming, United States
European Southern Observatory (ESO), Chile
University of Lyon, France
University of Massachusetts, United States
Australian National University
Institut de Radioastronomie Millimetrique (IRAM), France
University of Sydney
University of Gent, Belgium
National Radio Astronomy Observatory, United States
Paris Sciences and Letters University, France
National Astronomical Observatory (IGN), Spain
University of Alberta, Canada
Max Planck Institute for Extraterrestrial Physics, Germany
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