The Gas-Star Formation Cycle in Nearby Star-forming Galaxies. II. Resolved Distributions of CO and Hα Emission for 49 PHANGS Galaxies - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Year : 2022

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

Hsi-An Pan
Eva Schinnerer
Adam Leroy
Brent Groves
Ashley Thomas Barnes
  • Function : Author
Francesco Belfiore
Frank Bigiel
Guillermo A. Blanc
  • Function : Author
Yixian Cao
Mélanie Chevance
Enrico Congiu
Daniel A. Dale
  • Function : Author
Cosima Eibensteiner
Christopher M. Faesi
  • Function : Author
Simon C. O. Glover
  • Function : Author
Kathryn Grasha
Cinthya N. Herrera
  • Function : Author
I. -Ting Ho
  • Function : Author
Ralf S. Klessen
  • Function : Author
J. M. Diederik Kruijssen
  • Function : Author
Philipp Lang
  • Function : Author
Daizhong Liu
Rebecca Mcelroy
Sharon E. Meidt
  • Function : Author
Eric J. Murphy
  • Function : Author
Jérôme Pety
Miguel Querejeta
Alessandro Razza
Erik Rosolowsky
Toshiki Saito
Francesco Santoro
Andreas Schruba
  • Function : Author
Jiayi Sun
Neven Tomičić
  • Function : Author
Antonio Usero
Dyas Utomo
Thomas G. Williams
  • Function : Author

Abstract

The 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.
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insu-03667459 , version 1 (14-05-2022)

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Hsi-An Pan, Eva Schinnerer, Annie Hughes, Adam Leroy, Brent Groves, et al.. 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, 2022, 927, ⟨10.3847/1538-4357/ac474f⟩. ⟨insu-03667459⟩
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