The impact of H II regions on giant molecular cloud properties in nearby galaxies sampled by PHANGS ALMA and MUSE - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2023

The impact of H II regions on giant molecular cloud properties in nearby galaxies sampled by PHANGS ALMA and MUSE

Cinthya N. Herrera
  • Function : Author
Elias Oakes
  • Function : Author
Kathryn Kreckel
  • Function : Author
Chris Faesi
  • Function : Author
Simon C. O. Glover
  • Function : Author
Brent Groves
  • Function : Author
Ralf S. Klessen
  • Function : Author
Sharon Meidt
  • Function : Author
Ashley Barnes
  • Function : Author
Francesco Belfiore
  • Function : Author
Ivana Bešlić
  • Function : Author
Frank Bigiel
  • Function : Author
Guillermo A. Blanc
  • Function : Author
Mélanie Chevance
  • Function : Author
Daniel A. Dale
  • Function : Author
Jakob den Brok
  • Function : Author
Cosima Eibensteiner
  • Function : Author
Axel García-Rodríguez
  • Function : Author
Kathryn Grasha
  • Function : Author
Eric W. Koch
  • Function : Author
Adam K. Leroy
  • Function : Author
Daizhong Liu
  • Function : Author
Rebecca Mc Elroy
  • Function : Author
Lukas Neumann
  • Function : Author
Hsi-An Pan
  • Function : Author
Miguel Querejeta
  • Function : Author
Alessandro Razza
  • Function : Author
Erik Rosolowsky
  • Function : Author
Toshiki Saito
  • Function : Author
Francesco Santoro
  • Function : Author
Eva Schinnerer
  • Function : Author
Jiayi Sun
  • Function : Author
Antonio Usero
  • Function : Author
Elizabeth J. Watkins
  • Function : Author
Thomas Williams
  • Function : Author

Abstract

Context. The final stages of molecular cloud evolution involve cloud disruption due to feedback by massive stars, with recent literature suggesting the importance of early (i.e., pre-supernova) feedback mechanisms.
Aims: We aim to determine whether feedback from massive stars in H II regions has a measurable impact on the physical properties of molecular clouds at a characteristic scale of ~ 100 pc, and whether the imprint of feedback on the molecular gas depends on the local galactic environment.
Methods: We identified giant molecular clouds (GMCs) associated with H II regions for a sample of 19 nearby galaxies from catalogs of GMCs and H II regions released by the PHANGS-ALMA and PHANGS-MUSE surveys, using the overlap of the CO and Hα emission as the key criterion for physical association. We compared the distributions of GMC and H II region properties for paired and non-paired objects. We investigated correlations between GMC and H II region properties among galaxies and across different galactic environments to determine whether GMCs that are associated with H II regions have significantly distinct physical properties compared to the parent GMC population.
Results: We identify trends between the Hα luminosity of an H II region and the CO peak brightness and molecular mass of GMCs that we tentatively attribute to a direct physical connection between the matched objects, and which arise independently of the underlying environmental variations of GMC and H II region properties within galaxies. The study of the full sample nevertheless hides a large galaxy-to-galaxy variability.
Conclusions: At the ~100 pc scales accessed by the PHANGS-ALMA and PHANGS-MUSE data, pre-supernova feedback mechanisms in H II regions have a subtle but measurable impact on the properties of the surrounding molecular gas, as inferred from CO observations.
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Dates and versions

insu-04473148 , version 1 (23-02-2024)

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Antoine Zakardjian, Jérôme Pety, Cinthya N. Herrera, Annie Hughes, Elias Oakes, et al.. The impact of H II regions on giant molecular cloud properties in nearby galaxies sampled by PHANGS ALMA and MUSE. Astronomy and Astrophysics - A&A, 2023, 678, ⟨10.1051/0004-6361/202244520⟩. ⟨insu-04473148⟩
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