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https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/125145
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| Title: | The impact of H II regions on giant molecular cloud properties in nearby galaxies sampled by PHANGS ALMA and MUSE |
| Authors: | Zakardjian, Antoine;Pety, Jérôme;Herrera, Cinthya N.;Hughes, Annie;Oakes, Elias;Kreckel, Kathryn;Faesi, Chris;Glover, Simon C. O.;Groves, Brent;Klessen, Ralf S.;Meidt, Sharon;Barnes, Ashley;Belfiore, Francesco;Bešlić, Ivana;Bigiel, Frank;Blanc, Guillermo A.;Chevance, Mélanie;Dale, Daniel A.;Brok, Jakob den;Eibensteiner, Cosima;Emsellem, Eric;Axel, García-Rodríguez;Grasha, Kathryn;Koch, Eric W.;Leroy, Adam K.;Liu, Daizhong;Elroy, Rebecca Mc;Neumann, Lukas;Pan, Hsi-An;Querejeta, Miguel;Razza, Alessandro;Rosolowsky, Erik;Saito, Toshiki;Santoro, Francesco;Schinnerer, Eva;Sun, Jiayi;Usero, Antonio;Watkins, Elizabeth J.;Williams, Thomas |
| Keywords: | HII regions;ISM: clouds;evolution;galaxies: ISM |
| Date: | 2023-10-20 |
| Issue Date: | 2024-03-06 12:05:21 (UTC+8) |
| Publisher: | EDP Sciences |
| 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. |
| Relation: | Astronomy & Astrophysics 678 |
| DOI: | 10.1051/0004-6361/202244520 |
| Appears in Collections: | [物理學系暨研究所] 期刊論文
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