PHANGS-MUSE: The H II region luminosity function of local star-forming galaxies
Article
Article Title | PHANGS-MUSE: The H II region luminosity function of local star-forming galaxies |
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ERA Journal ID | 1050 |
Article Category | Article |
Authors | Santoro, Francesco, Kreckel, Kathryn, Belfiore, Francesco, Groves, Brent, Congiu, Enrico, Thilker, David A., Blanc, Guillermo A., Schinnerer, Eva, Ho, I.-Ting, Kruijssen, J. M. Diederik, Meidt, Sharon, Klessen, Ralf S., Schruba, Andreas, Querejeta, Miguel, Pessa, Ismael, Chevance, Mélanie, Kim, Jaeyeon, Emsellem, Eric, McElroy, Rebecca, Barnes, Ashley T., Bigiel, Frank, Boquien, Médéric, Dale, Daniel A., Glover, Simon C. O., Grasha, Kathryn, Lee, Janice, Leroy, Adam K., Pan, Hsi-An, Rosolowsky, Rosolowsky, Saito, Toshiki, Sanchez-Blazquez, Patricia, Watkins, Elizabeth J. and Williams, Thomas G. |
Journal Title | Astronomy and Astrophysics: a European journal |
Journal Citation | 658 |
Article Number | A188 |
Number of Pages | 41 |
Year | 2022 |
Publisher | EDP Sciences |
Place of Publication | France |
ISSN | 0004-6361 |
1432-0746 | |
Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202141907 |
Web Address (URL) | https://www.aanda.org/articles/aa/full_html/2022/02/aa41907-21/aa41907-21.html |
Abstract | We use an unprecedented sample of about 23 000 Hii regions detected at an average physical resolution of 67 pc in the PHANGS–MUSE sample to study the extragalactic Hii region H luminosity function (LF). Our observations probe the star-forming disk of 19 nearby spiral galaxies with low inclination and located close to the star formation main sequence at z = 0. The mean LF slope, , in our sample is = 1:73 with a of 0:15.We find that decreases with the galaxy’s star formation rate surface density, SFR, and argue that this is driven by an enhanced clustering of young stars at high gas surface densities. Looking at the Hii regions within single galaxies, we find that no significant variations occur between the LF of the inner and outer part of the star-forming disk, whereas the LF in the spiral arm areas is shallower than in the inter-arm areas for six out of the 13 galaxies with clearly visible spiral arms. We attribute these variations to the spiral arms increasing the molecular clouds’ arm–inter-arm mass contrast and find suggestive evidence that they are more evident for galaxies with stronger spiral arms. Furthermore, we find systematic variations in between samples of Hii regions with a high and low ionization parameter, q, and argue that they are driven by the aging of Hii regions. |
Keywords | HII regions; ISM: structure; galaxies: ISM; galaxies: star formation; galaxies: evolution; galaxies: spiral |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510102. Astronomical instrumentation |
Byline Affiliations | Max Planck Institute for Astronomy, Germany |
Heidelberg University, Germany | |
INAF - Arcetri Astrophysical Observatory, Italy | |
Australian National University | |
University of Chile, Chile | |
Johns Hopkins University, United States | |
Carnegie Institution for Science, United States | |
University of Gent, Belgium | |
Max Planck Institute for Extraterrestrial Physics, Germany | |
National Astronomical Observatory (IGN), Spain | |
European Southern Observatory (ESO), Germany | |
University of Lyon, France | |
University of Sydney | |
University of Bonn, Germany | |
University of Antofagasta, Chile | |
Aarhus University, Denmark | |
Gemini Observatory, United States | |
NSF's National Optical Infrared Astronomy Research Laboratory (NOIRLab), United States | |
Ohio State University, United States | |
Tamkang University, Taiwan | |
University of Alberta, Canada | |
Nihon University, Japan | |
National Astronomical Observatory of Japan, Japan | |
Complutense University of Madrid, Spain |
https://research.usq.edu.au/item/z75v2/phangs-muse-the-h-ii-region-luminosity-function-of-local-star-forming-galaxies
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