@article{8747478,
  abstract     = {{We use an unprecedented sample of about 23 000 H II regions detected at an average physical resolution of 67 pc in the PHANGS-MUSE sample to study the extragalactic H II region H alpha 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, alpha, in our sample is = 1.73 with a sigma of 0.15. We find that alpha decreases with the galaxy's star formation rate surface density, Sigma(SFR), and argue that this is driven by an enhanced clustering of young stars at high gas surface densities. Looking at the H II 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 a between samples of H II regions with a high and low ionization parameter, q, and argue that they are driven by the aging of H II regions.}},
  articleno    = {{A188}},
  author       = {{Santoro, Francesco and Kreckel, Kathryn and Belfiore, Francesco and Groves, Brent and Congiu, Enrico and Thilker, David A. and Blanc, Guillermo A. and Schinnerer, Eva and Ho, I. -Ting and Diederik Kruijssen, J.~M. and van der Wel, Sharon Meidt and Klessen, Ralf S. and Schruba, Andreas and Querejeta, Miguel and Pessa, Ismael and Chevance, Mélanie and Kim, Jaeyeon and Emsellem, Eric and McElroy, Rebecca and Barnes, Ashley T. and Bigiel, Frank and Boquien, Médéric and Dale, Daniel A. and Glover, Simon C.~O. and Grasha, Kathryn and Lee, Janice and Leroy, Adam K. and Pan, Hsi-An and Rosolowsky, Erik and Saito, Toshiki and Sanchez-Blazquez, Patricia and Watkins, Elizabeth J. and Williams, Thomas G.}},
  issn         = {{0004-6361}},
  journal      = {{ASTRONOMY & ASTROPHYSICS}},
  keywords     = {{HII regions,ISM: structure,galaxies: ISM,galaxies: star formation,galaxies: evolution,galaxies: spiral,Astrophysics - Astrophysics of Galaxies,INTEGRAL FIELD SPECTROSCOPY,WARM IONIZED MEDIUM,HII-REGIONS,SPIRAL GALAXIES,MOLECULAR GAS,UNCERTAINTY PRINCIPLE,POPULATION SYNTHESIS,ABUNDANCE GRADIENTS,CLUSTER FORMATION,STELLAR CLUSTERS}},
  language     = {{eng}},
  pages        = {{41}},
  title        = {{PHANGS-MUSE : the H II region luminosity function of local star-forming galaxies}},
  url          = {{http://doi.org/10.1051/0004-6361/202141907}},
  volume       = {{658}},
  year         = {{2022}},
}

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