RT Journal Article
T1 The PHANGS–MUSE nebular catalogue
A1 Groves, B
A1 Kreckel, K
A1 Santoro, F
A1 Belfiore, F
A1 Zavodnik, E
A1 Congiu, E
A1 Egorov, O V
A1 Emsellem, E
A1 Sánchez Blázquez, Patricia
A1 Williams, T G
AB Ionized nebulae provide critical insights into the conditions of the interstellar medium (ISM). Their bright emission lines enable the measurement of physical properties, such as the gas-phase metallicity, across galaxy discs and in distant galaxies. The PHANGS–MUSE survey has produced optical spectroscopic coverage of the central star-forming discs of 19 nearby main-sequence galaxies. Here, we use the H α morphology from this data to identify 30 790 distinct nebulae, finding thousands of nebulae per galaxy. For each nebula, we extract emission line fluxes and, using diagnostic line ratios, identify the dominant excitation mechanism. A total of 23 244 nebulae (75 per cent) are classified as H II regions. The dust attenuation of every nebulae is characterized via the Balmer decrement and we use existing environmental masks to identify their large-scale galactic environment (centre, bar, arm, interarm, and disc). Using strong-line prescriptions, we measure the gas-phase oxygen abundances (metallicity) and ionization parameter for all H II regions. With this new catalogue, we measure the radial metallicity gradients and explore second-order metallicity variations within each galaxy. By quantifying the global scatter in metallicity per galaxy, we find a weak negative correlation with global star formation rate and stronger negative correlation with global gas velocity dispersion (in both ionized and molecular gas). With this paper we release the full catalogue of strong line fluxes and derived properties, providing a rich data base for a broad variety of ISM studies.
PB Oxford University Press
SN 0035-8711
YR 2023
FD 2023
LK https://hdl.handle.net/20.500.14352/134891
UL https://hdl.handle.net/20.500.14352/134891
LA eng
NO Groves, B., et al. «The PHANGS–MUSE Nebular Catalogue». Monthly Notices of the Royal Astronomical Society, vol. 520, n.o 4, febrero de 2023, pp. 4902-52. DOI.org (Crossref), https://doi.org/10.1093/mnras/stad114.
NO © 2023 The Author(s).
NO German Research Foundation
NO Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)
NO European Research Council
NO Heidelberg Cluster of Excellence
NO ANID Basal
NO Ministerio de Ciencia e Innovación  (España)
NO Agencia Estatal de Investigación (España)
NO European Commission
DS Docta Complutense
RD 8 jun 2026