MUSE M33 HII regions catalog

These data provide an unprecedented view of the galaxy interstellar medium (ISM), and allow us to resolve ionised nebulae at a spatial scale of ~=5pc. We identify and catalogue 124 HII regions, down to H{alpha} luminosities of ~=5*10^35^erg/s, one order of magnitude fainter than previous surveys on local galaxies, and compare these regions with the spatial distribution of ionising stars and embedded star clusters.

For each region, we extract the corresponding integrated optical spectra and measured the intensity of key optical emission lines (H{beta}{lambda}4861, [OIII]4959,5007, [NII]{lambda}6548,6584, H{alpha}, [SII]{lambda}6716,6731, [SIII]{lambda}9069, other weaker optical lines when detectable, and Paschen lines) to characterize their physical properties of the ioinized gas such as density, dust attenuation, and metallicity.