M^3D: Mosaicking M33 with MUSE datacubes I. Unveiling the diversity of HII regions in M33 with MUSE

Abstract

We present new VLT/MUSE observations of a 3 $\times$ 8 arcmin${}^2$ mosaic along the southern major axis of the Local Group galaxy M33. These data provide an unprecedented view of the galaxy's interstellar medium (ISM) and allow us to resolve ionised nebulae at a spatial scale of $\approx$5 pc. We identified and catalogued 131 HII regions, down to Hαluminosities of $\approx 5\times$10${}^{35}$ erg s${}^{-1}$, one order of magnitude fainter than previous surveys on nearby galaxies beyond the Local Group, and we compared these regions with the spatial distribution of ionising stars and embedded star clusters. For each region, we extracted the corresponding integrated optical spectra and measured the intensity of key optical emission lines (Hβ, [OIII], [NII], Hα, [SII], [SIII]), other weaker optical lines when detectable, and Paschen lines to characterise the physical properties of the ioinised gas, such as density, dust attenuation, and metallicity. Our spatially resolved line ratio and flux maps reveal a remarkable diversity in ionisation properties, from dust-obscured regions hosting young stellar objects to highly ionised bubbles exhibiting high [OIII]/Hβratios. Our data reveal a diversity of ionisation fronts, ranging from well-defined to partial to absent. The radial profiles we obtained indicate the presence of both optically thin (density-bounded) HII regions permitting the escape of ionising photons and fully ionised, optically thick (ionisation-bounded) HII regions. The richness of this MUSE mosaic offers an unprecedented view of the ionised ISM at $\approx$5 pc resolution, providing direct insight into how stellar feedback shapes its environment.

arXiv comment20 pages, 16 figures, Accepted for publication in A&A

References in corpus (99)

• The chemical composition of the Sun
• The Host Galaxies of AGN
• Star Formation in the Milky Way and Nearby Galaxies
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Theoretical Modeling of Starburst Galaxies
• Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
• The Host Galaxies and Classification of Active Galactic Nuclei
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Adaptive spatial binning of integral-field spectroscopic data using Voronoi tessellations
• Using Strong Lines to Estimate Abundances in Extragalactic HII Regions and Starburst Galaxies
• WFPC2 Stellar Photometry with HSTphot
• De Re Metallica: The cosmic chemical evolution of galaxies
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• UV-extended E-MILES stellar population models: young components in massive early-type galaxies
• Understanding Galaxy Evolution through Emission Lines
• A Survey of Local Group Galaxies Currently Forming Stars. I. UBVRI Photometry of Stars in M31 and M33
• The warm ionized medium in spiral galaxies
• The Data Processing Pipeline for the MUSE Instrument
• Ionization State of Inter-Stellar Medium in Galaxies: Evolution, SFR-M_star-Z Dependence, and Ionizing Photon Escape
• Modelling the nebular emission from primeval to present-day star-forming galaxies
• New calibrations for abundance determinations in HII regions
• The PHANGS-MUSE survey -- Probing the chemo-dynamical evolution of disc galaxies
• Fast and inefficient star formation due to short-lived molecular clouds and rapid feedback
• The Origin and Optical Depth of Ionizing Radiation in the "Green Pea" Galaxies
• Strongly star forming galaxies in the local Universe with nebular He II 4686 emission
• New insights into the stellar content and physical conditions of star-forming galaxies at z = 2-3 from spectral modelling
• SDSS-IV MaNGA: The Impact of Diffuse Ionized Gas on Emission-line Ratios, Interpretation of Diagnostic Diagrams, and Gas Metallicity Measurements
• The Data Analysis Pipeline for the SDSS-IV MaNGA IFU Galaxy Survey: Emission-Line Modeling
• Modelling the Pan-Spectral Energy Distribution of Starburst Galaxies: III. Emission Line Diagnostics of Ensembles of Evolving HII Regions
• The Optical Depth of H II Regions in the Magellanic Clouds
• CHAOS I: Direct Chemical Abundances for HII Regions in NGC 628
• A Survey of Local Group Galaxies Currently Forming Stars: III. A Search for Luminous Blue Variables and Other H-alpha Emission-Lined Stars
• A Multiwavelength Optical Emission Line Survey of Warm Ionized Gas in the Galaxy
• The M33 Metallicity Project: Resolving the Abundance Gradient Discrepancies in M33
• The Role of Stellar Feedback in the Dynamics of HII Regions
• CHAOS IV: Gas-Phase Abundance Trends From The First Four CHAOS Galaxies
• Constraints on the production and escape of ionizing radiation from the emission-line spectra of metal-poor star-forming galaxies
• A tale of two DIGs: The relative role of HII regions and low-mass hot evolved stars in powering the diffuse ionised gas (DIG) in PHANGS-MUSE galaxies
• The Planetary Nebula System of M33
• The Chandra ACIS Survey of M33: X-ray, Optical and Radio Properties of the Supernova Remnants
• Structure and Feedback in 30 Doradus II. Structure and Chemical Abundances
• The Contribution of Field OB Stars to the Ionization of the Diffuse Ionized Gas in M33
• Excitation properties of galaxies with the highest [OIII]/[OII] ratios: No evidence for massive escape of ionizing photons
• From molecules to Young Stellar Clusters: the star formation cycle across the M33 disk
• Metal production in M33: space and time variations
• The PHANGS-MUSE Nebula Catalogue
• SDSS IV MaNGA -- Metallicity and ionisation parameter in local star-forming galaxies from Bayesian fitting to photoionisation models
• The Wolf-Rayet Content of M33
• Carbon and oxygen abundance gradients in NGC300 and M33 from optical recombination lines
• Dynamical signatures of a LCDM-halo and the distribution of the baryons in M33
• Feedback from massive stars at low metallicities: MUSE observations of N44 and N180 in the Large Magellanic Cloud
• The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER) I. Ultraviolet to Infrared Photometry of 22 Million Stars in M33
• SITELLE: An Imaging Fourier Transform Spectrometer for the Canada-France-Hawaii Telescope
• CHAOS VI: Direct Abundances in NGC 2403
• Which feedback mechanisms dominate in the high-pressure environment of the Central Molecular Zone?
• SIGNALS: I. Survey Description
• The M33 Variable Star Population Revealed by Spitzer
• Evolution of Stellar Feedback in HII Regions
• Variation in the dust emissivity index across M33 with Herschel and Spitzer (HerM33es)
• Kinematics of the Atomic ISM in M33 on 80 pc scales
• The Araucaria Project. A Distance Determination to the Local Group Spiral M33 from Near-Infrared Photometry of Cepheid Variables
• Comparing the pre-SNe feedback and environmental pressures for 6000 HII regions across 19 nearby spiral galaxies
• The impact of pre-supernova feedback and its dependence on environment
• SILCC VII -- Gas kinematics and multiphase outflows of the simulated ISM at high gas surface densities
• Stellar Feedback and Resolved Stellar IFU Spectroscopy in the nearby Spiral Galaxy NGC 300
• CHAOS VII: A Large-Scale Direct Abundance Study in M33
• WARPFIELD-EMP: The Self-Consistent Prediction of Emission Lines from Evolving HII Regions in Dense Molecular Clouds
• The Chandra ACIS Survey of M33 (ChASeM33): The final source catalog
• Stellar feedback in M83 as observed with MUSE -- II. Analysis of the HII region population: ionisation budget and pre-SN feedback
• The MUSE Atlas of Disks (MAD): Ionized gas kinematic maps and an application to Diffuse Ionized Gas
• MMT Spectroscopy of Supernova Remnant Candidates in M33
• The galactocentric radius dependent upper mass limit of young star clusters: stochastic star formation ruled out
• Properties of Optically Selected Supernova Remnant Candidates in M33
• The cluster birthline in M33
• The X-ray binary population in M33: I. Source list and luminosity function
• The diffuse ionized gas (DIG) in star-forming galaxies: the influence of aperture effects on local HII regions
• The population of Young Stellar Clusters throughout the disk of M33
• HOMERUN a new approach to photoionization modelling. I -- reproducing observed emission lines with percent accuracy and obtaining accurate physical properties of the ionized gas
• SDSS-V Local Volume Mapper (LVM): A Glimpse into Orion
• Spectral Energy Distributions of HII regions in M33 (HerM33es)
• Stellar feedback in M83 as observed with MUSE -- I. Overview, an unprecedented view of the stellar and gas kinematics and evidence of outflowing gas
• The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). IV. Star Cluster Catalog
• Detection of He++ ion in the star-forming ring of the Cartwheel using MUSE data and ionizing mechanisms
• Attenuation modified by DIG and dust as seen in M31
• Theoretically Modelling Photoionized Regions with Fractal Geometry in Three Dimensions
• Messenger Monte-Carlo MAPPINGS V (M^3) -- A self-consistent three-dimensional photoionization code
• A Deep XMM-Newton Survey of M33: Point Source Catalog, Source Detection and Characterization of Overlapping Fields
• Metallicity calibrations based on auroral lines from PHANGS-MUSE data
• Calibrating star-formation rate prescriptions at different scales (10 pc to 1 kpc) in M31
• Machine Learning Approach to Integral Field Unit Spectroscopy Observations: I. HII Region Kinematics
• Mapping the core of the Tarantula Nebula with VLT-MUSE II. The spectroscopic Hertzsprung-Russell diagram of OB stars in NGC 2070
• Young stellar clusters and associations in M33
• The Karl G. Jansky Very Large Array Local Group L-band Survey (LGLBS)
• A Machine Learning Approach to Integral Field Unit Spectroscopy Observations: II. HII Region LineRatios
• Multiwavelength Characterization of the High Mass X-ray Binary Population of M33
• MUSE crowded field 3D spectroscopy in NGC 300 III. Characterizing extremely faint HII regions and diffuse ionized gas
• ACA CO($J=2-1$) Mapping of the Nearest Spiral Galaxy M33. I. Initial Results and Identification of Molecular Clouds
• The MUSE view of the Sculptor galaxy: survey overview and the planetary nebulae luminosity function
• Classifying spectra of emission-line regions with neural networks -- An application to integral field spectroscopic data of M33