Modeling ionized gas in low-metallicity environments: the Local Group dwarf galaxy IC10

Abstract

Our objective is to investigate the physical properties of the ionised gas of the low-metallicity dwarf galaxy, IC 10, at various spatial scales: from individual HII regions to the entire galaxy scale and examine whether diagnostics for integrated measurements introduce bias in the results. We modeled the ionised gas combining the mid- and far-infrared fine-structure cooling lines observed with Spitzer/IRS and Herschel/PACS, with the photoionisation code Cloudy. The free parameters of the models are the age of the stellar cluster, the density and the ionisation parameter of the ionised gas as well as the depth of the cloud. The latter is used to investigate the leakage of the ionising photons from the analysed regions of IC 10. We investigate HII regions in the main star-forming body, on scales of ~25 pc, three in the main star-forming region in the center of the galaxy and two on the first arc. We then consider larger sizes on the scale of ~200 pc. We find that most clumps have nearly identical properties, density ~10${}^{2.}$ - 10${}^{2.6}$ cm${}^{-3}$, ionisation parameter between 10${}^{-2.2}$ and 10${}^{-1.6}$ and age of the stellar cluster ~5.5 Myr. All of them are matter-bounded regions, allowing ionising photons to leak. The relatively uniform physical properties of the clumps suggest a common origin for their star formation activity, which could be related to the feedback from stellar winds or supernovae of a previous generation of stars. The properties derived for ~200 pc size "zones" have similar properties as the HII regions they encompass, but with the larger regions tending to be more radiation-bounded. Finally, we investigate the fraction of [CII] 157.7 μm, [SiII] 34.8 μm, and [FeII] 25.9 μm, emission arising from the ionised gas phase and we find that most of the emission originates from the neutral gas, not from the ionised gas.

arXiv commentaccepted for publication in A&A

References in corpus (58)

• The chemical composition of the Sun
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Spitzer Space Telescope Mission
• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Infrared Spectrograph on the Spitzer Space Telescope
• Gas-to-Dust mass ratios in local galaxies over a 2 dex metallicity range
• The 2013 Release of Cloudy
• A Library of Theoretical Ultraviolet Spectra of Massive, Hot Stars for Evolutionary Synthesis
• CASSIS: The Cornell Atlas of Spitzer/IRS Sources
• Star Formation Properties of a Large Sample of Irregular Galaxies
• An Overview of the Dwarf Galaxy Survey
• The Formation and Destruction of Molecular Clouds and Galactic Star Formation
• Metallicity Gradients and Gas Flows in Galaxy Pairs
• The Interstellar dust properties of nearby galaxies
• Spectral Mapping Reconstruction of Extended Sources
• The Herschel Dwarf Galaxy Survey: I. Properties of the low-metallicity ISM from PACS spectroscopy
• Escape of Lyman continuum radiation from local galaxies - Detection of leakage from the young starburst Tol 1247-232
• Detection of the 205 um [NII] Line from the Carina Nebula
• The H II Region/PDR Connection: Self-Consistent Calculations of Physical Conditions in Star-Forming Regions
• Molecular Gas in the Low Metallicity, Star Forming Dwarf IC 10
• DustPedia: Multiwavelength Photometry and Imagery of 875 Nearby Galaxies in 42 Ultraviolet--Microwave Bands
• Measuring the Sources of the Intergalactic Ionizing Flux
• CASSIS: The Cornell Atlas of Spitzer/Infrared Spectrograph Sources. II. High-resolution observations
• Global Physical Conditions of the Interstellar Medium in Nearby Galaxies
• The nature of the interstellar medium of the starburst low-metallicity galaxy Haro11: a multi-phase model of the infrared emission
• Physical conditions in the gas phases of the giant HII region LMC-N11 unveiled by Herschel - I. Diffuse [CII] and [OIII] emission in LMC-N11B
• A Spectroscopic Search for Leaking Lyman Continuum at z~0.7
• Supergiant Shells and Molecular Cloud Formation in the LMC
• Mid-Infrared Fine Structure Line Ratios in Active Galactic Nuclei Observed with Spitzer IRS: Evidence for Extinction by the Torus
• Gemini observations of Wolf-Rayet Stars in the Local Group Starburst Galaxy IC10
• The Stellar Population and Star Clusters in the Unusual Local Group Galaxy IC 10
• Cepheid and Tip of the Red Giant Branch Distances To the Dwarf Irregular Galaxy IC10
• Photoionization models of the CALIFA HII regions. I. Hybrid models
• Wolf-Rayets in IC10: Probing the Nearest Starburst
• IC 10: More evidence that it is a blue compact dwarf
• A milestone toward understanding PDR properties in the extreme environment of LMC-30Dor
• IC10: the history of the nearest starburst galaxy through its Planetary Nebula and HII region populations
• Evidence for an Interaction in the Nearest Starbursting Dwarf Irregular Galaxy IC 10
• A Dust spectral energy distribution model with hierarchical Bayesian inference. I. Formalism & benchmarking
• Neutral gas heating by X-rays in primitive galaxies: Infrared observations of IZw18 with Herschel
• The H+ Region Contribution to [C II] 158 Micron Emission
• The ionized gas at the center of IC 10: A possible localized chemical pollution by Wolf-Rayet stars
• Imaging of the Stellar Population of IC10 with Laser Guide Star Adaptive Optics and the Hubble Space Telescope
• The HI Chronicles of LITTLE THINGS BCDs II: The Origin of IC 10's HI Structure
• Reddening and Distance of the Local Group Starburst Galaxy IC 10
• A Young GMC Formed at the Interface of Two Colliding Supershells: Observations Meet Simulations
• Exploring the making of a galactic wind in the star-bursting dwarf irregular galaxy IC 10 with LOFAR
• What can emission lines tell us?
• The chemical evolution of IC10
• The Star Cluster System in the Local Group Starburst Galaxy IC 10
• On the stellar content of the starburst galaxy IC10
• Radiative and mechanical feedback into the molecular gas in the Large Magellanic Cloud. I. N159W
• Physical Conditions in the Dwarf Local Group Irregular Galaxy IC10. I- Diffuse Ionized Gas
• Modeling the physical properties in the ISM of the low-metallicity galaxy NGC4214
• Widely Extended [OIII] 88 um Line Emission around the 30 Doradus Region Revealed with AKARI FIS-FTS
• Oxygen-rich dust production in IC 10
• Ionized Gas in the Irr Galaxy IC 10: The Emission Spectrum and Ionization Sources

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