Widely Extended [OIII] 88 um Line Emission around the 30 Doradus Region Revealed with AKARI FIS-FTS

Abstract

We present the distribution map of the far-infrared [OIII] 88um line emission around the 30 Doradus (30 Dor) region in the Large Magellanic Cloud obtained with the Fourier Transform Spectrometer of the Far-Infrared Surveyor onboard AKARI. The map reveals that the [OIII] emission is widely distributed by more than 10' around the super star cluster R136, implying that the 30 Dor region is affluent with interstellar radiation field hard enough to ionize O^{2+}. The observed [OIII] line intensities are as high as (1-2) x 10^{-6} W m^{-2} sr^{-1} on the peripheral regions 4'-5' away from the center of 30 Dor, which requires gas densities of 60-100 cm^{-3}. However the observed size of the distribution of the [OIII] emission is too large to be explained by massive stars in the 30 Dor region enshrouded by clouds with the constant gas density of 10^2 cm^{-3}. Therefore the surrounding structure is likely to be highly clumpy. We also find a global correlation between the [OIII] and the far-infrared continuum emission, suggesting that the gas and dust are well mixed in the highly-ionized region where the dust survives in clumpy dense clouds shielded from the energetic photons.

arXiv comment17 pages, 9 figures, accepted for publication in Publications of the Astronomical Society of Japan (PASJ)

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• The Infrared Astronomical Mission AKARI
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• The Infrared Camera (IRC) for AKARI - Design and Imaging Performance
• The Far-Infrared Surveyor (FIS) for AKARI
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• Thermal and Non-thermal X-Rays from the LMC Super Bubble 30 Dor C
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• Physical Conditions in the Ionized Gas of 30 Doradus
• Suzaku Observation of 30Dor C: A Supernova Remnant with the Largest Non-Thermal Shell
• Performance of the Imaging Fourier Transform Spectrometer with Photoconductive Detector Arrays: An Application for the AKARI Far-Infrared Instrument
• Calibration of the AKARI Far-Infrared Imaging Fourier Transform Spectrometer

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• 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
• Spatially-resolved dust properties of the GRB 980425 host galaxy
• The CO-dark molecular gas mass in 30 Doradus
• ALMA will determine the spectroscopic redshift z>8 with FIR [O III] emission lines
• Velocity profiles of [CII], [CI], CO, and [OI] and physical conditions in four star-forming regions in the Large Magellanic Cloud
• Modeling ionized gas in low-metallicity environments: the Local Group dwarf galaxy IC10
• Bridging Optical and Far-Infrared Emission-Line Diagrams of Galaxies from Local to the Epoch of Reionization: Characteristic High [O III] 88 $\mu \mathrm{m}$/SFR at $z>6$
• LMC+: Large-scale mapping of [CII] and [OIII] in the LMC molecular ridge, I. Dataset and line ratio analyses