MOLECULAR AND IONIZED HYDROGEN IN 30 DORADUS. I. IMAGING OBSERVATIONS

ABSTRACT We present the first fully calibrated H2 1-0 S(1) image of the entire 30 Doradus nebula. The observations were conducted using the NOAO Extremely Wide-field Infrared Imager (NEWFIRM) on the CTIO 4 m Blanco Telescope. Together with a NEWFIRM Brγ image of 30 Doradus, our data reveal the morph...

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Bibliographic Details
Published in:The Astrophysical journal 2015-07, Vol.807 (2), p.1-10
Main Authors: Yeh, Sherry C. C., Seaquist, Ernest R., Matzner, Christopher D., Pellegrini, Eric W.
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Calibration
CARBON MONOXIDE
Clumps
COMPARATIVE EVALUATIONS
DENSITY
DISSOCIATION
EMISSION
FLUORESCENCE
H II regions
HYDROGEN
Infrared
infrared: ISM
Ionization
ISM: bubbles
ISM: molecules
MAGELLANIC CLOUDS
MOLECULES
MORPHOLOGY
NEBULAE
PHOTOLYSIS
photon-dominated region (PDR)
PHOTONS
regions
TELESCOPES
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Summary:ABSTRACT We present the first fully calibrated H2 1-0 S(1) image of the entire 30 Doradus nebula. The observations were conducted using the NOAO Extremely Wide-field Infrared Imager (NEWFIRM) on the CTIO 4 m Blanco Telescope. Together with a NEWFIRM Brγ image of 30 Doradus, our data reveal the morphologies of the warm molecular gas and ionized gas in 30 Doradus. The brightest H2-emitting area, which extends from the northeast to the southwest of R136, is a photodissociation region (PDR) viewed face-on, while many clumps and pillar features located at the outer shells of 30 Doradus are PDRs viewed edge-on. Based on the morphologies of H2, Brγ, CO, and 8 m emission, the H2 to Brγ line ratio, and Cloudy models, we find that the H2 emission is formed inside the PDRs of 30 Doradus, 2-3 pc to the ionization front of the H ii region, in a relatively low-density environment
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.1088/0004-637X/807/2/117