Details

Autor(en) / Beteiligte

• Yeh, Sherry C. C.
• Seaquist, Ernest R.
• Matzner, Christopher D.
• Pellegrini, Eric W.

Titel

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

Ist Teil von

• The Astrophysical journal, 2015-07, Vol.807 (2), p.1-10

Ort / Verlag

United States: The American Astronomical Society

Erscheinungsjahr

2015

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 <104 cm−3. Comparisons with Brγ, 8 m, and CO emission indicate that H2 emission is due to fluorescence, and provide no evidence for shock excited emission of this line.