Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...739..100o&link_type=abstract
The Astrophysical Journal, Volume 739, Issue 2, article id. 100 (2011).
Astronomy and Astrophysics
Astronomy
1
H Ii Regions, Infrared: Ism, Ism: Individual Objects: Carina Nebula, Ism: Lines And Bands, Photon-Dominated Region: Pdr, Submillimeter: Ism
Scientific paper
We present the results of a ~250 arcmin2 mapping of the 205 μm [N II] fine-structure emission over the northern Carina Nebula, including the Car I and Car II H II regions. Spectra were obtained using the South Pole Imaging Fabry-Perot Interferometer (SPIFI) at the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO) at the South Pole. We supplement the 205 μm data with new reductions of far-IR fine-structure spectra from the Infrared Space Observatory (ISO) Long Wavelength Spectrometer (LWS) in 63 μm [O I], 122 μm [N II], 146 μm [O I], and 158 μm [C II]; the 146 μm [O I] data include 90 raster positions which have not been previously published. Morphological comparisons are made with optical, radio continuum, and CO maps. The 122/205 line ratio is used to probe the density of the low-ionization gas, and the 158/205 line ratio is used to probe the fraction of C+ arising from photodissociation regions (PDRs). The [O I] and [C II] lines are used to construct a PDR model of Carina. When the PDR properties are compared with other sources, Carina is found to be more akin to 30 Doradus than galactic star-forming regions such as Orion, M17, or W49; this is consistent with the view of Carina as a more evolved region, where much of the parent molecular cloud has been ionized or swept away. These data constitute the first ground-based detection of the 205 μm [N II] line, and the third detection overall since those of COBE FIRAS and the Kuiper Airborne Observatory in the early 1990s.
Kamenetzky Julia
Lane Adair P.
Löhr A.
Nikola Thomas
Oberst Thomas Edward
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