Astrophys. J., 739, 100 (2011/October-1)
A 205 µm [N II] map of the Carina nebula.
OBERST T.E., PARSHLEY S.C., NIKOLA T., STACEY G.J., LOHR A., LANE A.P., STARK A.A. and KAMENETZKY J.
Abstract (from CDS):
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.
H II regions - infrared: ISM - ISM: individual: Carina Nebula - ISM: lines and bands - photon-dominated region, PDR - submillimeter: ISM
VizieR on-line data:
<Available at CDS (J/ApJ/739/100): table3.dat table4.dat table5.dat>
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