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26 April 2024 |
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Detection of the 205 um [NII] Line from the Carina Nebula | | T.E. Oberst
; S.C. Parshley
; G.J. Stacey
; T. Nikola
; A. Loehr
; J.I.Harnett
; N.F.H. Tothill
; A.P. Lane
; A.A. Stark
; C.E. Tucker
; | | Date: |
20 Oct 2006 | | Abstract: | We report the first detection of the 205 um 3P1 - 3P0 [NII] line from a ground-based observatory using a direct detection spectrometer. The line was detected from the Carina star formation region using the South Pole Imaging Fabry-Perot Interferometer (SPIFI) on the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO) at South Pole. The [NII] 205 um line strength indicates a low-density (n ~ 32 cm^-3 ionized medium, similar to the low-density ionized halo reported previously in its [OIII] 52 and 88 um line emission. When compared with the ISO [CII] observations of this region, we find that ~27% of the [CII] line emission arises from this low-density ionized gas, but the large majority ~ 73% of the observed [CII] line emission arises from the neutral interstellar medium. This result supports and underpins prior conclusions that most of the observed [CII] 158 um line emission from Galactic and extragalactic sources arises from the warm, dense photodissociated surfaces of molecular clouds. The detection of the [NII] line demonstrates the utility of Antarctic sites for THz spectroscopy. | | Source: | arXiv, astro-ph/0610636 | | Services: | Forum | Review | PDF | Favorites | |
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