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Detection of the 205 μm [NII] Line from the Carina Nebula

Stacey, G. J., Oberst, T. E., Loehr, A., Nikolal, T., Parshley, S. C., Tothill, N. F. H., Harnett,, J. I., Lane, A. P., Stark, A. A. and Tucker, Carole ORCID: 2006. Detection of the 205 μm [NII] Line from the Carina Nebula. Presented at: 17th International Symposium on Space Terahertz Technology (ISSTT 2006), Paris, 10-12 May 2006. Published in: Maestrini, Dr. Alain and Beaudin, Dr. Gerard eds. Proceedings of the 17thInternational Symposion on Space Terahertz Technology Paris May 10-12, 2006. ISSTT Proceedings Observatoire de Paris, LERMA: Kluwer Academic, p. 302.

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We report the first detection of the 205 micron 3P1-3P0 [NII] line from a ground based observatory using a direct detection spectrometer. The line was detected and mapped in emission from the Carina star formation region in the Galaxy using the South Pole Imaging Fabry-Perot Interfereometer (SPIFI) on the Antarctic Submillimeter Telescope and Remote Observatory AST/RO at the South Pole. The [NII] line is an important coolant for the diffuse ionized ISM, and (together with the 122 um [NII] line) is an excellent probe of gas density. The [NH] 205 micron line emission peaks at the Carina II HII region, and its strength indicates a low density (n < 30 cm-3) ionized medium. When compared with the ISO [CII] observations of this region, we find about half the [CII] line emission arises from this low density ionized gas as well. The detection of this line demonstrates the utility of Antarctic sites for THz spectroscopy.

Item Type: Conference or Workshop Item (Poster)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Kluwer Academic
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Last Modified: 28 Oct 2022 08:35

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