Submillimeter detection of extragalactic C I emission: IC 342

Thomas H. Büttgenbach, Jocelyn Keene, T. G. Phillips, Christopher K Walker

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We report observations of the 3P13P0 transition of atomic carbon at 492 GHz in IC 342, made at the Caltech Submillimeter Observatory, which represent the first extragalactic submillimeter detection of C I. The C I emission from IC 342 was found to have a main beam temperature of about 1 K, which is a factor of 2 greater than that for 13CO(2 → 1) in the same size beam. Comparing our data with COBE observations of the Milky Way, we find that the ratio of C I to CO(2 → 1) is approximately a factor of 2 lower in IC 342 than in our Galaxy. The result is interpreted in terms of photodissociation region models which require higher gas densities for IC 342 than for the Milky Way.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume397
Issue number1 PART 2
StatePublished - Sep 20 1992

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observatory
Cosmic Background Explorer satellite
carbon
gas density
gas
photodissociation
observatories
temperature
galaxies
detection

Keywords

  • Galaxies: individual: IC 342
  • Galaxies: interstellar matter
  • Infrared: interstellar: lines
  • ISM: general
  • Radio lines: atomic
  • Radio lines: molecular: interstellar

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Büttgenbach, T. H., Keene, J., Phillips, T. G., & Walker, C. K. (1992). Submillimeter detection of extragalactic C I emission: IC 342. Astrophysical Journal, 397(1 PART 2).

Submillimeter detection of extragalactic C I emission : IC 342. / Büttgenbach, Thomas H.; Keene, Jocelyn; Phillips, T. G.; Walker, Christopher K.

In: Astrophysical Journal, Vol. 397, No. 1 PART 2, 20.09.1992.

Research output: Contribution to journalArticle

Büttgenbach, TH, Keene, J, Phillips, TG & Walker, CK 1992, 'Submillimeter detection of extragalactic C I emission: IC 342', Astrophysical Journal, vol. 397, no. 1 PART 2.
Büttgenbach TH, Keene J, Phillips TG, Walker CK. Submillimeter detection of extragalactic C I emission: IC 342. Astrophysical Journal. 1992 Sep 20;397(1 PART 2).
Büttgenbach, Thomas H. ; Keene, Jocelyn ; Phillips, T. G. ; Walker, Christopher K. / Submillimeter detection of extragalactic C I emission : IC 342. In: Astrophysical Journal. 1992 ; Vol. 397, No. 1 PART 2.
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abstract = "We report observations of the 3P1 → 3P0 transition of atomic carbon at 492 GHz in IC 342, made at the Caltech Submillimeter Observatory, which represent the first extragalactic submillimeter detection of C I. The C I emission from IC 342 was found to have a main beam temperature of about 1 K, which is a factor of 2 greater than that for 13CO(2 → 1) in the same size beam. Comparing our data with COBE observations of the Milky Way, we find that the ratio of C I to CO(2 → 1) is approximately a factor of 2 lower in IC 342 than in our Galaxy. The result is interpreted in terms of photodissociation region models which require higher gas densities for IC 342 than for the Milky Way.",
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