Dense cores in the Orion molecular cloud

T. L. Wilson, R. Mauersberger, P. D. Gensheimer, D. Muders, John H Bieging

Research output: Contribution to journalArticle

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Abstract

We have used the Heinrich Hertz submillimeter telescope to measure the J = 3-2 and J = 2-1 lines of 12C16O and 12C18O, and the J = 3-2 line of 13C16O toward 125 high-density cores in the prominent S-shaped feature in L1640. We have also measured the (J, K)=(1,1) and (2,2) inversion transitions of NH3 from these sources. These results have been used to determine kinetic temperatures, H2 densities, and column densities. Estimates of the stability of these cores are made. Comparisons are also made with other nearby star formation regions such as the Taurus clouds. Sources in the northern part of the region surveyed have larger line widths, kinetic temperatures, Tk, and higher ratios of the J = 3-2 to J = 2-1 lines of C18O. It is likely that these sources are heated externally. Except for cores in the southern part of this cloud, Tk exceeds; 10 K, the value found for dark dust clouds. The average density for all cores is ∼3 × 104 cm-3. Orion KL is an extraordinary source, with much larger Tk, local density, and column density than any other source in our sample.

Original languageEnglish (US)
Pages (from-to)343-356
Number of pages14
JournalAstrophysical Journal
Volume525
Issue number1 PART 1
StatePublished - Nov 1 1999

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molecular clouds
kinetics
star formation
dust
temperature
telescopes
inversions
estimates

Keywords

  • ISM: individual (Orion Streamer)
  • ISM: molecules
  • Radio lines: ISM
  • Submillimeter

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Wilson, T. L., Mauersberger, R., Gensheimer, P. D., Muders, D., & Bieging, J. H. (1999). Dense cores in the Orion molecular cloud. Astrophysical Journal, 525(1 PART 1), 343-356.

Dense cores in the Orion molecular cloud. / Wilson, T. L.; Mauersberger, R.; Gensheimer, P. D.; Muders, D.; Bieging, John H.

In: Astrophysical Journal, Vol. 525, No. 1 PART 1, 01.11.1999, p. 343-356.

Research output: Contribution to journalArticle

Wilson, TL, Mauersberger, R, Gensheimer, PD, Muders, D & Bieging, JH 1999, 'Dense cores in the Orion molecular cloud', Astrophysical Journal, vol. 525, no. 1 PART 1, pp. 343-356.
Wilson TL, Mauersberger R, Gensheimer PD, Muders D, Bieging JH. Dense cores in the Orion molecular cloud. Astrophysical Journal. 1999 Nov 1;525(1 PART 1):343-356.
Wilson, T. L. ; Mauersberger, R. ; Gensheimer, P. D. ; Muders, D. ; Bieging, John H. / Dense cores in the Orion molecular cloud. In: Astrophysical Journal. 1999 ; Vol. 525, No. 1 PART 1. pp. 343-356.
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