Universität zu Köln

Tahani, K., Plume, R., Bergin, E. A., Tolls, V., Phillips, T. G., Caux, E., Cabrit, S., Goicoechea, J. R., Goldsmith, P. F., Johnstone, D., Lis, D. C., Pagani, L., Menten, K. M., Mueller, H. S. P., Ossenkopf-Okada, V., Pearson, J. C. and van der Tak, F. F. S. (2016). ANALYSIS OF THE HERSCHEL/HEXOS SPECTRAL SURVEY TOWARD ORION SOUTH: A MASSIVE PROTOSTELLAR ENVELOPE WITH STRONG EXTERNAL IRRADIATION. Astrophys. J., 832 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We present results from a comprehensive submillimeter spectral survey toward the source Orion South, based on data obtained with the Heterodyne Instrument for the Far-Infrared instrument on board the Herschel Space Observatory, covering the frequency range of 480 to 1900 GHz. We detect 685 spectral lines with signal-to-noise ratios (S/Ns) > 3 sigma, originating from 52 different molecular and atomic species. We model each of the detected species assuming conditions of Local Thermodynamic Equilibrium. This analysis provides an estimate of the physical conditions of Orion South (column density, temperature, source size, and VLSR). We find evidence for three different cloud components: a cool (T-ex similar to 20-40 K), spatially extended (> 60 ''), and quiescent (Delta V-FWHM similar to 4 km s(-1)) component; a warmer (T-ex similar to 80-100 K), less spatially extended (similar to 30 ''), and dynamic (Delta V-FWHM similar to 8 km s(-1)) component, which is likely affected by embedded outflows; and a kinematically distinct region (T-ex > 100 K; V-LSR similar to 8 km s(-1)), dominated by emission from species that trace ultraviolet irradiation, likely at the surface of the cloud. We find little evidence for the existence of a chemically distinct hot-core component, likely due to the small filling factor of the hot core or hot cores within the Herschel beam. We find that the chemical composition of the gas in the cooler, quiescent component of Orion South more closely resembles that of the quiescent ridge in Orion-KL. The gas in the warmer, dynamic component, however, more closely resembles that of the Compact Ridge and Plateau regions of Orion-KL, suggesting that higher temperatures and shocks also have an influence on the overall chemistry of Orion South.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tahani, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Plume, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bergin, E. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tolls, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Phillips, T. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Caux, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cabrit, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goicoechea, J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goldsmith, P. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Johnstone, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lis, D. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pagani, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, K. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, H. S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ossenkopf-Okada, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pearson, J. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Tak, F. F. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-255582
DOI:	10.3847/0004-637X/832/1/12
Journal or Publication Title:	Astrophys. J.
Volume:	832
Number:	1
Date:	2016
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLECULAR LINE SURVEY; EXTRAORDINARY SOURCES ANALYSIS; LIMITED MILLIMETER SURVEY; STAR-FORMING REGIONS; CLOUD CORES; MU-M; SUBMILLIMETER ARRAY; OBSERVATIONAL DATA; INTERSTELLAR JETS; ODIN SATELLITE Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25558