Crockett, Nathan R., Bergin, Edwin A., Neill, Justin L., Favre, Cecile, Schilke, Peter, Lis, Dariusz C., Bell, Tom A., Blake, Geoffrey, Cernicharo, Jose ORCID: 0000-0002-3518-2524, Emprechtinger, Martin, Esplugues, Gisela B., Gupta, Harshal, Kleshcheva, Maria, Lord, Steven, Marcelino, Nuria ORCID: 0000-0001-7236-4047, McGuire, Brett A., Pearson, John, Phillips, Thomas G., Plume, Rene ORCID: 0000-0002-6482-8945, van der Tak, Floris, Tercero, Belen and Yu, Shanshan ORCID: 0000-0002-2472-7998 (2014). HERSCHEL OBSERVATIONS OF EXTRAORDINARY SOURCES: ANALYSIS OF THE HIFI 1.2 THz WIDE SPECTRAL SURVEY TOWARD ORION KL. I. METHODS. Astrophys. J., 787 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We present a comprehensive analysis of a broadband spectral line survey of the Orion Kleinmann-Low nebula (Orion KL), one of the most chemically rich regions in the Galaxy, using the HIFI instrument on board the Herschel Space Observatory. This survey spans a frequency range from 480 to 1907 GHz at a resolution of 1.1 MHz. These observations thus encompass the largest spectral coverage ever obtained toward this high-mass star-forming region in the submillimeter with high spectral resolution and include frequencies > 1 THz, where the Earth's atmosphere prevents observations from the ground. In all, we detect emission from 39 molecules (79 isotopologues). Combining this data set with ground-based millimeter spectroscopy obtained with the IRAM 30 m telescope, we model the molecular emission from the millimeter to the far-IR using the XCLASS program, which assumes local thermodynamic equilibrium (LTE). Several molecules are also modeled with the MADEX non-LTE code. Because of the wide frequency coverage, our models are constrained by transitions over an unprecedented range in excitation energy. A reduced chi(2) analysis indicates that models for most species reproduce the observed emission well. In particular, most complex organics are well fit by LTE implying gas densities are high (> 10(6) cm(-3)) and excitation temperatures and column densities are well constrained. Molecular abundances are computed using H-2 column densities also derived from the HIFI survey. The distribution of rotation temperatures, T-rot, for molecules detected toward the hot core is significantly wider than the compact ridge, plateau, and extended ridge T-rot distributions, indicating the hot core has the most complex thermal structure.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Crockett, Nathan R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bergin, Edwin A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Neill, Justin L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Favre, CecileUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, PeterUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lis, Dariusz C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bell, Tom A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blake, GeoffreyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cernicharo, JoseUNSPECIFIEDorcid.org/0000-0002-3518-2524UNSPECIFIED
Emprechtinger, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Esplugues, Gisela B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gupta, HarshalUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kleshcheva, MariaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lord, StevenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marcelino, NuriaUNSPECIFIEDorcid.org/0000-0001-7236-4047UNSPECIFIED
McGuire, Brett A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pearson, JohnUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Phillips, Thomas G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plume, ReneUNSPECIFIEDorcid.org/0000-0002-6482-8945UNSPECIFIED
van der Tak, FlorisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tercero, BelenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yu, ShanshanUNSPECIFIEDorcid.org/0000-0002-2472-7998UNSPECIFIED
URN: urn:nbn:de:hbz:38-437122
DOI: 10.1088/0004-637X/787/2/112
Journal or Publication Title: Astrophys. J.
Volume: 787
Number: 2
Date: 2014
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-4357
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MOLECULAR LINE SURVEY; KLEINMANN-LOW NEBULA; STAR-FORMING REGION; LIMITED MILLIMETER SURVEY; RADIO-SOURCE-I; SUBMILLIMETER ARRAY; SOURCES HEXOS; APERTURE SYNTHESIS; HOT CORE; INTERSTELLAR-MOLECULESMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/43712

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