2011A&A...527A..95W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:55:57

2011A&A...527A..95W - Astronomy and Astrophysics, volume 527A, 95-95 (2011/3-1)

Herschel observations of EXtra-Ordinary Sources (HEXOS): methanol as a probe of physical conditions in Orion KL.

WANG S., BERGIN E.A., CROCKETT N.R., GOLDSMITH P.F., LIS D.C., PEARSON J.C., SCHILKE P., BELL T.A., COMITO C., BLAKE G.A., CAUX E., CECCARELLI C., CERNICHARO J., DANIEL F., DUBERNET M.-L., EMPRECHTINGER M., ENCRENAZ P., GERIN M., GIESEN T.F., GOICOECHEA J.R., GUPTA H., HERBST E., JOBLIN C., JOHNSTONE D., LANGER W.D., LATTER W.B., LORD S.D., MARET S., MARTIN P.G., MELNICK G.J., MENTEN K.M., MORRIS P., MUELLER H.S.P., MURPHY J.A., NEUFELD D.A., OSSENKOPF V., PERAULT M., PHILLIPS T.G., PLUME R., QIN S.-L., SCHLEMMER S., STUTZKI J., TRAPPE N., VAN DER TAK F.F.S., VASTEL C., YORKE H.W., YU S. and ZMUIDZINAS J.

Abstract (from CDS):

We have examined methanol emission from Orion KL with the Herschel/HIFI instrument, and detected two methanol bands centered at 524 GHz and 1061 GHz. The 524 GHz methanol band (observed in HIFI band 1a) is dominated by the isolated ΔJ=0, K=-4->-3, vt=0 Q branch, and includes 25 E-type and 2 A-type transitions. The 1061 GHz methanol band (observed in HIFI band 4b) is dominated by the ΔJ=0, K=7->6, vt=0 Q branch transitions which are mostly blended. We have used the isolated E-type vt=0 methanol transitions to explore the physical conditions in the molecular gas. With HIFI's high velocity resolution, the methanol emission contributed by different spatial components along the line of sight toward Orion KL (hot core, low velocity flow, and compact ridge) can be distinguished and studied separately. The isolated transitions detected in these bands cover a broad energy range (upper state energy ranging from 80K to 900K), which provides a unique probe of the thermal structure in each spatial component. The observations further show that the compact ridge is externally heated. These observations demonstrate the power of methanol lines as probes of the physical conditions in warm regions in close proximity to young stars.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: molecules

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME OMC1 Ridge reg 05 35 13.4 -05 23 07           ~ 123 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2001 1
3 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 175 0
4 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 848 1
5 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1909 1

    Equat.    Gal    SGal    Ecl

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2020.07.03-21:55:57

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