2010A&A...518L..79O


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.19CEST05:32:48

2010A&A...518L..79O - Astronomy and Astrophysics, volume 518, L79-79 (2010/7-2)

HIFI observations of warm gas in DR 21: shock versus radiative heating.

OSSENKOPF V., ROELLIG M., SIMON R., SCHNEIDER N., OKADA Y., STUTZKI J., GERIN M., AKYILMAZ M., BEINTEMA D., BENZ A.O., BERNE O., BOULANGER F., BUMBLE B., COEUR-JOLY O., DEDES C., DIEZ-GONZALEZ M.C., FRANCE K., FUENTE A., GALLEGO J.D., GOICOECHEA J.R., GUESTEN R., HARRIS A., HIGGINS R., JACKSON B., JARCHOW C., JOBLIN C., KLEIN T., KRAMER C., LORD S., MARTIN P., MARTIN-PINTADO J., MOOKERJEA B., NEUFELD D.A., PHILLIPS T., RIZZO J.R., VAN DER TAK F.F.S., TEYSSIER D. and YORKE H.

Abstract (from CDS):

The molecular gas in the DR21 massive star formation region is known to be affected by the strong UV field from the central star cluster and by a fast outflow creating a bright shock. The relative contribution of both heating mechanisms is the matter of a long debate. By better sampling the excitation ladder of various tracers we provide a quantitative distinction between the different heating mechanisms. HIFI observations of mid-J transitions of CO and HCO+ isotopes allow us to bridge the gap in excitation energies between observations from the ground, characterizing the cooler gas, and existing ISO LWS spectra, constraining the properties of the hot gas. Comparing the detailed line profiles allows to identify the physical structure of the different components. In spite of the known shock-excitation of H2 and the clearly visible strong outflow, we find that the emission of all lines up to >2THz can be explained by purely radiative heating of the material. However, the new Herschel/HIFI observations reveal two types of excitation conditions. We find hot and dense clumps close to the central cluster, probably dynamically affected by the outflow, and a more widespread distribution of cooler, but nevertheless dense, molecular clumps.

Abstract Copyright:

Journal keyword(s): ISM: structure - ISM: kinematics and dynamics - ISM: molecules - HII regions - submillimeter: ISM

Simbad objects: 2

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Number of rows : 2

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 Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 360 1
2 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 947 0

    Equat.    Gal    SGal    Ecl

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2020.09.19-05:32:48

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