Goicoechea, Javier R. ORCID: 0000-0001-7046-4319, Teyssier, D., Etxaluze, M., Goldsmith, P. F., Ossenkopf, V., Gerin, M., Bergin, E. A., Black, J. H., Cernicharo, J., Cuadrado, S., Encrenaz, P., Falgarone, E., Fuente, A., Hacar, A., Lis, D. C., Marcelino, N., Melnick, G. J., Mueller, H. S. P., Persson, C., Pety, J., Roellig, M., Schilke, P., Simon, R., Snell, R. L. and Stutzki, J. (2015). VELOCITY-RESOLVED [CII] EMISSION AND [CII]/FIR MAPPING ALONG ORION WITH HERSCHEL. Astrophys. J., 812 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We present the first similar to 7'.5 x 11'.5 velocity-resolved (similar to 0.2 km s(-1)) map of the [C II] 158 mu m line toward the Orion molecular cloud 1 (OMC 1) taken with the Herschel/HIFI instrument. In combination with far-IR (FIR) photometric images and velocity-resolved maps of the H41 alpha hydrogen recombination and CO J = 2-1 lines, this data set provides an unprecedented view of the intricate small-scale kinematics of the ionized/photodissociation region (PDR)/molecular gas interfaces and of the radiative feedback from massive stars. The main contribution to the [C II] luminosity (similar to 85%) is from the extended, FUV-illuminated face of the cloud (G(0) > 500, n(H) > 5 x 10(3) cm(-3)) and from dense PDRs (G(0) greater than or similar to 10(4), n(H) greater than or similar to 10(5) cm(-3)) at the interface between OMC 1 and the H II region surrounding the Trapezium cluster. Around similar to 15% of the [C II] emission arises from a different gas component without a CO counterpart. The [C II] excitation, PDR gas turbulence, line opacity (from [C-13 II]), and role of the geometry of the illuminating stars with respect to the cloud are investigated. We construct maps of the L[C II]/L-FIR and L-FIR/M-Gas ratios and show that L[C II]/L-FIR decreases from the extended cloud component (similar to 10(-2)-10(-3)) to the more opaque star-forming cores (similar to 10(-3)-10(-4)). The lowest values are reminiscent of the [C II] deficit seen in local ultraluminous IR galaxies hosting vigorous star formation. Spatial correlation analysis shows that the decreasing L[C II]/L-FIR ratio correlates better with the column density of dust through the molecular cloud than with L-FIR/M-Gas. We conclude that the [C II]-emitting column relative to the total dust column along each line of sight is responsible for the observed L[C II]/L-FIR variations through the cloud.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Goicoechea, Javier R.UNSPECIFIEDorcid.org/0000-0001-7046-4319UNSPECIFIED
Teyssier, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Etxaluze, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goldsmith, P. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ossenkopf, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gerin, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bergin, E. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Black, J. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cernicharo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cuadrado, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Encrenaz, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Falgarone, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fuente, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hacar, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lis, D. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marcelino, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Melnick, G. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, H. S. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Persson, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pety, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Roellig, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Simon, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Snell, R. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stutzki, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-389942
DOI: 10.1088/0004-637X/812/1/75
Journal or Publication Title: Astrophys. J.
Volume: 812
Number: 1
Date: 2015
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-4357
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
C-II LINE; NONEQUILIBRIUM PHOTODISSOCIATION REGIONS; POLYCYCLIC AROMATIC-HYDROCARBONS; SPACE-OBSERVATORY MEASUREMENTS; DIFFUSE INTERSTELLAR-MEDIUM; FAR-INFRARED SPECTROSCOPY; STAR-FORMATION RATES; SIMILAR-TO 1-2; MOLECULAR CLOUDS; PHYSICAL CONDITIONSMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/38994

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