Schneider, N., Bontemps, S., Girichidis, P., Rayner, T., Motte, F., Andre, Ph, Russeil, D., Abergel, A., Anderson, L., Arzoumanian, D., Benedettini, M., Csengeri, T., Didelon, P., Di Francesco, J., Griffin, M., Hill, T., Klessen, R. S., Ossenkopf, V., Pezzuto, S., Rivera-Ingraham, A., Spinoglio, L., Tremblin, P. and Zavagno, A. (2015). Detection of two power-law tails in the probability distribution functions of massive GMCs. Mon. Not. Roy. Astron. Soc., 453 (1). S. L41 - 5. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We report the novel detection of complex high column density tails in the probability distribution functions (PDFs) for three high-mass star-forming regions (CepOB3, MonR2, NGC 6334), obtained from dust emission observed withHerschel. The low column density range can be fitted with a lognormal distribution. A first power-law tail starts above an extinctionof similar to 6-14. It has a slope of alpha = 1.3-2 for the rho aaEuro profile for an equivalent density distribution (spherical or cylindrical geometry), and is thus consistent with free-fall gravitational collapse. AboveA(V) similar to 40, 60, and 140, we detect an excess that can be fitted by a flatter power-law tail with alpha > 2. It correlates with the central regions of the cloud (ridges/hubs) of size similar to 1 pc and densities above 10(4) cm(-3). This excess may be caused by physical processes that slow down collapse and reduce the flow of mass towards higher densities. Possible are: (1) rotation, which introduces an angular momentum barrier, (2) increasing optical depth and weaker cooling, (3) magnetic fields, (4) geometrical effects, and (5) protostellar feedback. The excess/second power-law tail is closely linked to high-mass star-formation though it does not imply a universal column density threshold for the formation of (high-mass) stars.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Schneider, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bontemps, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Girichidis, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rayner, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Motte, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Andre, PhUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Russeil, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Abergel, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Anderson, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Arzoumanian, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Benedettini, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csengeri, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Didelon, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Di Francesco, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Griffin, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hill, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klessen, R. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ossenkopf, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pezzuto, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rivera-Ingraham, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Spinoglio, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tremblin, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zavagno, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-389934
DOI: 10.1093/mnrasl/slv101
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 453
Number: 1
Page Range: S. L41 - 5
Date: 2015
Publisher: OXFORD UNIV PRESS
Place of Publication: OXFORD
ISSN: 1365-2966
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MOLECULAR CLOUDS; STAR-FORMATION; COLUMN DENSITY; HERSCHEL; FILAMENTS; TURBULENCE; ACCRETION; ORION; R2Multiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/38993

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