Palau, Aina ORCID: 0000-0002-9569-9234, Ballesteros-Paredes, Javier, Vazquez-Semadeni, Enrique ORCID: 0000-0002-1424-3543, Sanchez-Monge, Alvaro ORCID: 0000-0002-3078-9482, Estalella, Robert ORCID: 0000-0001-7341-8641, Fall, S. Michael, Zapata, Luis A., Camacho, Vianey, Gomez, Laura, Naranjo-Romero, Raul, Busquet, Gemma and Fontani, Francesco (2015). Gravity or turbulence? - III. Evidence of pure thermal Jeans fragmentation at similar to 0.1 pc scale. Mon. Not. Roy. Astron. Soc., 453 (4). S. 3785 - 3798. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We combine previously published interferometric and single-dish data of relatively nearby massive dense cores that are actively forming stars to test whether their 'fragmentation level' is controlled by turbulent or thermal support. We find no clear correlation between the fragmentation level and velocity dispersion, nor between the observed number of fragments and the number of fragments expected when the gravitationally unstable mass is calculated including various prescriptions for 'turbulent support'. On the other hand, the best correlation is found for the case of pure thermal Jeans fragmentation, for which we infer a core formation efficiency around 13 per cent, consistent with previous works. We conclude that the dominant factor determining the fragmentation level of star-forming massive dense cores at 0.1 pc scale seems to be thermal Jeans fragmentation.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Palau, AinaUNSPECIFIEDorcid.org/0000-0002-9569-9234UNSPECIFIED
Ballesteros-Paredes, JavierUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vazquez-Semadeni, EnriqueUNSPECIFIEDorcid.org/0000-0002-1424-3543UNSPECIFIED
Sanchez-Monge, AlvaroUNSPECIFIEDorcid.org/0000-0002-3078-9482UNSPECIFIED
Estalella, RobertUNSPECIFIEDorcid.org/0000-0001-7341-8641UNSPECIFIED
Fall, S. MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zapata, Luis A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Camacho, VianeyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gomez, LauraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Naranjo-Romero, RaulUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Busquet, GemmaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fontani, FrancescoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-387079
DOI: 10.1093/mnras/stv1834
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 453
Number: 4
Page Range: S. 3785 - 3798
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
INITIAL MASS FUNCTION; MOLECULAR CLOUD EVOLUTION; STAR-FORMING REGIONS; PROBABILITY-DISTRIBUTION FUNCTIONS; YOUNG STELLAR OBJECTS; DENSE CORES; HIERARCHICAL FRAGMENTATION; FORMATION EFFICIENCY; CHEMICAL EVOLUTION; INFRARED SOURCESMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/38707

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