Palau, Aina ORCID: 0000-0002-9569-9234, Estalella, Robert ORCID: 0000-0001-7341-8641, Girart, Josep M., Fuente, Asuncion ORCID: 0000-0001-6317-6343, Fontani, Francesco ORCID: 0000-0003-0348-3418, Commercon, Benoit ORCID: 0000-0003-2407-1025, Busquet, Gemma, Bontemps, Sylvain, Sanchez-Monge, Alvaro ORCID: 0000-0002-3078-9482, Zapata, Luis A., Zhang, Qizhou ORCID: 0000-0003-2384-6589, Hennebelle, Patrick and di Francesco, James (2014). FRAGMENTATION OF MASSIVE DENSE CORES DOWN TO less than or similar to 1000 AU: RELATION BETWEEN FRAGMENTATION AND DENSITY STRUCTURE. Astrophys. J., 785 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

In order to shed light on the main physical processes controlling fragmentation of massive dense cores, we present a uniform study of the density structure of 19 massive dense cores, selected to be at similar evolutionary stages, for which their relative fragmentation level was assessed in a previous work. We inferred the density structure of the 19 cores through a simultaneous fit of the radial intensity profiles at 450 and 850 mu m (or 1.2 mm in two cases) and the spectral energy distribution, assuming spherical symmetry and that the density and temperature of the cores decrease with radius following power-laws. Even though the estimated fragmentation level is strictly speaking a lower limit, its relative value is significant and several trends could be explored with our data. We find a weak (inverse) trend of fragmentation level and density power-law index, with steeper density profiles tending to show lower fragmentation, and vice versa. In addition, we find a trend of fragmentation increasing with density within a given radius, which arises from a combination of flat density profile and high central density and is consistent with Jeans fragmentation. We considered the effects of rotational-to-gravitational energy ratio, non-thermal velocity dispersion, and turbulence mode on the density structure of the cores, and found that compressive turbulence seems to yield higher central densities. Finally, a possible explanation for the origin of cores with concentrated density profiles, which are the cores showing no fragmentation, could be related with a strong magnetic field, consistent with the outcome of radiation magnetohydrodynamic simulations.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Palau, AinaUNSPECIFIEDorcid.org/0000-0002-9569-9234UNSPECIFIED
Estalella, RobertUNSPECIFIEDorcid.org/0000-0001-7341-8641UNSPECIFIED
Girart, Josep M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fuente, AsuncionUNSPECIFIEDorcid.org/0000-0001-6317-6343UNSPECIFIED
Fontani, FrancescoUNSPECIFIEDorcid.org/0000-0003-0348-3418UNSPECIFIED
Commercon, BenoitUNSPECIFIEDorcid.org/0000-0003-2407-1025UNSPECIFIED
Busquet, GemmaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bontemps, SylvainUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Monge, AlvaroUNSPECIFIEDorcid.org/0000-0002-3078-9482UNSPECIFIED
Zapata, Luis A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zhang, QizhouUNSPECIFIEDorcid.org/0000-0003-2384-6589UNSPECIFIED
Hennebelle, PatrickUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
di Francesco, JamesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-440762
DOI: 10.1088/0004-637X/785/1/42
Journal or Publication Title: Astrophys. J.
Volume: 785
Number: 1
Date: 2014
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-4357
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
HIGH ANGULAR RESOLUTION; MOLECULAR CLOUD CORES; STAR-FORMING REGIONS; (PROTO)STAR IRAS 20126+4104; FAR-INFRARED OBSERVATIONS; RIMMED GLOBULE IC1396N; MILLIMETER CONTINUUM; CYGNUS-X; HIERARCHICAL FRAGMENTATION; SUBMILLIMETER OBSERVATIONSMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/44076

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