Universität zu Köln

Palau, Aina ORCID: 0000-0002-9569-9234, Zapata, Luis A., Roman-Zuniga, Carlos G., Sanchez-Monge, Alvaro, Estalella, Robert ORCID: 0000-0001-7341-8641, Busquet, Gemma, Girart, Josep M., Fuente, Asuncion ORCID: 0000-0001-6317-6343 and Commercon, Benoit (2018). Thermal Jeans Fragmentation within similar to 1000 au in OMC-1S. Astrophys. J., 851 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We present subarcsecond 1.3 mm continuum ALMA observations toward the Orion Molecular Cloud 1 South (OMC-1S) region, down to a spatial resolution of 74 au, which reveal a total of 31 continuum sources. We also present subarcsecond 7 mm continuum VLA observations of the same region, which allow further study of fragmentation down to a spatial resolution of 40 au. By applying a method of mean surface density of companions we find a characteristic spatial scale at similar to 560 au, and we use this spatial scale to define the boundary of 19 cores in OMC-1S as groupings of millimeter sources. We find an additional characteristic spatial scale at similar to 2800 au, which is the typical scale of the filaments in OMC-1S, suggesting a two-level fragmentation process. We measured the fragmentation level within each core and find a higher fragmentation toward the southern filament. In addition, the cores of the southern filament are also the densest cores (within 1100 au) in OMC-1S. This is fully consistent with previous studies of fragmentation at spatial scales one order of magnitude larger, and suggests that fragmentation down to 40 au seems to be governed by thermal Jeans processes in OMC-1S.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Palau, Aina UNSPECIFIED orcid.org/0000-0002-9569-9234 UNSPECIFIED Zapata, Luis A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roman-Zuniga, Carlos G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Monge, Alvaro UNSPECIFIED UNSPECIFIED UNSPECIFIED Estalella, Robert UNSPECIFIED orcid.org/0000-0001-7341-8641 UNSPECIFIED Busquet, Gemma UNSPECIFIED UNSPECIFIED UNSPECIFIED Girart, Josep M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fuente, Asuncion UNSPECIFIED orcid.org/0000-0001-6317-6343 UNSPECIFIED Commercon, Benoit UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-194827
DOI:	10.3847/1538-4357/aaad03
Journal or Publication Title:	Astrophys. J.
Volume:	851
Number:	1
Date:	2018
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INITIAL MASS FUNCTION; STAR-FORMING REGIONS; NEAR-INFRARED SURVEY; TURBULENT FRAGMENTATION; YOUNG STARS; DENSE CORES; ORION; SOUTH; MULTIPLICITY; OUTFLOW Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19482