SIMBAD references

2018ApJ...855...24P - Astrophys. J., 855, 24-24 (2018/March-1)

Thermal Jeans fragmentation within ∼1000 au in OMC-1S.

PALAU A., ZAPATA L.A., ROMAN-ZUNIGA C.G., SANCHEZ-MONGE A., ESTALELLA R., BUSQUET G., GIRART J.M., FUENTE A. and COMMERCON B.

Abstract (from CDS):

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 ∼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 ∼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.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): radio continuum: ISM - stars: formation

Nomenclature: Table 1: [PZR2018] AANa N=31 among (Nos N1a-N1c to N3, EF1-EF7, WF1-WF3, SF1 to SF6a-SF6b). Table 2: [PZR2018] AANaa N=17 among (Nos N1b to N3, EF1-EF6, WF2b to WF3, SF2aa to SF6bb). Table 3: [PZR2018] AAN (Nos N1-N3, EF1-EF7, WF1-WF3, SF1-SF6).

Status in Simbad:  being processed

Simbad objects: 26

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2019.11.19-20:31:29

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