2018ApJ...855...24P


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET09:04:14

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

goto Full paper

goto View the reference in ADS

Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SSTc2d J032536.4+304522 Y*O 03 25 36.49 +30 45 22.2           ~ 184 1
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1011 0
3 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3335 0
4 QSO B0521-365 BLL 05 22 57.9839686440 -36 27 30.847737786   15.26 14.62 14.48   ~ 684 2
5 NAME f-Shaped Filament in Orion Cld 05 35.0 -05 30           ~ 57 0
6 [ZRK2004b] 132-413 Rad 05 35 13.2 -05 24 13           ~ 5 0
7 [EC2006] MM12 HII 05 35 13.41015 -05 24 11.1770           ~ 46 1
8 2MASS J05351356-0523552 pr* 05 35 13.56 -05 23 55.3           ~ 30 0
9 [NW2007] OrionAN-0535136-52409 Y*? 05 35 13.57 -05 24 08.2           ~ 24 1
10 CXOONC J053513.5-052400 Y*O 05 35 13.6 -05 23 59           ~ 25 0
11 [ZRK2004b] 136-355 Rad 05 35 13.6 -05 23 55           ~ 2 0
12 COUP 564 * 05 35 13.680 -05 23 45.29           ~ 12 0
13 [ZRK2004b] 139-357 Rad 05 35 13.88763 -05 23 57.1815           ~ 4 0
14 [EC2006] MM14 Y*O 05 35 13.93039 -05 24 09.4197           ~ 12 0
15 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 991 2
16 [ZRK2004] 13 Rad 05 35 14.135 -05 23 56.69           ~ 8 0
17 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1948 1
18 [ZRK2004b] 144-351 Rad 05 35 14.391 -05 23 50.81           ~ 4 0
19 NAME OMC 1S PoC 05 35 14.5 -05 25 49           ~ 67 1
20 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1436 1
21 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 693 0
22 NAME Ori A MoC 05 38 -07.1           ~ 2619 0
23 QSO B0539-057 QSO 05 41 38.08338 -05 41 49.4284     20.4 20.70   ~ 196 2
24 QSO B0748+126 QSO 07 50 52.04573519 +12 31 04.8281766   17.67 17.28 17.16   ~ 267 1
25 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3626 1
26 NAME Upper Sco Association As* 16 12 -23.4           ~ 965 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2018ApJ...855...24P and select 'bookmark this link' or equivalent in the popup menu


2019.12.12-09:04:14

© Université de Strasbourg/CNRS

    • Contact