2013ApJ...763...57T


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET11:38:14

2013ApJ...763...57T - Astrophys. J., 763, 57 (2013/January-3)

Hierarchical fragmentation of the Orion molecular filaments.

TAKAHASHI S., HO P.T.P., TEIXEIRA P.S., ZAPATA L.A. and SU Y.-N.

Abstract (from CDS):

We present a high angular resolution map of the 850 µm continuum emission of the Orion Molecular Cloud-3 (OMC 3) obtained with the Submillimeter Array (SMA); the map is a mosaic of 85 pointings covering an approximate area of 6.'5x2.'0 (0.88x0.27 pc). We detect 12 spatially resolved continuum sources, each with an H2 mass between 0.3-5.7 Mand a projected source size between 1400-8200 AU. All the detected sources are on the filamentary main ridge (nH2 ≥ 106/cm3), and analysis based on the Jeans theorem suggests that they are most likely gravitationally unstable. Comparison of multi-wavelength data sets indicates that of the continuum sources, 6/12 (50%) are associated with molecular outflows, 8/12 (67%) are associated with infrared sources, and 3/12 (25%) are associated with ionized jets. The evolutionary status of these sources ranges from prestellar cores to protostar phase, confirming that OMC-3 is an active region with ongoing embedded star formation. We detect quasi-periodical separations between the OMC-3 sources of ~17''/0.035 pc. This spatial distribution is part of a large hierarchical structure that also includes fragmentation scales of giant molecular cloud (~35 pc), large-scale clumps (~1.3 pc), and small-scale clumps (~0.3 pc), suggesting that hierarchical fragmentation operates within the Orion A molecular cloud. The fragmentation spacings are roughly consistent with the thermal fragmentation length in large-scale clumps, while for small-scale cores it is smaller than the local fragmentation length. These smaller spacings observed with the SMA can be explained by either a helical magnetic field, cloud rotation, or/and global filament collapse. Finally, possible evidence for sequential fragmentation is suggested in the northern part of the OMC-3 filament.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: individual (OMC-3, Orion A) - ISM: structure - stars: formation - stars: protostars

Nomenclature: Table 3: [THT2013] OMC3-SMM NN (Nos 1-12)

Simbad objects: 26

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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 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3360 0
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1924 1
3 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 997 2
4 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1962 1
5 NAME OMC 1S PoC 05 35 14.5 -05 25 49           ~ 68 1
6 V* V2282 Ori Or* 05 35 16.16 -05 00 02.6           ~ 17 0
7 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1441 1
8 [TSO2008] 9 mm 05 35 18.030 -05 00 17.77           ~ 17 0
9 [TUK93] 3 Y*O 05 35 18.32712 -05 00 32.9400           ~ 54 2
10 HOPS 91 Y*O 05 35 18.98 -05 00 51.6           ~ 28 0
11 2MASS J05351997-0501024 Y*O 05 35 19.97 -05 01 02.5           ~ 28 0
12 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 214 1
13 [TSO2008] 13 Y*O 05 35 22.4451 -05 01 14.123           ~ 37 1
14 [TSO2008] 14 mm 05 35 23.420 -05 01 30.35           ~ 56 0
15 [MGM2012] 2433 Y*O 05 35 23.500 -05 01 29.58           ~ 7 0
16 2MASS J05352363-0501402 Y*O 05 35 23.63 -05 01 40.3           ~ 11 0
17 [THT2013] OMC3-SMM 12 smm 05 35 25.440 -05 03 53.22           ~ 1 0
18 IRAS 05329-0505 Y*O 05 35 26.746 -05 03 55.08           ~ 69 0
19 OMC 2 MoC 05 35 27 -05 10.1           ~ 375 1
20 TKK 870 Y*O 05 35 28.19 -05 03 41.2           ~ 34 0
21 NAME Ori A MoC 05 38 -07.1           ~ 2632 0
22 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1139 0
23 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1060 1
24 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 827 1
25 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5267 1
26 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2658 2

    Equat.    Gal    SGal    Ecl

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2020.01.28-11:38:14

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