2015A&A...579A.130B


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.12CET00:39:20

2015A&A...579A.130B - Astronomy and Astrophysics, volume 579A, 130-130 (2015/7-1)

The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar outflow.

BALLY J., GINSBURG A., SILVIA D. and YOUNGBLOOD A.

Abstract (from CDS):

Adaptive optics (AO) images are used to test the hypothesis that the explosive BN/KL outflow from the Orion OMC1 cloud core was powered by the dynamical decay of a non-hierarchical system of massive stars. Narrow-band H2, [FeII], and broad-band Ks obtained with the Gemini South multi-conjugate AO system GeMS and near-IR imager GSAOI are presented. The images reach resolutions of 0.08 to 0.10", close to the 0.07" diffraction limit of the 8-m telescope at 2.12µm. Comparison with previous AO-assisted observations of sub-fields and other ground-based observations enable measurements of proper motions and the investigation of morphological changes in H2 and [FeII] features with unprecedented precision. The images are compared with numerical simulations of compact, high-density clumps moving ∼103 times their own diameter through a lower density medium at Mach 103. Several sub-arcsecond H2 features and many [FeII] ``fingertips'' on the projected outskirts of the flow show proper motions of ∼300km/s. High-velocity, sub-arcsecond H2 knots (``bullets'') are seen as far as 140" from their suspected ejection site. If these knots propagated through the dense Orion A cloud, their survival sets a lower bound on their densities of order 107cm–3, consistent with an origin within a few au of a massive star and accelerated by a final multi-body dynamic encounter that ejected the BN object and radio source I from OMC1 about 500yr ago. Over 120 high-velocity bow-shocks propagating in nearly all directions from the OMC1 cloud core provide evidence for an explosive origin for the BN/KL outflow triggered by the dynamic decay of a non-hierarchical system of massive stars. Such events may be linked to the origin of runaway, massive stars.

Abstract Copyright:

Journal keyword(s): ISM: jets and outflows - ISM: clouds - stars: formation

VizieR on-line data: <Available at CDS (J/A+A/579/A130): list.dat fits/*>

Simbad objects: 29

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Number of rows : 29

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 HD 34078 Or* 05 16 18.1489437436 +34 18 44.347016027 5.48 6.18 5.96     O9.5V 514 1
2 HH 201 HH 05 35 11.5 -05 21 54           ~ 37 2
3 HH 205 HH 05 35 11.703 -05 20 24.69           ~ 32 0
4 HH 207 HH 05 35 12.7 -05 20 49           ~ 29 0
5 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 991 2
6 V* V2254 Ori Or* 05 35 14.113 -05 22 22.73           B 277 2
7 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1944 1
8 [FW2011] J053514.431-052233.457 IR 05 35 14.431 -05 22 33.46           ~ 13 0
9 JCMTSE J053514.4-052232 Y*? 05 35 14.488 -05 22 32.10           ~ 46 0
10 V* V2270 Ori Or* 05 35 15.4016092493 -05 21 13.957638452     17.795   14.313 M3.5e 28 0
11 [LB2000] 154-041 * 05 35 15.45928 -05 20 40.6911           ~ 49 0
12 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1432 1
13 M 42 HII 05 35 17.3 -05 23 28           ~ 3658 0
14 NGC 1980 OpC 05 35 24 -05 54.9     2.5     ~ 81 0
15 HH 309 HH 05 36 03.1 -05 49 47           ~ 6 0
16 NAME Ori A MoC 05 38 -07.1           ~ 2614 0
17 ZOAG G184.95-00.85 SFR 05 53 42.717 +24 14 54.01           ~ 39 0
18 2MASS J05534356+2414447 Y*O 05 53 43.5659892117 +24 14 44.668205121           G9-K2 40 0
19 IRAS 05506+2414 mul 05 53 44.8 +24 14 45           ~ 42 0
20 * alf Car * 06 23 57.10988 -52 41 44.3810 -0.49 -0.59 -0.74 -0.96 -1.13 A9II 413 0
21 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 448 0
22 [DJW84] W49 G HII 19 10 13.57 +09 06 12.9           ~ 22 0
23 W 49 SFR 19 10 20 +09 07.7           ~ 502 1
24 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 805 0
25 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 929 0
26 NGC 7129 OpC 21 42 56 +66 06.2     11.5     ~ 230 0
27 GGD 34 HH 21 43 30.4 +66 03 43           ~ 32 0
28 HH 601 HH ~ ~           ~ 2 0
29 HH 603 HH ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2019.11.12-00:39:20

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