2021A&A...647A..91G


Query : 2021A&A...647A..91G

2021A&A...647A..91G - Astronomy and Astrophysics, volume 647A, 91-91 (2021/3-1)

3D dynamics of the Orion cloud complex. Discovery of coherent radial gas motions at the 100-pc scale.

GROSSSCHEDL J.E., ALVES J., MEINGAST S. and HERBST-KISS G.

Abstract (from CDS):

We present the first study of the three-dimensional (3D) dynamics of the gas in the entire southern Orion cloud complex. We used the parallaxes and proper motions of young stellar objects (YSOs) from Gaia DR2 as a proxy for gas distance and proper motion, and the gas radial velocities from archival CO data, to compute the space motions of the different star-forming clouds in the complex, including subregions in Orion A, Orion B, and two outlying cometary clouds. From the analysis of the clouds' orbits in space and time, we find that they were closest about 6Myr ago and are moving radially away from roughly the same region in space. This coherent 100-pc scale radial motion supports a scenario where the entire complex is reacting to a major feedback event, which we name the Orion-BB (big blast) event. This event, which we tentatively associate with the recently discovered Orion X stellar population, shaped the distribution and kinematics of the gas we observe today, although it is unlikely to have been the sole major feedback event in the region. We argue that the dynamics of most of the YSOs carry the memory of the feedback-driven star formation history in Orion and that the majority of the young stars in this complex are a product of large-scale triggering, which can raise the star formation rate by at least an order of magnitude, as for the head of Orion A (the Integral Shape Filament). Our results imply that a feedback, compression, and triggering process lies at the genesis of the Orion Nebula Cluster and NGC 2023/2024 in Orion B, thus confirming broadly the classical feedback-driven scenario proposed in Elmegreen & Lada (1977ApJ...214..725E). The space motions of the well-known young compact clusters, σ Orionis and NGC 1977, are consistent with this scenario. A momentum estimate suggests that the energy of a few to several supernovae is needed to power the coherent 3D gas motion we measure in this paper.

Abstract Copyright: © ESO 2021

Journal keyword(s): methods: data analysis - parallaxes - proper motions - ISM: kinematics and dynamics - stars: formation - radio lines: ISM

Simbad objects: 50

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Number of rows : 50
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Eri Bubble HI 03 52 -02.0           ~ 124 0
2 NGC 1909 RNe 05 02 -07.9           ~ 36 0
3 [CB88] 28 MoC 05 06 16.0 -03 56 29           ~ 22 0
4 LDN 1616 DNe 05 07 00 -03 21.1           ~ 34 0
5 NAME Orion X As* 05 14 -01.           ~ 12 0
6 * bet Ori s*b 05 14 32.27210 -08 12 05.8981 -0.56 0.10 0.13 0.13 0.15 B8Iae 764 0
7 NAME HH 240/241 DNe 05 19 48.9 -05 52 05           ~ 111 1
8 * psi01 Ori Be* 05 24 44.8273848312 +01 50 47.201915688 3.83 4.76 4.96 5.04 5.26 B1Vn 354 0
9 NAME 25 Ori Group OpC 05 24 47.5 +01 39 18           ~ 162 1
10 NAME Barnard's Loop HII 05 27.5 -03 58           ~ 125 1
11 NAME Orion D Cl* 05 28 -02.0           ~ 14 0
12 NAME HR 1833 Cluster OpC 05 28 44 +01 37.8           ~ 41 0
13 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 266 0
14 NAME f-Shaped Filament in Orion Cld 05 35.0 -05 30           ~ 114 0
15 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2337 0
16 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1171 2
17 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2301 1
18 NGC 1980 OpC 05 35 14.4 -05 55 26     2.5     ~ 112 0
19 NGC 1977 OpC 05 35 15.6 -04 49 08           ~ 234 0
20 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1406 1
21 M 42 HII 05 35 17 -05 23.4           ~ 4094 0
22 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 580 0
23 NAME Ori Complex Cld 05 35.3 -05 23           ~ 441 0
24 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 273 1
25 * c Ori Y*O 05 35 23.1646530684 -04 50 18.059784995 3.46 4.40 4.59 4.67 4.85 B1V+? 217 0
26 NGC 1981 OpC 05 35 23.5 -04 29 10     4.2     ~ 86 0
27 OMC 5 MoC 05 35.4 -05 55           ~ 28 0
28 OMC 2 MoC 05 35 27 -05 10.1           ~ 451 1
29 NAME OMC-2/3 reg 05 35 33.0 -05 00 32           ~ 93 0
30 OMC 4 MoC 05 36 06 -05 35.7           ~ 71 0
31 NAME Ori I As* 05 38 -02.8           ~ 616 0
32 NAME Ori A MoC 05 38 -07.1           ~ 3022 0
33 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 805 0
34 LDN 1641 MoC 05 39.0 -07 00           ~ 480 0
35 IC 434 HII 05 41 -02.5           ~ 89 1
36 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 635 1
37 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1382 0
38 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1156 1
39 LDN 1647 DNe 05 42.4 -09 58           ~ 35 0
40 LDN 1630 DNe 05 45.5 -00 59           ~ 382 0
41 M 78 RNe 05 46 45.8 +00 04 45   8.0       ~ 376 0
42 NGC 2071 RNe 05 47 10 +00 18.0           ~ 647 1
43 LDN 1617 DNe 05 51 46 +02 48.5           ~ 60 0
44 LDN 1622 DNe 05 54 28 +01 48.2           ~ 104 0
45 NAME Orion East Cld 05 55 +02.1           ~ 5 0
46 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1105 1
47 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14553 0
48 NAME Radcliffe Wave PoG ~ ~           ~ 46 0
49 NAME Ori Belt reg ~ ~           ~ 78 0
50 Ass Ori OB 1a As* ~ ~           ~ 230 0

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