2009AJ....137..367O


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET22:45:58

2009AJ....137..367O - Astron. J., 137, 367-382 (2009/January-0)

The three-dimensional dynamic structure of the inner Orion nebula.

O'DELL C.R., HENNEY W.J., ABEL N.P., FERLAND G.J. and ARTHUR S.J.

Abstract (from CDS):

The three-dimensional structure of the brightest part of the Orion Nebula is assessed in the light of published and newly established data. We find that the widely accepted model of a concave blister of ionized material needs to be altered in the southwest direction from the Trapezium, where we find that the Orion-S feature is a separate cloud of very optically thick molecules within the body of ionized gas, which is probably the location of the multiple embedded sources that produce the optical and molecular outflows that define the Orion-S star formation region. Evidence for this cloud comes from the presence of H2 CO lines in absorption in the radio continuum and discrepancies in the extinction derived from radio-optical and optical-only emission. We present an equilibrium Cloudy model of the Orion-S Cloud, which successfully reproduces many observed properties of this feature, including the presence of gas-phase H2 CO in absorption. We also report the discovery of an open-sided shell of [O III] surrounding the Trapezium stars, revealed through emission-line ratio images and the onset of radiation shadows beyond some proplyds. We show that the observed properties of the shell are consistent with it being a stationary structure, produced by shock interactions between the ambient nebular gas and the high-velocity wind from θ1 Ori C. We examine the implications of the recently published evidence for a large blueshifted velocity of θ1 Ori C with respect to the Orion molecular cloud, which could mean that this star has only recently begun to photoionize the Orion Nebula. We show that current observations of the nebula do not rule out such a possibility, so long as the ionization front has propagated into a pre-existing low-density region. In addition, a young age for the nebula would help explain the presence of nearby proplyds with a short mass-loss timescale to photoablation.

Abstract Copyright:

Journal keyword(s): H II regions - ISM: individual (Orion Nebula, NGC 1976) - stars: formation

Simbad objects: 48

goto Full paper

goto View the reference in ADS

Number of rows : 48

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* AE Aur Or* 05 16 18.1489437436 +34 18 44.347016027 5.48 6.18 5.96     O9.5V 529 1
2 [OW94] 145-353 ? 05 23 14.5 -05 23 53           ~ 1 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2021 1
4 HH 269 HH 05 35 09.1 -05 23 44           ~ 37 0
5 HH 530 HH 05 35 10.8 -05 24 20           ~ 16 0
6 HH 202 HH 05 35 11.5 -05 22 46           ~ 67 4
7 2MASS J05351172-0523518 Y*O 05 35 11.740 -05 23 51.63   16.412 16.291   15.064 M4.4e 32 2
8 HH 625 HH 05 35.2 -05 26           ~ 13 0
9 V* V1228 Ori Or* 05 35 12.2814452451 -05 23 48.023760022   15.361 14.238   11.906 K1 57 0
10 [OW94] 125-404 ? 05 35 12.5 -05 24 04           ~ 1 0
11 NAME Orion S reg 05 35 12.9 -05 24 10           ~ 122 0
12 [ZRK2004b] 132-413 Rad 05 35 13.2 -05 24 13           ~ 5 0
13 [EC2006] MM12 HII 05 35 13.41015 -05 24 11.1770           ~ 47 1
14 COUP 555 Y*O 05 35 13.550 -05 23 59.67           ~ 26 0
15 COUP 564 * 05 35 13.680 -05 23 45.40           ~ 13 0
16 ISOY J053513.81-052340.1 Y*O 05 35 13.7814 -05 23 39.990           ~ 28 0
17 [FRM2016] 144 Rad 05 35 13.88763 -05 23 57.1815           ~ 5 0
18 DOH 2 139-335 Y*O 05 35 13.9 -05 23 35           ~ 2 1
19 COUP 594 * 05 35 13.97231 -05 24 09.8193           ~ 9 0
20 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1025 2
21 Parenago 1823 Em* 05 35 14.0506648456 -05 23 38.471270173     15.078   12.238 K5 39 0
22 V* V2254 Ori Or* 05 35 14.11296 -05 22 22.7316           B 291 2
23 [SEM2016] 280 Rad 05 35 14.140 -05 23 56.75           ~ 9 0
24 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2032 1
25 [DRS2009] 1186 * 05 35 14.29 -05 23 53.1   15.140 15.632   15.695 ~ 10 0
26 MLLA 293 Y*O 05 35 14.3976 -05 23 50.914           ~ 26 0
27 [OW94] 146-351 ? 05 35 14.6 -05 23 51           ~ 1 0
28 [OW94] 148-347 ? 05 35 14.8 -05 23 47           ~ 1 0
29 * tet01 Ori A Ae* 05 35 15.8252169327 -05 23 14.332546552 5.87 6.75 6.73 6.42 6.21 B0V 460 1
30 V* V2279 Ori Or* 05 35 15.9483540546 -05 23 49.949661400 14.794 13.648 12.730   10.537 M0.5+M2 89 0
31 * tet01 Ori B Al* 05 35 16.112 -05 23 06.89 7.71 8.20 7.96     B1V 344 2
32 HH 518 HH 05 35 16.4 -05 23 42           ~ 8 4
33 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1285 1
34 HH 528 HH 05 35 16.5 -05 24 36           ~ 22 0
35 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1486 1
36 Parenago 1894 Y*O 05 35 16.97 -05 23 37.0 15.006 14.944 14.492   12.593 M2e 77 0
37 * tet01 Ori D Y*O 05 35 17.2574309230 -05 23 16.567215876 6.08 6.79 6.70 6.40 6.20 B1.5Vp 307 0
38 M 42 HII 05 35 17.3 -05 23 28           ~ 3756 0
39 HH 529 HH 05 35.3 -05 23           ~ 30 4
40 HH 203 HH 05 35 22.2 -05 24 58           ~ 68 4
41 HH 204 HH 05 35 22.6 -05 25 13           ~ 73 4
42 * iot Ori SB* 05 35 25.9819073 -05 54 35.643537 1.45 2.53 2.77     O9IIIvar 734 0
43 * mu. Col V* 05 45 59.8953630749 -32 18 23.164726112 3.84 4.90 5.18 5.30 5.57 O9.5V 462 0
44 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 868 1
45 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1494 0
46 NGC 7293 PN 22 29 38.5453078023 -20 50 13.746093105 11.894 13.158 13.524 13.689 13.898 DAO.5 905 0
47 NAME Big Arc in Orion Nebula reg ~ ~           ~ 3 0
48 NAME Dark Bay in OMC-1 PoC ~ ~           ~ 9 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2009AJ....137..367O and select 'bookmark this link' or equivalent in the popup menu


2020.11.30-22:45:58

© Université de Strasbourg/CNRS

    • Contact