2002ApJ...566..910T


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.24CET13:02:03

2002ApJ...566..910T - Astrophys. J., 566, 910-924 (2002/February-3)

[Fe II] 1.257 µm and He I 1.083 µm emission in the central region of the Orion nebula: H II region, HH flows, jets, and proplyds.

TAKAMI M., USUDA T., SUGAI H., SUTO H., PYO T.-S., TAKEYAMA N., AOKI T., MIZUTANI K. and TANAKA M.

Abstract (from CDS):

The [Fe II] 1.257 µm and He I 1.083 µm emission lines were observed in the central 6'x8' region of the Orion Nebula, and their excitation in the photoionized H II region, HH flows, jets, and proplyds is investigated. Observations were carried out using the imaging Fabry-Perot spectrometer MUSE at the National Astronomical Observatory of Japan 1.5 m infrared telescope, which provides a 4'x4' field of view and a spectral resolution λ/δλ of ∼2000 at the observed wavelengths. The [Fe II] images exhibit (1) filamentary structures and diffuse emission, which presumably arise from ionization fronts of the photoionized H II region, and (2) a number of knots, some of which are newly identified. Centroidal velocities in most of the knots are negative relative to those in the ionization fronts by up to -60 km.s–1, and observed line profiles in the bright knots exhibit blueshifted wings, agreeing with bow shock models. The He I 1.083 µm emission in the observed region is dominated by the photoionized H II region, and its distribution reflects the complicated nature of the excitation. The He I images also contain blueshifted emission from several HH flows and jets and redshifted emission associated with proplyds. Our results for the shocks suggest that the [Fe II] 1.257 µm and He I 1.083 µm emission reflects the ionization of the preshock gas: the [Fe II] 1.257 µm emission is prominent in shocks propagating in molecular/atomic gas, while the He I 1.083 µm is prominent in shocks in the photoionized H II region. Different line excitation in these shocks can be explained by the following physical properties and processes: (1) difference of the excitation energies from the ground state (1 and 20 eV for the [Fe II] and He I lines, respectively), (2) resonance scattering and collisional excitation from the metastable state, enhancing the He I 1.083 µm line in shocks in the photoionized H II region, (3) a large photoionization cross section of Fe+, causing the absence of the [Fe II] emission in the same shocks, and possibly (4) charge exchange reactions of Fe, which could enhance the [Fe II] emission in neutral gas.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - Infrared: ISM - ISM: individual (Orion Nebula) - Stars: Formation

Nomenclature: Table 4, Text: [OW94] SSs-SSs N=29 added.

Simbad objects: 63

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Number of rows : 63

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 HH 269 HH 05 35 09.1 -05 23 44           ~ 37 0
2 [OW94] 107-315 * 05 35 10.7 -05 23 15           ~ 1 0
3 [OW94] 107-129 * 05 35 10.7 -05 21 29           ~ 1 0
4 [OW94] 114-124 * 05 35 11.4 -05 21 24           ~ 1 0
5 HH 202 HH 05 35 11.5 -05 22 46           ~ 65 4
6 HH 201 HH 05 35 11.5 -05 21 54           ~ 38 2
7 [LB2000] HH 117-114 HH 05 35 11.7 -05 21 14           ~ 2 0
8 HH 205 HH 05 35 11.703 -05 20 24.69           ~ 32 0
9 2MASS J05351171-0521128 * 05 35 11.715 -05 21 12.81           ~ 2 0
10 HH 206 HH 05 35 12.5 -05 20 38           ~ 22 0
11 [OW94] 126-146 * 05 35 12.6 -05 21 46           ~ 1 0
12 [OW94] 127-146 * 05 35 12.7 -05 21 46           ~ 1 0
13 HH 207 HH 05 35 12.7 -05 20 49           ~ 29 0
14 HH 208NW * 05 35 12.8 -05 22 15           ~ 2 0
15 [OW94] 127-147 * 05 35 12.8 -05 21 47           ~ 3 0
16 CXOONC J053512.9-052351 * 05 35 12.884 -05 23 51.41           ~ 5 0
17 [OW94] 130-147 * 05 35 13.0 -05 21 47           ~ 1 0
18 [OW94] 130-119 HH 05 35 13.0 -05 21 19           ~ 2 0
19 HH 206E HH 05 35 13.11 -05 20 38.8           ~ 3 0
20 [OW94] 133-338 * 05 35 13.3 -05 23 38           ~ 1 0
21 [OW94] 133-054 * 05 35 13.3 -05 20 54           ~ 1 0
22 HH 516 HH 05 35 13.7 -05 25 08           ~ 6 1
23 HH 208A HH 05 35 13.8 -05 22 22           ~ 22 0
24 V* V1496 Ori FU* 05 35 13.8001039312 -05 22 07.024932180   16.184 14.987   12.289 K2e-m4 48 0
25 [OW94] 139-350 * 05 35 13.89959 -05 23 50.0818           ~ 3 0
26 HH 209 HH 05 35 13.9 -05 21 47           ~ 20 0
27 MAX 52 Y*O 05 35 13.92733 -05 23 20.1123           ~ 19 0
28 [FRM2016] 166 Y*O 05 35 14.12 -05 23 01.4         14.934 ~ 29 0
29 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1968 1
30 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 565 1
31 2MASS J05351493-0523289 Y*O 05 35 14.9302332589 -05 23 29.019587855   12.3     14.335 ~ 32 0
32 [LB2000] 154-041 * 05 35 15.45928 -05 20 40.6911           ~ 50 0
33 2MASS J05351551-0523373 Y*O 05 35 15.5090 -05 23 37.180         13.821 ~ 47 1
34 Parenago 1866 Y*O 05 35 15.72550 -05 23 22.4347   16.0 14.5   12.446 ~ 47 1
35 * tet01 Ori A Ae* 05 35 15.8252169327 -05 23 14.332546552 5.87 6.75 6.73 6.42 6.21 B0V 457 1
36 Parenago 1867 Y*O 05 35 15.83370 -05 23 22.4207     13.645   12.102 Ke 75 1
37 TCC 47 Y*O 05 35 15.85 -05 23 25.5           ~ 47 0
38 [FRM2016] 261 Y*O 05 35 15.87 -05 23 37.6         15.212 ~ 33 0
39 V* V2279 Ori Or* 05 35 15.9338 -05 23 50.056 14.794 13.648 12.730   10.537 M0.5+M2 84 0
40 V* AC Ori Or* 05 35 16.0396400 -05 23 53.063091     14.875   12.337 F5e 57 1
41 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1265 1
42 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1445 1
43 [BSD98] 17 Y*O 05 35 16.89020 -05 23 38.0653           ~ 19 0
44 Parenago 1894 Y*O 05 35 16.97 -05 23 37.0 15.006 14.944 14.492   12.593 M2e 75 0
45 V* V2299 Ori Or* 05 35 17.06 -05 23 34.2 14.962 14.224 13.322   11.118 K1 68 0
46 [OW94] 172-327 * 05 35 17.22106 -05 23 26.5428           ~ 7 0
47 * 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 304 0
48 M 42 HII 05 35 17.3 -05 23 28           ~ 3684 0
49 [ZRK2004] 176-325 Y*O 05 35 17.56 -05 23 24.8   12.3       ~ 41 0
50 HH 529 HH 05 35.3 -05 23           ~ 30 4
51 V* AF Ori Or* 05 35 18.6662798791 -05 23 13.945021737         12.526 K2-K5e 47 0
52 [OW94] 222-504 * 05 35 22.2 -05 25 04           ~ 1 0
53 [OW94] 222-503 * 05 35 22.2 -05 25 03           ~ 1 0
54 HH 203 HH 05 35 22.2 -05 24 58           ~ 67 4
55 HH 204 HH 05 35 22.6 -05 25 13           ~ 72 4
56 2MASS J05352264-0525188 * 05 35 22.646 -05 25 18.85           ~ 2 0
57 2MASS J05352265-0525175 ISM 05 35 22.655 -05 25 17.60         15.439 ~ 7 1
58 * tet02 Ori A SB* 05 35 22.9022511214 -05 24 57.817182421 5.37 6.30 6.39 6.30 6.35 O9.5IVp 490 0
59 V* V2423 Ori Or* 05 35 24.4382267468 -05 24 39.864026227   15.834 15.162   12.583 M0e 56 1
60 2MASS J05352581-0524149 * 05 35 25.818 -05 24 14.90           ~ 3 0
61 [OW94] 259-416 * 05 35 25.88499 -05 24 15.8792           ~ 2 0
62 HD 38858 PM* 05 48 34.9401453172 -04 05 40.719529406 6.71 6.61 5.97     G2V 246 1
63 HH 269W HH ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.02.24-13:02:03

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