2011ApJ...742...64F


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.28CET10:43:50

2011ApJ...742...64F - Astrophys. J., 742, 64 (2011/December-1)

A high spatial resolution study of the λ = 3 mm continuum of Orion-KL.

FRIEDEL D.N. and WIDICUS WEAVER S.L.

Abstract (from CDS):

Recent interferometric observations have called into question the traditional view of the Orion-KL region, which displays one of the most well-defined cases of chemical differentiation in a star-forming region. Previous lower-resolution images of Orion-KL show emission signatures for oxygen-bearing organic molecules toward the Orion Compact Ridge and emission for nitrogen-bearing organic molecules toward the Orion Hot Core. However, more recent observations at higher spatial resolution indicate that the bulk of the molecular emission arises from many smaller, compact clumps that are spatially distinct from the traditional Hot Core and Compact Ridge sources. It is this type of observational information that is critical for guiding astrochemical models, as the spatial distribution of molecules and their relation to energetic sources will govern the chemical mechanisms at play in star-forming regions. We have conducted millimeter-imaging studies of Orion-KL with various beam sizes using the Combined Array for Research in Millimeter-Wave Astronomy in order to investigate the continuum structure. These λ = 3 mm observations have synthesized beam sizes of ∼0".5-5".0. These observations reveal the complex continuum structure of this region, which stands in sharp contrast to the previous structural models assumed for Orion-KL based on lower spatial resolution images. The new results indicate that the spatial scaling previously used in determination of molecular abundances for this region are in need of complete revision. Here we present the results of the continuum observations, discuss the sizes and structures of the detected sources, and suggest an observational strategy for determining the proper spatial scaling to accurately determine molecular abundances in the Orion-KL region.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: individual: Orion-KL - radio continuum: ISM

Nomenclature: Fig. 3, Tables 1-2 col(1): [FW2011] CNN (Nos C1-C34) = Table 1: [FW2011] JHHMMSS.sss+DDMMSS.sss N=30, [FW2011] JHHMMSS.ss+DDMMSS.ss N=1.

Simbad objects: 52

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Number of rows : 52

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 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1081 3
2 NAME OMC1 Ridge reg 05 35 13.4 -05 23 07           ~ 123 0
3 Parenago 1820 Y*O 05 35 13.5186502134 -05 22 19.550872932   13.1 16.160   13.254 M1.2 45 0
4 COUP 572 * 05 35 13.77462 -05 22 17.3912           ~ 16 0
5 [FW2011] J053513.782-052217.235 mm 05 35 13.782 -05 22 17.24           ~ 1 0
6 [FW2011] J053513.796-052202.711 mm 05 35 13.796 -05 22 02.71           ~ 1 0
7 V* V1496 Ori Or* 05 35 13.8001039312 -05 22 07.024932180   16.184 14.987   12.289 K2e 50 0
8 COUP 590 * 05 35 13.9700 -05 22 31.900           ~ 55 0
9 [FW2011] J053513.981-052242.611 Mas 05 35 13.981 -05 22 42.61           ~ 2 0
10 [EC2006] MM23 mm 05 35 13.988 -05 22 44.89           ~ 6 0
11 COUP 600 * 05 35 14.07 -05 22 36.6     15.906   12.799 M3 50 0
12 [FW2011] C32 mm 05 35 14.0700 -05 22 36.581           ~ 3 0
13 [FW2011] J053514.096-052226.734 IR 05 35 14.096 -05 22 26.73           ~ 6 0
14 V* V2254 Ori Or* 05 35 14.11296 -05 22 22.7316           B 293 2
15 [FW2011] J053514.129-052213.228 mm 05 35 14.129 -05 22 13.23           ~ 1 0
16 [GD77] B IR 05 35 14.15 -05 22 37.4           ~ 30 0
17 [FW2011] J053514.155-052227.193 mm 05 35 14.155 -05 22 27.19           ~ 1 0
18 [RLK73] IRc 20 IR 05 35 14.16 -05 22 29.8           ~ 12 0
19 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2040 1
20 [RLK73] IRc 6 IR 05 35 14.18 -05 22 26.7           ~ 36 0
21 [GD77] A IR 05 35 14.19 -05 22 34.0           ~ 59 0
22 [FW2011] J053514.20-052237.15 Mas 05 35 14.20 -05 22 37.1           ~ 4 0
23 [FW2011] J053514.253-052227.820 IR 05 35 14.253 -05 22 27.82           ~ 6 0
24 MLLA 610 IR 05 35 14.278 -05 22 30.65           ~ 71 0
25 [FW2011] J053514.309-052241.839 mm 05 35 14.309 -05 22 41.84           ~ 1 0
26 COUP 621 Y*O 05 35 14.35371 -05 22 32.8820           ~ 105 0
27 COUP 622 * 05 35 14.3700 -05 22 36.100     23.30     ~ 24 0
28 [FW2011] J053514.431-052233.457 IR 05 35 14.431 -05 22 33.46           ~ 13 0
29 [FW2011] C34 mm 05 35 14.4640 -05 22 35.350           ~ 3 0
30 JCMTSE J053514.4-052232 Y*? 05 35 14.488 -05 22 32.10           ~ 47 0
31 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 176 0
32 [RLK73] IRc 2a Y*O 05 35 14.511 -05 22 30.40           ~ 112 0
33 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 587 1
34 [FW2011] J053514.519-052244.609 IR 05 35 14.519 -05 22 44.61           ~ 4 0
35 [FW2011] J053514.556-052227.128 mm 05 35 14.556 -05 22 27.13           ~ 3 0
36 [FW2011] J053514.579-052230.679 Y*O 05 35 14.579 -05 22 30.68           ~ 3 0
37 [FW2011] C33 mm 05 35 14.6130 -05 22 29.688           ~ 2 0
38 [EC2006] MM24 mm 05 35 14.614 -05 22 28.70           ~ 5 0
39 MLLA 572A * 05 35 14.656 -05 22 38.36           ~ 11 0
40 NAME ORBS Y*O 05 35 14.665 -05 22 11.06           ~ 21 1
41 [SBE98] CB4 ** 05 35 14.70 -05 22 29.6           ~ 6 1
42 [FW2011] J053514.797-052230.557 Mas 05 35 14.797 -05 22 30.56           ~ 2 0
43 [FW2011] J053514.835-052214.660 mm 05 35 14.835 -05 22 14.66           ~ 2 0
44 [FW2011] J053514.850-052244.020 IR 05 35 14.850 -05 22 44.02           ~ 2 0
45 V* V1330 Ori BY* 05 35 14.9157450029 -05 22 39.209342428   15.040 13.940   11.632 K4 69 0
46 [FW2011] J053514.996-052239.411 Y*O 05 35 14.996 -05 22 39.41           ~ 3 1
47 [FW2011] J053515.047-052202.840 mm 05 35 15.047 -05 22 02.84           ~ 3 0
48 [FW2011] J053515.156-052217.173 mm 05 35 15.156 -05 22 17.17           ~ 1 0
49 [FW2011] J053515.179-052229.431 mm 05 35 15.179 -05 22 29.43           ~ 1 0
50 [FW2011] J053515.310-052204.680 mm 05 35 15.310 -05 22 04.68           ~ 3 0
51 QSO B0539-057 QSO 05 41 38.08338 -05 41 49.4284     20.4 20.70   ~ 217 2
52 QSO B0605-0834 BLL 06 07 59.69923743 -08 34 49.9781718     18.5 17.70   ~ 405 1

    Equat.    Gal    SGal    Ecl

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2021.01.28-10:43:50

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