2015A&A...581A..71F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST08:22:56

2015A&A...581A..71F - Astronomy and Astrophysics, volume 581A, 71-71 (2015/9-1)

Resolving the chemical substructure of Orion-KL.

FENG S., BEUTHER H., HENNING T., SEMENOV D., PALAU A. and MILLS E.A.C.

Abstract (from CDS):

The Kleinmann-Low nebula in Orion (Orion-KL) is the nearest example of a high-mass star-forming environment. Studying the resolved chemical substructures of this complex region provides important insight into the chemistry of high-mass star-forming regions (HMSFRs), as it relates to their evolutionary states. The goal of this work is to resolve the molecular line emission from individual substructures of Orion-KL at high spectral and spatial resolution and to infer the chemical properties of the associated gas. We present a line survey of Orion-KL obtained from combined Submillimeter Array (SMA) interferometric and IRAM 30m single-dish observations. Covering a 4GHz bandwidth in total, this survey contains over 160 emission lines from 20 species (25 isotopologues), including 11 complex organic molecules (COMs). Spectra are extracted from individual substructures and the intensity-integrated distribution map for each species is provided. We then estimate the rotation temperature for each substructure, along with their molecular column densities and abundances. For the first time, we complement 1.3mm interferometric data with single-dish observations of the Orion-KL region and study small-scale chemical variations in this region. (1) We resolve continuum substructures on ∼3'' angular scale. (2) We identify lines from the low-abundance COMs CH3COCH3 and CH3CH2OH, as well as tentatively detect CH3CHO and long carbon-chain molecules C6H and HC7N. (3) We find that while most COMs are segregated by type, peaking either towards the hotcore (e.g., nitrogen-bearing species) or the compact ridge (e.g., oxygen-bearing species like HCOOCH3 and CH3OCH3), the distributions of others do not follow this segregated structure (e.g., CH3CH2OH, CH3OH, CH3COCH3). (4) We find a second velocity component of HNCO, SO2, 34SO2, and SO lines, which may be associated with a strong shock event in the low-velocity outflow. (5) Temperatures and molecular abundances show large gradients between central condensations and the outflow regions, illustrating a transition between hot molecular core and shock-chemistry dominated regimes. Our observations of spatially resolved abundance variations in Orion-KL provide the nearest reference source for hot molecular core and outflow chemistry, which will be an important example for interpreting the chemistry of more distant HMSFRs.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: abundances - stars: massive - ISM: lines and bands - ISM: molecules - submillimeter: ISM

VizieR on-line data: <Available at CDS (J/A+A/581/A71): list.dat fits/*>

Errata: corrigendum vol.590, art. C1 (2016)

CDS comments: Sources SMMN not used in Simbad.

Simbad objects: 20

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Number of rows : 20

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 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1054 3
2 NAME Orion Peak 1 PoC 05 35 13.57 -05 22 03.8           ~ 31 0
3 MLLA 602 * 05 35 13.9700 -05 22 31.900           ~ 53 0
4 [FW2011] J053513.988-052244.887 mm 05 35 13.988 -05 22 44.89           ~ 5 0
5 [FDB2011] Cb2 mm 05 35 14.010 -05 22 37.24           ~ 2 0
6 [FDB2011] Cb1 mm 05 35 14.080 -05 22 36.73           ~ 3 0
7 [FDB2011] Cc mm 05 35 14.080 -05 22 27.50           ~ 2 0
8 V* V2254 Ori Or* 05 35 14.11296 -05 22 22.7316           B 286 2
9 [GD77] B IR 05 35 14.15 -05 22 37.4           ~ 30 0
10 [RLK73] IRc 20 IR 05 35 14.16 -05 22 29.8           ~ 12 0
11 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2001 1
12 [RLK73] IRc 6 IR 05 35 14.18 -05 22 26.7           ~ 36 0
13 NAME Ori N Y*O 05 35 14.35371 -05 22 32.8820           ~ 103 0
14 JCMTSE J053514.4-052232 Y*? 05 35 14.488 -05 22 32.10           ~ 46 0
15 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 572 1
16 NAME Orion Peak 2 PoC 05 35 15.74 -05 22 39.9           ~ 20 0
17 QSO B0607-157 QSO 06 09 40.9477650070 -15 42 40.649794982   18.47 18.0 19.90   ~ 289 1
18 NAME CBI ClG 09 56 39.6 -10 10 22           ~ 10 0
19 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1909 1
20 NAME Large Molecule Heimat MoC 17 47 20.4943 -28 22 11.656           ~ 111 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-08:22:56

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