2017A&A...604A..32P


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET16:17:38

2017A&A...604A..32P - Astronomy and Astrophysics, volume 604A, 32-32 (2017/8-1)

The complexity of Orion: an ALMA view. I. Data and first results.

PAGANI L., FAVRE C., GOLDSMITH P.F., BERGIN E.A., SNELL R. and MELNICK G.

Abstract (from CDS):

Context. We wish to improve our understanding of the Orion central star formation region (Orion-KL) and disentangle its complexity.
Aims. We collected data with ALMA during cycle 2 in 16GHz of total bandwidth spread between 215.1 and 252.0GHz with a typical sensitivity of 5mJy/beam (2.3mJy/beam from 233.4 to 234.4GHz) and a typical beam size of 1.7x1.0 (average position angle of 89°). We produced a continuum map and studied the emission lines in nine remarkable infrared spots in the region including the hot core and the compact ridge, plus the recently discovered ethylene glycol peak.
Methods. We present the data, and report the detection of several species not previously seen in Orion, including n- and i-propyl cyanide (C3H7CN), and the tentative detection of a number of other species including glycolaldehyde (CH2(OH)CHO). The first detections of gGg' ethylene glycol (gGg' (CH2OH)2) and of acetic acid (CH3COOH) in Orion are presented in a companion paper. We also report the possible detection of several vibrationally excited states of cyanoacetylene (HC3N), and of its 13C isotopologues. We were not able to detect the 16O18O line predicted by our detection of O2 with Herschel, due to blending with a nearby line of vibrationally excited ethyl cyanide. We do not confirm the tentative detection of hexatriynyl (C6H) and cyanohexatriyne (HC7N) reported previously, or of hydrogen peroxide (H2O2) emission.
Results. We report a complex velocity structure only partially revealed before. Components as extreme as -7 and +19km/s are detected inside the hot region. Thanks to different opacities of various velocity components, in some cases we can position these components along the line of sight. We propose that the systematically redshifted and blueshifted wings of several species observed in the northern part of the region are linked to the explosion that occurred ∼500 yr ago. The compact ridge, noticeably farther south displays extremely narrow lines (∼1km/s) revealing a quiescent region that has not been affected by this explosion. This probably indicates that the compact ridge is either over 10 000 au in front of or behind the rest of the region.
Conclusions. Many lines remain unidentified, and only a detailed modeling of all known species, including vibrational states of isotopologues combined with the detailed spatial analysis offered by ALMA enriched with zero-spacing data, will allow new species to be detected.

Abstract Copyright: © ESO, 2017

Journal keyword(s): ISM: clouds - ISM: structure - ISM: individual objects: Orion-KL (except planetary nebulae) - astrochemistry - molecular processes - molecular processes

VizieR on-line data: <Available at CDS (J/A+A/604/A32): table1.dat list.dat fits/*>

Simbad objects: 24

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Number of rows : 24

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 RAFGL 618 pA* 04 42 53.6245215366 +36 06 53.397219192   16.32   12.59   C-rich 944 0
2 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 991 2
3 [FDB2011] MF5 mm 05 35 14.12 -05 22 27.7           ~ 5 0
4 [FDB2011] MF4 mm 05 35 14.15 -05 22 29.3           ~ 3 0
5 [RLK73] IRc 20 IR 05 35 14.16 -05 22 29.8           ~ 12 0
6 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1945 1
7 [RLK73] IRc 6 IR 05 35 14.18 -05 22 26.7           ~ 36 0
8 [FDB2011] MF12 mm 05 35 14.18 -05 22 34.6           ~ 4 0
9 [GD77] A IR 05 35 14.19 -05 22 34.0           ~ 58 0
10 [FW2011] J053514.278-052230.647 IR 05 35 14.278 -05 22 30.65           ~ 68 0
11 NAME Ori N Y*O 05 35 14.35371 -05 22 32.8820           ~ 100 0
12 [RLK73] IRc 21 IR 05 35 14.41 -05 22 27.9           ~ 6 0
13 [FDB2011] MF2 mm 05 35 14.44 -05 22 34.4           ~ 6 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           ~ 559 1
16 [FW2011] J053514.556-052227.128 mm 05 35 14.556 -05 22 27.13           ~ 3 0
17 [FDB2011] MF10 mm 05 35 14.68 -05 22 28.9           ~ 3 0
18 M 42 HII 05 35 17.3 -05 23 28           ~ 3658 0
19 NAME Ori A MoC 05 38 -07.1           ~ 2616 0
20 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1131 0
21 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 812 1
22 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2938 0
23 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1000 1
24 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1857 1

    Equat.    Gal    SGal    Ecl

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2019.11.14-16:17:38

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