2015A&A...582A..64L


Query : 2015A&A...582A..64L

2015A&A...582A..64L - Astronomy and Astrophysics, volume 582A, 64-64 (2015/10-1)

Tentative detection of ethylene glycol toward W51/e2 and G34.3+0.2.

LYKKE J.M., FAVRE C., BERGIN E.A. and JORGENSEN J.K.

Abstract (from CDS):

With only a few low- and high-mass star-formation regions studied in detail so far, it is unclear what role the enviroment plays in complex molecule formation. In this light, a comparison of relative abundances of related species between sources might be useful for explaining any observed differences. We seek to measure the relative abundance between three important complex organic molecules, ethylene glycol ((CH2OH)2), glycolaldehyde (CH2OHCHO) and methyl formate (HCOOCH3), toward high-mass protostars and thereby provide additional constraints on their formation pathways. We use IRAM 30m single-dish observations of the three species toward two high-mass star-forming regions - W51/e2 and G34.3+0.2 - and report a tentative detection of (CH2OH)2 toward both sources. Assuming that (CH2OH)2, CH2OHCHO, and HCOOCH3 spatially coexist, relative abundance ratios, HCOOCH3/(CH2OH)2, of 31 and 35 are derived for G34.3+0.2 and W51/e2, respectively. CH2OHCHO is not detected, but the data provide lower limits to the HCOOCH3/CH2OHCHO abundance ratios of ≥193 for G34.3+0.2 and ≥550 for W51/e2. A comparison of these results to measurements from various sources in the literature indicates that the source luminosities may be correlated with the HCOOCH3/(CH2OH)2 and HCOOCH3/CH2OHCHO ratios. This apparent correlation may be a consequence of the relative time scales each source spend at different temperature ranges in their evolution. Furthermore, we obtain lower limits to the ratio of (CH2OH)2/CH2OHCHO for G34.3+0.2 (≥6) and W51/e2 (≥16). This result confirms that a high (CH2OH)2/CH2OHCHO abundance ratio is not a specific property of comets, as previously speculated.

Abstract Copyright:

Journal keyword(s): ISM: molecules - ISM: abundances - ISM: individual objects: W51/e2 - methods: observational - astrochemistry - ISM: individual objects: G34.3+0.2

VizieR on-line data: <Available at CDS (J/A+A/582/A64): list.dat sp/*>

Simbad objects: 21

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Number of rows : 21
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 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 420 3
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 638 1
3 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 473 0
4 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1278 1
5 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 573 0
6 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2096 1
7 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1112 1
8 GCM -0.11 -0.08 MoC 17 45 39 -29 04.1           ~ 15 0
9 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12380 0
10 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3708 3
11 GCM -0.02 -0.07 MoC 17 45 50.4 -28 59 06           ~ 154 0
12 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 571 1
13 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2032 1
14 NAME Large Molecule Heimat MoC 17 47 20.4943 -28 22 11.656           ~ 115 0
15 GCM +0.693 -0.027 MoC 17 47 21.9 -28 21 27           ~ 21 0
16 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 327 0
17 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 477 0
18 W 51e1 Rad 19 23 43.77 +14 30 25.9           ~ 118 0
19 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 189 0
20 W 51 SNR 19 23 50 +14 06.0           ~ 1192 1
21 NAME NGC 7129 FIR 2 IR 21 44 01.5 +66 03 40           ~ 89 0

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2021.09.18-15:15:25

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