2014A&A...568A..65F


Query : 2014A&A...568A..65F

2014A&A...568A..65F - Astronomy and Astrophysics, volume 568A, 65-65 (2014/8-1)

The hot core towards the intermediate-mass protostar NGC 7129 FIRS 2. Chemical similarities with Orion KL.

FUENTE A., CERNICHARO J., CASELLI P., McCOEY C., JOHNSTONE D., FICH M., VAN KEMPEN T., PALAU A., YILDIZ U.A., TERCERO B. and LOPEZ A.

Abstract (from CDS):

This paper is dedicated to the study of the chemistry of the intermediate-mass (IM) hot core NGC 7129 FIRS 2, probably the most compact warm core found in the 2-8M stellar mass range. Our aim is to determine the chemical composition of the IM hot core NGC 7129 FIRS 2, and to provide new insights on the chemistry of hot cores in a more general context. NGC 7129 FIRS 2 (hereafter, FIRS 2) is located at a distance of 1250 pc and high spatial resolution observations are required to resolve the hot core at its center. We present a molecular survey from 218200MHz to 221800MHz carried out with the IRAM Plateau de Bure Interferometer (PdBI). These observations were complemented with a long integration single-dish spectrum taken with the IRAM 30m telescope in Pico de Veleta (Spain). We used a local thermodynamic equilibrium (LTE) single temperature code to model the whole dataset. The interferometric spectrum is crowded with a total of ≃300 lines from which a few dozen remain unidentified. The spectrum has been modeled with a total of 20 species and their isomers, isotopologues, and deuterated compounds. Complex molecules like methyl formate (CH3OCHO), ethanol (CH3CH2OH), glycolaldehyde (CH2OHCHO), acetone (CH3COCH3), dimethyl ether (CH3OCH3), ethyl cyanide (CH3CH2CN), and the aGg' conformer of ethylene glycol (aGg'-(CH2OH)2) are among the detected species. The detection of vibrationally excited lines of CH3CN, CH3OCHO, CH3OH, OCS, HC3N, and CH3CHO proves the existence of gas and dust at high temperatures. The gas kinetic temperature estimated from the vibrational lines of CH3CN, ∼405–67+100K, is similar to that measured in massive hot cores. Our data allow an extensive comparison of the chemistry in FIRS 2 and the Orion hot core. We find a quite similar chemistry in FIRS 2 and Orion. Most of the studied fractional molecular abundances agree within a factor of 5. Larger differences are only found for the deuterated compounds D2CO and CH2DOH and a few molecules (CH3CH2CN, SO2, HNCO and CH3CHO). Since the physical conditions are similar in both hot cores, only different initial conditions (warmer pre-collapse and collapse phase in the case of Orion) and/or different crossing times of the gas in the hot core can explain this behavior. We discuss these two scenarios.

Abstract Copyright:

Journal keyword(s): astrochemistry - stars: formation - ISM: individual objects: NGC 7129 FIRS 2

VizieR on-line data: <Available at CDS (J/A+A/568/A65): table.dat table.fits>

Simbad objects: 25

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Number of rows : 25
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           ~ 414 3
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 632 1
3 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 472 0
4 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1269 1
5 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 570 0
6 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 176 0
7 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 186 2
8 NAME AFGL 5142 IRS 2 * 05 30 46.0699160885 +33 47 54.255210315           ~ 5 0
9 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2091 1
10 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 180 0
11 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 596 1
12 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1104 1
13 NAME IRAS 16293-2422B Y*O 16 32 22.63 -24 28 31.8           ~ 207 0
14 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2020 1
15 [KVV2010] SMM4-W out 18 29 11.60 +01 13 18.1           ~ 8 0
16 NAME SH 2-68 FIR 1 cor 18 29 49.63 +01 15 21.9           ~ 244 2
17 NAME Serpens SMM 4 cor 18 29 57.1 +01 13 15           ~ 128 0
18 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 327 0
19 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 732 0
20 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 512 0
21 IC 1396 OpC 21 39 00 +57 29.4           ~ 450 1
22 NAME IC 1396 North CGb 21 40 42.6537 +58 16 01.882           ~ 183 1
23 NGC 7129 OpC 21 42 56 +66 06.2     11.5     ~ 238 0
24 NAME NGC 7129 FIR 2 IR 21 44 01.5 +66 03 40           ~ 88 0
25 LDN 1204A DNe 22 21 22.5 +63 51 13           ~ 96 0

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2021.07.25-01:59:04

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