2019A&A...631A.142G


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET12:35:29

2019A&A...631A.142G - Astronomy and Astrophysics, volume 631A, 142-142 (2019/11-1)

Chemical complexity in high-mass star formation. An observational and modeling case study of the AFGL 2591 VLA 3 hot core.

GIESER C., SEMENOV D., BEUTHER H., AHMADI A., MOTTRAM J.C., HENNING T., BELTRAN M., MAUD L.T., BOSCO F., LEURINI S., PETERS T., KLAASSEN P., KUIPER R., FENG S., URQUHART J.S., MOSCADELLI L., CSENGERI T., LUMSDEN S., WINTERS J.M., SURI S., ZHANG Q., PUDRITZ R., PALAU A., MENTEN K.M., GALVAN-MADRID R., WYROWSKI F., SCHILKE P., SANCHEZ-MONGE A., LINZ H., JOHNSTON K.G., JIMENEZ-SERRA I., LONGMORE S. and MOLLER T.

Abstract (from CDS):


Aims. In order to understand the observed molecular diversity in high-mass star-forming regions, we have to determine the underlying physical and chemical structure of those regions at high angular resolution and over a range of evolutionary stages.
Methods. We present a detailed observational and modeling study of the hot core VLA 3 in the high-mass star-forming region AFGL 2591, which is a target region of the NOrthern Extended Millimeter Array (NOEMA) large program CORE. Using NOEMA observations at 1.37 mm with an angular resolution of ∼0.42" (1400au at 3.33kpc), we derived the physical and chemical structure of the source. We modeled the observed molecular abundances with the chemical evolution code MUSCLE (MUlti Stage ChemicaL codE).
Results. With the kinetic temperature tracers CH3CN and H2CO we observe a temperature distribution with a power-law index of q=0.41±0.08. Using the visibilities of the continuum emission we derive a density structure with a power-law index of p=1.7±0.1. The hot core spectra reveal high molecular abundances and a rich diversity in complex molecules. The majority of the molecules have an asymmetric spatial distribution around the forming protostar(s), which indicates a complex physical structure on scales <1400au. Using MUSCLE, we are able to explain the observed molecular abundance of 10 out of 14 modeled species at an estimated hot core chemical age of ∼21100yr. In contrast to the observational analysis, our chemical modeling predicts a lower density power-law index of p<1.4. Reasons for this discrepancy are discussed.
Conclusions. Combining high spatial resolution observations with detailed chemical modeling allows us to derive a concise picture of the physical and chemical structure of the famous AFGL 2591 hot core. The next steps are to conduct a similar analysis for the whole CORE sample, and then use this analysis to constrain the chemical diversity in high-mass star formation to a much greater depth.

Abstract Copyright: © C. Gieser et al. 2019

Journal keyword(s): ISM: individual objects: AFGL 2591 - astrochemistry - ISM: molecules - stars: massive

CDS comments: Paragraph 1. VLA 3-N not in SIMBAD.

Simbad objects: 23

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Number of rows : 23

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 W 3(H2O) Mas 02 27 04.6 +61 52 25           ~ 124 0
2 IRAS 05358+3543 mul 05 39 10.4 +35 45 19           ~ 137 1
3 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 665 2
4 GAL 000.0+00.0 gam 17 45 39.60213 -29 00 22.0000           ~ 12012 0
5 SCAMPS G8.68-0.37 smm 18 06 23.24 -21 37 14.1           ~ 11 0
6 RAFGL 2136 SFR 18 22 26.8740 -13 30 17.177           ~ 254 0
7 AGAL G028.344+00.061 cor 18 42 50.45 -04 03 17.7           ~ 70 0
8 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 323 0
9 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 403 0
10 QSO J2015+371 BLL 20 15 28.7298087 +37 10 59.514637     21.82 21.4   ~ 254 2
11 2MASS J20292393+4011105 IR 20 29 23.930 +40 11 10.56           ~ 2 0
12 NAME AFGL 2591 N5 Rad 20 29 24.00 +40 11 10.3           ~ 4 0
13 NAME AFGL 2591 N4 Rad 20 29 24.32 +40 11 28.0           ~ 8 1
14 NAME AFGL 2591 N2 Y*O 20 29 24.52 +40 11 20.1           ~ 18 1
15 NAME AFGL 2591 N1 Y*O 20 29 24.59 +40 11 15.0           ~ 20 1
16 NAME AFGL 2591 N3 Y*O 20 29 24.88 +40 11 19.5           ~ 35 1
17 RAFGL 2591 Y*O 20 29 25.03656 +40 11 20.3316           ~ 573 0
18 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 720 0
19 3C 418.0 QSO 20 38 37.0346600 +51 19 12.661988   21.30 20.00 18.9   ~ 277 0
20 LDN 1204A DNe 22 21 22.5 +63 51 13           ~ 92 0
21 3C 454.3 Bla 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2557 2
22 NGC 7538S Y*O 23 13 44.8 +61 26 51           ~ 74 1
23 IRAS 23118+6110 Y*O 23 14 01.63 +61 27 20.2           ~ 349 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-12:35:29

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