Gieser, C., Semenov, D., Beuther, H., Ahmadi, A., Mottram, J. C., Henning, Th., 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 Moeller, T. (2019). Chemical complexity in high-mass star formation An observational and modeling case study of the AFGL2591 VLA3 hot core. Astron. Astrophys., 631. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

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 VLA3 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 1.37mm with an angular resolution of similar to 0.'' 42 (1400 au at 3.33 kpc), 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 <1400 au. 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 similar to 21 100 yr. 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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Gieser, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Semenov, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beuther, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ahmadi, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mottram, J. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Henning, Th.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beltran, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Maud, L. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bosco, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leurini, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peters, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klaassen, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuiper, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Feng, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Urquhart, J. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moscadelli, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csengeri, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lumsden, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Winters, J. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Suri, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zhang, Q.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pudritz, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palau, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, K. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Galvan-Madrid, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wyrowski, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Monge, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Linz, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Johnston, K. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jimenez-Serra, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Longmore, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moeller, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-127938
DOI: 10.1051/0004-6361/201935865
Journal or Publication Title: Astron. Astrophys.
Volume: 631
Date: 2019
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PROTOSTELLAR CANDIDATES; MILLIMETER CONTINUUM; PHYSICAL CONDITIONS; MOLECULAR OUTFLOWS; DUST CONTINUUM; CHEMISTRY; SUBMILLIMETER; EVOLUTION; EMISSION; ENVELOPESMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/12793

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