Universität zu Köln

Palau, Aina ORCID: 0000-0002-9569-9234, Walsh, Catherine, Sanchez-Monge, Alvaro, Girart, Josep M., Cesaroni, Riccardo ORCID: 0000-0002-2430-5103, Jimenez-Serra, Izaskun, Fuente, Asuncion, Zapata, Luis A. and Neri, Roberto (2017). Complex organic molecules tracing shocks along the outflow cavity in the high-mass protostar IRAS 20126+4104. Mon. Not. Roy. Astron. Soc., 467 (3). S. 2723 - 2753. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We report on subarcsecond observations of complex organic molecules (COMs) in the highmass protostar IRAS 20126+4104 with the Plateau de Bure Interferometer in its most extended configurations. In addition to the simple molecules SO, HNCOandH(2) (CO)-C-13, we detect emission from CH3CN, CH3OH, HCOOH, HCOOCH3, CH3OCH3, CH3CH2CN, CH3COCH3, NH2CN and (CH2OH)(2). SO and HNCO present a X-shaped morphology consistent with tracing the outflow cavity walls. Most of the COMs have their peak emission at the putative position of the protostar, but also show an extension towards the south (east), coinciding with an H-2 knot from the jet at about 800-1000 au from the protostar. This is especially clear in the case of H-2 (CO)-C-13 and CH3OCH3. We fitted the spectra at representative positions for the disc and the outflow, and found that the abundances of most COMs are comparable at both positions, suggesting that COMs are enhanced in shocks as a result of the passage of the outflow. By coupling a parametric shock model to a large gas-grain chemical network including COMs, we find that the observed COMs should survive in the gas phase for similar to 2000 yr, comparable to the shock lifetime estimated from the water masers at the outflow position. Overall, our data indicate that COMs in IRAS 20126+4104 may arise not only from the disc, but also from dense and hot regions associated with the outflow.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Palau, Aina UNSPECIFIED orcid.org/0000-0002-9569-9234 UNSPECIFIED Walsh, Catherine UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Monge, Alvaro UNSPECIFIED UNSPECIFIED UNSPECIFIED Girart, Josep M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cesaroni, Riccardo UNSPECIFIED orcid.org/0000-0002-2430-5103 UNSPECIFIED Jimenez-Serra, Izaskun UNSPECIFIED UNSPECIFIED UNSPECIFIED Fuente, Asuncion UNSPECIFIED UNSPECIFIED UNSPECIFIED Zapata, Luis A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Neri, Roberto UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-230122
DOI:	10.1093/mnras/stx004
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	467
Number:	3
Page Range:	S. 2723 - 2753
Date:	2017
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CHEMICAL KINETIC DATABASE; YOUNG STELLAR OBJECTS; ORION-KL; GAS-PHASE; PROTOPLANETARY DISKS; METHYL FORMATE; COMBUSTION CHEMISTRY; PRESTELLAR CORES; FORMING REGIONS; DIMETHYL ETHER Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23012