Universität zu Köln

Sewilo, Marta ORCID: 0000-0003-2248-6032, Karska, Agata ORCID: 0000-0001-8913-925X, Kristensen, Lars E., Charnley, Steven B., Chen, C-H Rosie, Oliveira, Joana M., Cordiner, Martin ORCID: 0000-0001-8233-2436, Wiseman, Jennifer, Sanchez-Monge, Alvaro ORCID: 0000-0002-3078-9482, van Loon, Jacco Th, Indebetouw, Remy, Schilke, Peter ORCID: 0000-0003-2141-5689 and Garcia-Berrios, Emmanuel (2022). The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA. Astrophys. J., 933 (1). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

Full text not available from this repository.

Abstract

We report the first detection of deuterated water (HDO) toward an extragalactic hot core. The HDO 2(11)-2(12) line has been detected toward hot cores N 105-2 A and 2 B in the N 105 star-forming region in the low-metallicity Large Magellanic Cloud (LMC) dwarf galaxy with the Atacama Large Millimeter/submillimeter Array (ALMA). We have compared the HDO line luminosity (L (HDO)) measured toward the LMC hot cores to those observed toward a sample of 17 Galactic hot cores covering three orders of magnitude in L (HDO), four orders of magnitude in bolometric luminosity (L (bol)), and a wide range of Galactocentric distances (thus metallicities). The observed values of L (HDO) for the LMC hot cores fit very well into the L (HDO) trends with L (bol) and metallicity observed toward the Galactic hot cores. We have found that L (HDO) seems to be largely dependent on the source luminosity, but metallicity also plays a role. We provide a rough estimate of the H2O column density and abundance ranges toward the LMC hot cores by assuming that HDO/H2O toward the LMC hot cores is the same as that observed in the Milky Way; the estimated ranges are systematically lower than Galactic values. The spatial distribution and velocity structure of the HDO emission in N 105-2 A is consistent with HDO being the product of the low-temperature dust grain chemistry. Our results are in agreement with the astrochemical model predictions that HDO is abundant regardless of the extragalactic environment and should be detectable with ALMA in external galaxies.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sewilo, Marta UNSPECIFIED orcid.org/0000-0003-2248-6032 UNSPECIFIED Karska, Agata UNSPECIFIED orcid.org/0000-0001-8913-925X UNSPECIFIED Kristensen, Lars E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Charnley, Steven B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, C-H Rosie UNSPECIFIED UNSPECIFIED UNSPECIFIED Oliveira, Joana M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cordiner, Martin UNSPECIFIED orcid.org/0000-0001-8233-2436 UNSPECIFIED Wiseman, Jennifer UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Monge, Alvaro UNSPECIFIED orcid.org/0000-0002-3078-9482 UNSPECIFIED van Loon, Jacco Th UNSPECIFIED UNSPECIFIED UNSPECIFIED Indebetouw, Remy UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, Peter UNSPECIFIED orcid.org/0000-0003-2141-5689 UNSPECIFIED Garcia-Berrios, Emmanuel UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-693653
DOI:	10.3847/1538-4357/ac6de1
Journal or Publication Title:	Astrophys. J.
Volume:	933
Number:	1
Date:	2022
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language YOUNG STELLAR OBJECTS; H-II-REGIONS; COMPLEX ORGANIC-MOLECULES; INFRARED SPECTRAL ATLAS; STAR-FORMING REGIONS; HIGH-MASS PROTOSTAR; CHEMICAL-COMPOSITION; ABUNDANCE GRADIENTS; PHYSICAL CONDITIONS; ROTATING TOROIDS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/69365