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The first detection of deuterated water toward extragalactic hot cores with ALMA

Published online by Cambridge University Press:  09 June 2023

Marta Sewiło
Affiliation:
Exoplanets and Stellar Astrophysics Laboratory and CRESST II, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; email:marta.m.sewilo@nasa.gov Department of Astronomy, University of Maryland, College Park, MD 20742, USA
Agata Karska
Affiliation:
Nicolaus Copernicus University, ul. Grudzikadzka 5, 87-100 Toruń, Poland
Lars E. Kristensen
Affiliation:
Niels Bohr Institute, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark
Steven B. Charnley
Affiliation:
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
C.-H. Rosie Chen
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69 D-53121 Bonn, Germany
Joana M. Oliveira
Affiliation:
Lennard-Jones Laboratories, Keele University, ST5 5BG, UK
Martin Cordiner
Affiliation:
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA The Catholic University of America, Washington, DC 20064, USA
Jennifer Wiseman
Affiliation:
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Álvaro Sánchez-Monge
Affiliation:
I. Physikalisches Institut der Universität zu Köln, Zülpicher Str. 77, 50937, Köln, Germany
Jacco Th. van Loon
Affiliation:
Lennard-Jones Laboratories, Keele University, ST5 5BG, UK
Remy Indebetouw
Affiliation:
Department of Astronomy, University of Virginia, PO Box 400325, Charlottesville, VA 22904, USA National Radio Astronomy Observatory, 520 Edgemont Rd, Charlottesville, VA 22903, USA
Peter Schilke
Affiliation:
I. Physikalisches Institut der Universität zu Köln, Zülpicher Str. 77, 50937, Köln, Germany
Emmanuel Garcia-Berrios
Affiliation:
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA The Catholic University of America, Washington, DC 20064, USA Department of Astronomy, University of Illinois, 1002 W. Green St., Urbana, IL 61801, USA
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Abstract

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We discuss the first detection of deuterated water (HDO) in extragalactic hot cores. The HDO 211–212 line has been detected with the Atacama Large Millimeter/submillimeter Array (ALMA) 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), the nearest star-forming galaxy. We compared the HDO line luminosity (LHDO) measured toward two hot cores in N 105 to those observed toward a sample of 17 Galactic hot cores and found that the observed values of LHDO for the LMC hot cores fit very well into the LHDO trends with Lbol and metallicity observed toward the Galactic hot cores. Our results indicate that LHDO 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 N 105–2 A and 2 B by assuming that HDO/H2O toward the LMC hot cores is the same as that observed in the Milky Way; the obtained values are systematically lower than those measured in the Galactic hot cores. 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.

Type
Contributed Paper
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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