Detection of deuterated molecules, but not of lithium hydride, in the <i>z</i> = 0.89 absorber toward PKS 1830−211

Müller, S.; Roueff, E.; Black, J. H.; Gérin, M.; Guèlin, M.; Menten, K. M.; Henkel, C.; Aalto, S.; Combes, F.; Martín, S.; Martí-Vidal, Iván

doi:10.1051/0004-6361/202037628

Cited by 12 publications

(19 citation statements)

References 54 publications

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“…The astrochemical models of deuterated species predict that HDO is abundant regardless of the extragalactic environment (starburst, cosmic-rays-enhanced environments, low-metallicity, and high-redshift galaxies) and should be detectable with ALMA in many diverse galaxies (Bayet et al 2010). Our results for the LMC and the detection of HDO toward the z=0.89 absorber against the quasar PKS 1830−211 by Muller et al (2020) are in agreement with these model predictions. Furthermore, our work demonstrates the utility of HDO as a tracer of H 2 O chemistry, which is more readily accessible than H 2 O using ground-based, mm-wave observations.…”

Section: Discussionsupporting

confidence: 87%

“…The first, and until now the only, extragalactic detection of HDO was reported by Muller et al (2020). Using the Atacama Large Millimeter/submillimeter Array (ALMA), Muller et al (2020) detected the HDO J Ka,Kc = 1 01 -0 00 absorption line at 464.9245 GHz in a spiral galaxy at a redshift (z) of 0.89 on the line of sight toward the quasar PKS 1830−211. Here, we report the first detection of HDO toward extragalactic hot molecular cores.…”

Section: Introductionmentioning

confidence: 99%

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The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA

Sewiło,

Karska,

Kristensen

et al. 2022

Preprint

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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 seventeen 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 H 2 O column density and abundance ranges toward the LMC hot cores by assuming that HDO/H 2 O 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.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA

Sewiło,

Karska,

Kristensen

et al. 2022

Preprint

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“…Martín et al (2006) reported a tentative detection of DNC and N 2 D + in the nucleus of the starburst galaxy NGC 253. Most recently, Muller et al (2020) reported the detection of ND, NH 2 D, and HDO with ALMA at redshift z = 0.89 in the spiral galaxy intercepting the line of sight to quasar PKS 1830−211. We detected deuterated formaldehyde (HDCO), deuterated hydrogen sulfide (HDS), and deuterated water (HDO) toward hot cores 2 A (HDCO and HDO) and 2 B (HDO), and a hot core candidate 2 C (HDS).…”

Section: Line Identificationmentioning

confidence: 99%

ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N 105 Star-forming Region

Sewiło

Cordiner

Charnley

et al. 2022

ApJ

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The Large Magellanic Cloud (LMC) is the nearest laboratory for detailed studies on the formation and survival of complex organic molecules (COMs), including biologically important ones, in low-metallicity environments—typical of earlier cosmological epochs. We report the results of 1.2 mm continuum and molecular line observations of three fields in the star-forming region N 105 with the Atacama Large Millimeter/submillimeter Array. N 105 lies at the western edge of the LMC bar with ongoing star formation traced by H2O, OH, and CH3OH masers, ultracompact H ii regions, and young stellar objects. Based on the spectral line modeling, we estimated rotational temperatures, column densities, and fractional molecular abundances for 12 1.2 mm continuum sources. We identified sources with a range of chemical makeups, including two bona fide hot cores and four hot core candidates. The CH3OH emission is widespread and associated with all the continuum sources. COMs CH3CN and CH3OCH3 are detected toward two hot cores in N 105 together with smaller molecules typically found in Galactic hot cores (e.g., SO2, SO, and HNCO) with the molecular abundances roughly scaling with metallicity. We report a tentative detection of the astrobiologically relevant formamide molecule (NH2CHO) toward one of the hot cores; if confirmed, this would be the first detection of NH2CHO in an extragalactic subsolar metallicity environment. We suggest that metallicity inhomogeneities resulting from the tidal interactions between the LMC and the Small Magellanic Cloud might have led to the observed large variations in COM abundances in LMC hot cores.

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“…A total of 54 molecular species (not counting isotopologues) have been identified in the parts of the spectrum surveyed to date: a 20 GHz-wide band at 7-mm wavelength with the ATCA interferometer and the Yebes 40-m telescope, a 8 GHz-wide band at 3-mm with NOEMA, and a 38 GHz-wide band between 3-mm and 0.6-mm with ALMA (Muller et al, 2011;Muller et al, 2014;Muller et al, 2016;Muller et al, 2017) and references therein (Muller et al, 2020;Tercero et al, 2020).…”

Section: Molecules Inside An Arm Of a Spiral Galaxy At Redshift Z = 089mentioning

confidence: 99%

Organic Molecules in Interstellar Space: Latest Advances

Guèlin

Cernicharo

2022

Front. Astron. Space Sci.

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Although first considered as too diluted for the formation of molecules in-situ and too harsh an environment for their survival, the interstellar medium has turned out to host a rich palette of molecular species: to date, 256 species, not counting isotopologues, have been identified. The last decade, and more particularly the last 2 years, have seen an explosion of new detections, including those of a number of complex organic species, which may be dubbed as prebiotic. Organic molecules have been discovered not just in interstellar clouds from the Solar neighbourhood, but also throughout the Milky-Way, as well as in nearby galaxies, or some of the most distant quasars. These discoveries were made possible by the completion of large sub-millimetre and radio facilities. Equipped with new generation receivers, those instruments have provided the orders of magnitude leap in sensitivity required to detect the vanishingly weak rotational lines that allowed the molecule identifications. Last 2 years, 30 prebiotic molecules have been detected in TMC-1, a dust-enshrouded gaseous cloud located at 400 light-years from the Sun in the Taurus constellation. Ten new molecular species, have been identified in the arm of a spiral galaxy seven billion light-yr distant, and 12 molecular species observed in a quasar at 11 billion light-yr. We present the latest spectral observations of this outlying quasar and discuss the implications of those detections in these 3 archetypal sources. The basic ingredients involved in the Miller-Urey experiment and related experiments (H2, H2O, CH4, NH3, CO, H2S, … ) appeared early after the formation of the first galaxies and are widespread throughout the Universe. The chemical composition of the gas in distant galaxies seems not much different from that in the nearby interstellar clouds. It presumably comprises, like for TMC-1, aromatic rings and complex organic molecules putative precursors of the RNA nucleobases, except the lines of such complex species are too weak to be detected that far.

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Detection of deuterated molecules, but not of lithium hydride, in the z = 0.89 absorber toward PKS 1830−211

Cited by 12 publications

References 54 publications

The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA

The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA

ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N 105 Star-forming Region

Organic Molecules in Interstellar Space: Latest Advances

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