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Deuterium fractionation across the infrared-dark cloud G034.77-00.55 interacting with the supernova remnant W44

Cosentino, G, Tan, JC, Jiménez-Serra, I, Fontani, F, Caselli, P, Henshaw, JD, Barnes, AT, Law, CY, Viti, S, Fedriani, R, Hsu, CJ, Gorai, P and Zeng, S (2023) Deuterium fractionation across the infrared-dark cloud G034.77-00.55 interacting with the supernova remnant W44. Astronomy & Astrophysics, 675. pp. 1-9. ISSN 0004-6361

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Supernova remnants (SNRs) may regulate star formation in galaxies. For example, SNR-driven shocks may form new molecular gas or compress pre-existing clouds and trigger the formation of new stars. Aims. To test this scenario, we measured the deuteration of N2H+, DNfrac 2H+- a well-studied tracer of pre-stellar cores - across the infrared-dark cloud (IRDC) G034.77-00.55, which is known to be experiencing a shock interaction with the SNR W44. Methods. We use N2H+ and N2D+ J = 1-0 single pointing observations obtained with the 30m antenna at the Instituto de Radioastronomia Millimetrica to infer DN2H+ frac towards five positions across the cloud, namely a massive core, different regions across the shock front, a dense clump, and ambient gas. Results. We find DN2H+ frac in the range 0.03-0.1, which is several orders of magnitude larger than the cosmic D/H ratio (∼10-5). The DN2H+ frac across the shock front is enhanced by more than a factor of 2 (DNfrac 2H+∼ 0.05-0.07) with respect to the ambient gas (=0.03) and similar to that measured generally in pre-stellar cores. Indeed, in the massive core and dense clump regions of this IRDC we measure DN2H+ frac ∼ 0.1.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
SWORD Depositor: A Symplectic
Date Deposited: 10 May 2024 12:17
Last Modified: 10 May 2024 12:30
DOI or ID number: 10.1051/0004-6361/202346676
URI: https://researchonline.ljmu.ac.uk/id/eprint/23229
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