Deuterium fractionation across the infrared-dark cloud G034.77-00.55 interacting with the supernova remnant W44
Journal article, 2023
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.
ISM: individual objects: G34.77-00.55
ISM: individual objects: W44
Stars: formation
ISM: clouds
ISM: supernova remnants
Astrochemistry
Author
Giuliana Cosentino
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Jonathan Tan
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
University of Virginia
I. Jimenez-Serra
Centro de Astrobiologia (CAB)
Francesco Fontani
Arcetri Astrophysical Observatory
P. Caselli
Max Planck Society
Jonathan D. Henshaw
Max Planck Society
Liverpool John Moores University
Ashley T. Barnes
European Southern Observatory (ESO)
Chi Yan Law
European Southern Observatory (ESO)
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Serena Viti
University College London (UCL)
Leiden University
R. Fedriani
Spanish National Research Council (CSIC)
Chia-Jung Hsu
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Prasanta Gorai
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Shaoshan Zeng
RIKEN
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 675 A190Shock Compressions in the Interstellar Medium as triggers of Star Formation
Swedish Research Council (VR) (2021-05589), 2022-01-01 -- 2023-12-31.
Star formation history of MAssive pRoTostars (SMART)
European Commission (EC) (EC/H2020/101032092), 2021-04-01 -- 2023-03-31.
Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/202346676