Deuterium fractionation across the infrared-dark cloud G034.77-00.55 interacting with the supernova remnant W44
Artikel i vetenskaplig tidskrift, 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: supernova remnants
Astrochemistry
ISM: individual objects: W44
ISM: individual objects: G34.77-00.55
Stars: formation
ISM: clouds
Författare
Giuliana Cosentino
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Jonathan Tan
University of Virginia
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
I. Jimenez-Serra
Centro de Astrobiologia (CAB)
Francesco Fontani
Osservatorio Astrofisico di Arcetri
P. Caselli
Max-Planck-Gesellschaft
Jonathan D. Henshaw
Max-Planck-Gesellschaft
Liverpool John Moores University
Ashley T. Barnes
European Southern Observatory (ESO)
Chi Yan Law
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
European Southern Observatory (ESO)
Serena Viti
Universiteit Leiden
University College London (UCL)
R. Fedriani
Instituto de Astrofisica de Andalucía (IAA)
Chia-Jung Hsu
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Prasanta Gorai
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Shaoshan Zeng
RIKEN
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 675 A190Star formation history of MAssive pRoTostars (SMART)
Europeiska kommissionen (EU) (EC/H2020/101032092), 2021-04-01 -- 2023-03-31.
Chockkompressioner i det interstellära mediet som triggers av Star Formation
Vetenskapsrådet (VR) (2021-05589), 2022-01-01 -- 2023-12-31.
Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/202346676