Deuterium fractionation across the infrared-dark cloud G034.77-00.55 interacting with the supernova remnant W44
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| Název: | Deuterium fractionation across the infrared-dark cloud G034.77-00.55 interacting with the supernova remnant W44 |
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| Autoři: | Cosentino, Giuliana, 1990, Tan, Jonathan, 1973, Jimenez-Serra, I., Fontani, Francesco, Caselli, P., Henshaw, Jonathan D., Barnes, Ashley T., Law, Chi Yan, 1990, Viti, Serena, Fedriani, R., Hsu, Chia-Jung, 1991, Gorai, Prasanta, 1991, Zeng, Shaoshan |
| Zdroj: | Chockkompressioner i det interstellära mediet som triggers av Star Formation Star formation history of MAssive pRoTostars (SMART) Astronomy and Astrophysics. 675 |
| Témata: | ISM: individual objects: G34.77-00.55, ISM: individual objects: W44, Stars: formation, ISM: clouds, ISM: supernova remnants, Astrochemistry |
| Popis: | 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. |
| Popis souboru: | electronic |
| Přístupová URL adresa: | https://research.chalmers.se/publication/536909 https://research.chalmers.se/publication/536909/file/536909_Fulltext.pdf |
| Databáze: | SwePub |
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Nájsť tento článok vo Web of Science | Abstrakt: | 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. |
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| ISSN: | 00046361 14320746 |
| DOI: | 10.1051/0004-6361/202346676 |