The Reservoir of the Per-emb-2 Streamer
| Autor: | Taniguchi, Kotomi, Pineda, Jaime E, Caselli, Paola, Shimoikura, Tomomi, Friesen, Rachel K., Segura-Cox, Dominique M., Schmiedeke, Anika |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Streamers bring gas from outer regions to protostellar systems and could change the chemical composition around protostars and protoplanetary disks. We have carried out mapping observations of carbon-chain species (HC$_3$N, HC$_5$N, CCH, and CCS) in the 3mm and 7mm bands toward the streamer flowing to the Class 0 young stellar object (YSO) Per-emb-2 with the Nobeyama 45m radio telescope. A region with a diameter of $\sim0.04$ pc is located north with a distance of $\sim 20,500$ au from the YSO. The streamer connects to this north region which is the origin of the streamer. The reservoir has high density and low temperature ($n_{\rm {H}_2} \approx 1.9 \times 10^4$ cm$^{-3}$, $T_{\rm {kin}} = 10$ K), which are similar to those of early stage starless cores. By comparisons with the observed abundance ratios of CCS/HC$_3$N to the chemical simulations, the reservoir and streamer are found to be chemically young. The total mass available for the streamer is derived to be $24-34$ M$_{\odot}$. If all of the gas in the reservoir will accrete onto the Per-emb-2 protostellar system, the lifetime of the streamer has been estimated at ($1.1 - 3.2$)$\times10^{5}$ yr, suggesting that the mass accretion via the streamer would continue until the end of the Class I stage. Comment: Accepted for The Astrophysical Journal (ApJ), 18 pages, 10 figures, 6 tables |
| Databáze: | arXiv |
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