The Reservoir of the Per-emb-2 Streamer
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| Format: | Preprint |
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2024
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| _version_ | 1866913257539764224 |
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| author | Taniguchi, Kotomi Pineda, Jaime E Caselli, Paola Shimoikura, Tomomi Friesen, Rachel K. Segura-Cox, Dominique M. Schmiedeke, Anika |
| author_facet | Taniguchi, Kotomi Pineda, Jaime E Caselli, Paola Shimoikura, Tomomi Friesen, Rachel K. Segura-Cox, Dominique M. Schmiedeke, Anika |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_19099 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Reservoir of the Per-emb-2 Streamer Taniguchi, Kotomi Pineda, Jaime E Caselli, Paola Shimoikura, Tomomi Friesen, Rachel K. Segura-Cox, Dominique M. Schmiedeke, Anika Astrophysics of Galaxies Earth and Planetary Astrophysics Solar and Stellar Astrophysics 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. |
| title | The Reservoir of the Per-emb-2 Streamer |
| topic | Astrophysics of Galaxies Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2402.19099 |