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The Reservoir of the Per-emb-2 Streamer
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2024-04-17 , DOI: 10.3847/1538-4357/ad2fa1 Kotomi Taniguchi , Jaime E. Pineda , Paola Caselli , Tomomi Shimoikura , Rachel K. Friesen , Dominique M. Segura-Cox , Anika Schmiedeke
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2024-04-17 , DOI: 10.3847/1538-4357/ad2fa1 Kotomi Taniguchi , Jaime E. Pineda , Paola Caselli , Tomomi Shimoikura , Rachel K. Friesen , Dominique M. Segura-Cox , Anika Schmiedeke
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 (HC3N, HC5N, CCH, and CCS) in the 3 mm and 7 mm bands toward the streamer flowing to the Class 0 young stellar object (YSO) Per-emb-2 with the Nobeyama 45 m radio telescope. A region with a diameter of ∼0.04 pc is located to the north at a distance of ∼20,500 au from the YSO. The streamer connects to this northern region, which is its origin. The reservoir has high density and low temperature (
n H 2 ≈ 1.9 × 10 4 cm−3, T
kin = 10 K), which are similar to those of early-stage starless cores. By comparison of the observed abundance ratios of CCS/HC3N 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
⊙. It has been estimated that, if all of the gas in the reservoir were to accrete onto the Per-emb-2 protostellar system, the lifetime of the streamer would be (1.1–3.2) × 105 yr, suggesting that the mass accretion via the streamer would continue until the end of the Class I stage.
更新日期：2024-04-17
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