1. A search for cloud cores affected by shocked carbon chain chemistry in L1251
- Author
-
Liu, Xunchuan, Wu, Y., Zhang, C., Chen, X., Lin, L. -H., Qin, S. -L., Liu, T., Henkel, C., Wang, J., Liu, H. -L., Yuan, J., Yuan, L. -X., Li, J., Shen, Z. -Q., Li, D., Esimbek, J., Wang, K., Li, L. -X., Kim, Kee-Tae, Zhu, L., Madones, D., Inostroza, N., Meng, F. -Y., Zhang, Tianwei, Tatematsu, K., Xu, Y., Ju, B. -G., Kraus, A., and Xu, F. -W.
- Subjects
Astrophysics - Astrophysics of Galaxies ,Astrophysics - Solar and Stellar Astrophysics - Abstract
We searched for shocked carbon chain chemistry (SCCC) sources with C$_3$S abundances surpassing those of HC$_5$N towards the dark cloud L1251, using the Effelsberg telescope at K-band (18 -- 26\,GHz). L1251-1 and L1251-3 are identified as the most promising SCCC sources. The two sources harbor young stellar objects. We conducted mapping observations towards L1251-A, the western tail of L1251, at $\lambda$ $\sim$3\,mm with the PMO 13.7 m and the NRO 45 m telescopes in lines of C$_2$H, N$_2$H$^+$, CS, HCO$^+$, SO, HC$_3$N and C$^{18}$O as well as in CO 3--2 using the JCMT. The spectral data were combined with archival data including Spitzer and Herschel continuum maps for further analysis. Filamentary sub-structures labeled as F1 to F6 were extracted in L1251, with F1 being associated with L1251-A hosting L1251-1. The peak positions of dense gas traced by HCO$^+$ are misaligned relative to those of the dust clumps. Episodic outflows are common in this region. The twisted morphology of F1 and velocity distribution along L1251-A may originate from stellar feedback. SCCC in L1251-1 may have been caused by outflow activities originated from the infrared source IRS1. The signposts of ongoing SCCC and the broadened line widths of C$_3$S and C$_4$H in L1251-1 as well as the distribution of HC$_3$N are also related to outflow activities in this region. L1251-1 (IRS1) together with the previously identified SCCC source IRS3 demonstrate that L1251-A is an excellent region to study shocked carbon chain chemistry., Comment: 32 pages, 15 figures
- Published
- 2021
- Full Text
- View/download PDF