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- W3124390047 abstract "We present the first detection of N2H+ toward a low-mass protostellar outflow, namely, the L1157-B1 shock, at ∼0.1 pc from the protostellar cocoon. The detection was obtained with the IRAM 30 m antenna. We observed emission at 93 GHz due to the J = 1–0 hyperfine lines. Analysis of this emission coupled with HIFI CHESS multiline CO observations leads to the conclusion that the observed N2H+(1–0) line originated from the dense (⩾105 cm−3) gas associated with the large (20''–25'') cavities opened by the protostellar wind. We find an N2H+ column density of a few 1012 cm−2 corresponding to an abundance of (2–8) × 10−9. The N2H+ abundance can be matched by a model of quiescent gas evolved for more than 104 yr, i.e., for more than the shock kinematical age (≃2000 yr). Modeling of C-shocks confirms that the abundance of N2H+ is not increased by the passage of the shock. In summary, N2H+ is a fossil record of the pre-shock gas, formed when the density of the gas was around 104 cm−3, and then further compressed and accelerated by the shock." @default.
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- W3124390047 date "2013-09-25" @default.
- W3124390047 modified "2023-10-18" @default.
- W3124390047 title "BROAD N2H+EMISSION TOWARD THE PROTOSTELLAR SHOCK L1157-B1" @default.
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- W3124390047 doi "https://doi.org/10.1088/0004-637x/776/1/52" @default.
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