Feng, S;
Codella, C;
Ceccarelli, C;
Caselli, P;
Lopez-Sepulcre, A;
Neri, R;
Fontani, F;
... Viti, S; + view all
(2020)
Seeds of Life in Space (SOLIS). IX. Chemical Segregation of SO(2)and SO toward the Low-mass Protostellar Shocked Region of L1157.
The Astrophysical Journal
, 896
(1)
10.3847/1538-4357/ab8813.
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Abstract
We present observations of SO and SO2 lines toward the shocked regions along the L1157 chemically rich outflow, taken in the context of the Seeds of Life in Space IRAM Northern Extended Millimeter Array Large Program, and supported by data from the Submillimeter Array and IRAM-30 m telescope at 1.1–3.6 mm wavelengths. We simultaneously analyze, for the first time, all of the brightest shocks in the blueshifted lobe, namely, B0, B1, and B2. We found the following. (1) SO and SO2 may trace different gas, given that the large(-scale) velocity gradient analysis indicates for SO2 a volume density ( – - 10 10 cm 56 3) denser than that of the gas emitting in SO by a factor up to an order of magnitude. (2) Investigating the 0.1 pc scale field of view, we note a tentative gradient along the path of the precessing jet. More specifically, c( ) SO SO2 decreases from the B0–B1 shocks to the older B2. (3) At a linear resolution of 500–1400 au, a tentative spatial displacement between the two emitting molecules is detected, with the SO peak closer (with respect to SO2) to the position where the recent jet is impinging on the B1 cavity wall. Our astrochemical modeling shows that the SO and SO2 abundances evolve on timescales less than about 1000 years. Furthermore, the modeling requires high abundances (2 × 10−6 ) of both H2S H and S/H injected in the gas phase due to the shock occurrence, so prefrozen OCS only is not enough to reproduce our new observations.
| Type: | Article |
|---|---|
| Title: | Seeds of Life in Space (SOLIS). IX. Chemical Segregation of SO(2)and SO toward the Low-mass Protostellar Shocked Region of L1157 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/ab8813 |
| Publisher version: | http://dx.doi.org/10.3847/1538-4357/ab8813 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Stars: formation; Stars: low-mass; ISM: lines and bands; Submillimeter: ISM |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10105360 |
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