High-Resolution Molecular Line Observations of the Environment of the Class 0 Source B1-IRS
arXiv:astro-ph/0504176 · doi:10.1086/430773
Abstract
In this work we present VLA observations of the NH3, CCS, and H2O maser emission at 1 cm from the star forming region B1-IRS (IRAS 03301+3057) with ~ 5" (=1750 AU) of angular resolution. CCS emission is distributed in three clumps around the central source. These clumps exhibit a velocity gradient from red- to blueshifted velocities toward B1-IRS, probably due to an interaction with the outflow from an embedded protostar. The outflow and its powering source are traced by a reflection nebula and an associated infrared point source detected in a 2MASS K-band image. We find that this infrared point source is associated with water maser emission distributed in an elongated structure (~ 450 AU size) along the major axis of the reflection nebula and tracing the base of the outflow of the region. Ammonia emission is extended and spatially anticorrelated with CCS. This is the first time that this kind of anticorrelation is observed in a star forming region with such a high angular resolution, and illustrates the importance of time-dependent chemistry on small spatial scales. The relatively large abundance of CCS with respect to ammonia, compared with other star forming regions, suggests an extreme youth for the B1-IRS object (<10E+5 yr). We suggest the possibility that CCS abundance is enhanced via shock-induced chemistry.
arXiv comment31 pages, 9 figures. Accepted by The Astrophysical Journal
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- Low-mass protostars and dense cores in different evolutionary stages in IRAS 00213+6530
- Outflow - Core Interaction in Barnard 1
- Imaging of the CCS 22.3 GHz emission in the Taurus Molecular Cloud complex