Merlin and Puschino Observations of H2o Masers in Outer Galactic SFR S128N |
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| Authors: | A M S Richards R J Cohen M Crocker E E Lekht E Mendoza V A Samodurov |
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| Institution: | (1) JBO, University of Manchester, Macclesfield, UK;(2) INAOE, 72840 Tonantzintla, Puebla, México;(3) Astro Space Centre, LPI, Profsoyuznaya 84/32, Moscow, Russia |
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| Abstract: | We have imaged H2O maser emission from the star-forming region S128 at milli-arcsec resolution using MERLIN, to complement 20 years of monitoring data from the Puschino radio telescope. The drift velocities of the masers and the velocity and location of a new maser region add depth to the model of two colliding CO clouds triggering collapse. Some H2O masers appear to originate directly from this shock front. The brightest maser appears typical of a YSO jet and remains unsaturated close to peak intensity. The distribution of maser clumps has a fractal dimension  0.4; combined with analysis of drift velocity variations this suggests that the masers trace the dissipation of supersonic turbulence. The spatial distribution of velocities shows that this is in parts more structured than the Kolmogorov cascade. |
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| Keywords: | ISM: evolution ISM: jets and outflows masers stars: pre-main-sequence shock waves |
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