L 1287 (H_2_O): accretion disk-impinging-clumps traced by masers?

Details L 1287 (H_2_O): accretion disk-impinging-clumps traced by masers? L 1287 (H_2_O): accretion disk-impinging-clumps traced by masers?

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327..758f&link_type=abstract

Astronomy and Astrophysics, v.327, p.758-770

Astronomy and Astrophysics

Astrophysics

13

Accretion Disks, Masers, Shock Waves, Stars: Formation, Ism: Kinematics And Dynamics, Radio Lines: Ism, Ism: L 1287

Scientific paper

An earlier multi-epoch high angular resolution study of the 22GHz H_2_O maser emission from the dark cloud core L 1287 presented an unusual position-velocity distribution of the identified masers. Since the observational results could only unsatisfactorily be modeled in terms of an outflow association, the alternative interpretation of a disk origin is investigated in some more detail. Clumpy mass infall onto the accretion disk around the embedded protostar in L 1287 is identified as the hydrodynamic trigger mechanism for the maser excitation. Shock compressed clump layers are found likely to have the required density, temperature and column density for detectable 22GHz H_2_O maser emission. A simplified model of the velocity field in the shocked clump layers leads to a remarkable agreement with the position-velocity distribution of the observed masers.

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