Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
T. Preibisch and M.D. Smith:
The outflow activity of the protostars in
S140 IRS
Astronomy & Astrophysics 383, 540-547
(2002)
Abstract.
The S140/L1204 cloud contains a deeply embedded region of star
formation and a powerful molecular outflow. In this paper, we present
images of the S140
region obtained in the light of the 2.12 micro-meter molecular hydrogen
emission line and adjacent continuum. Our images reveal several knots
of H_2 line
emission originating from shocked material close to IRS 1 as well as
further out. Strong H_2 shock emission is found north-east of IRS1 (at
position angle of ~
20degr - 30degr), as well as to the south-west of IRS1 (at position
angles around ~ 190degr - 220degr), clearly demonstrating the presence
of outflow activity in
the north-east/south-west direction. We also find patches of H_2
emission several arcminutes away from IRS1 at a position angles of
~150degr and ~340degr,
i.e. in directions consistent with the previously known
north-west/south-east molecular outflow. Our results therefore provide
evidence for the existence of two
distinct bipolar outflow systems originating simultaneously from IRS 1.
We also discuss general aspects of the star formation process in the
S140 region. An
inferred high ratio of stellar to gas mass suggests that the outflows
have dispersed most of the cloud mass.
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