The outflow activity of the protostars
in S140 IRS
Thomas Preibisch & Michael D. Smith
Astronomy & Astrophysics, 383, 540 (2002)
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
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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