High-resolution Near-infrared Spectroscopy of Diffuse Sources around MWC
  1080
  To reveal the origins of diffuse H-alpha emissions observed around the Herbig
star MWC 1080, we have performed a high-resolution near-infrared (NIR)
spectroscopic observation using the Immersion GRating INfrared Spectrograph
(IGRINS). In the NIR H and K bands, we detected various emission lines (six
hydrogen Brackett lines, seven H2 lines, and an [Fe II] line) and compared
their spatial locations with the optical (H-alpha and [S II]) and radio (13CO
and CS) line maps. The shock-induced H2 and [Fe II] lines indicate the presence
of multiple outflows, consisting of at least three, associated young stars in
this region. The kinematics of H2 and [Fe II] near the northeast (NE) cavity
edge supports that the NE main outflow from MWC 1080A is the blueshifted one
with a low inclination angle. The H2 and [Fe II] lines near the southeast
molecular region newly reveal that additional highly-blueshifted outflows
originate from other young stars. The fluorescent H2 lines were found to trace
photodissociation regions formed on the cylindrical surfaces of the main
outflow cavity, which are expanding outward with a velocity of about 10-15
km/s. For the H-alpha emission, we identify its components associated with two
stellar outflows and two young stars in addition to the dominant component of
MWC 1080A scattered by dust. We also report a few faint H-alpha features
located ~0.4 pc away in the southwest direction from MWC 1080A, which lie near
the axes of the NE main outflow and one of the newly-identified outflows.
