Near-IR imaging towards a puzzling YSO precessing jet
  At present there are many studies concerning jets towards low-mass young
stellar objects, while equivalent studies towards massive or intermediate-mass
young stellar objects are scarce. In a previous study, we found highly
misaligned molecular outflows towards the infrared point source IRS. Using
near-IR data acquired with Gemini-NIRI at the JHKs-broad-bands and narrow-bands
centered at the emission lines of [FeII], H2 1-0 S(1), H2 2-1 S(1), Br-gamma,
and CO 2-0 (bh), we studied the circumstellar environment of IRS with an
angular resolution between 0.35" and 0.45". The emission in the
JHKs-broad-bands shows, with great detail, the presence of a cone-like shape
nebula extending to the north/northeast of the point source, which appears to
be attached to it by a jet-like structure. In the three bands the nebula is
resolved in a twisted-shaped feature composed by two arc-like features and a
bow shock-like structure seen mainly in the Ks-band, which strongly suggests
the presence of a precessing jet. An analysis of proper motions based on our
Gemini observations and UKIDSS data gives additional support to the precession
scenario. We are presenting one of the best resolved cone-like nebula likely
related to a precessing jet up to date. The analysis of the observed
near-infrared lines shows that the H2 is collisionally excited, and the
spatially coincidence of the [FeII] and H2 emissions in the closer arc-like
feature suggests that this region is affected by a J-shock. The second arc-like
feature presents H2 emission without [FeII] which suggests the presence of a
nondisociative C-shock or a less energetic J-shock. The H2 1-0 S(1) continuum
subtracted image, reveals several knots and filaments at a larger spatial scale
around IRS, in perfect matching with the distribution of the red and
blueshifted molecular outflows discovered in our previous work.
