JHKL Imaging and K Polarimetry of the Bipolar Outflow NGC 2071

Details JHKL Imaging and K Polarimetry of the Bipolar Outflow NGC 2071 JHKL Imaging and K Polarimetry of the Bipolar Outflow NGC 2071

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...418..310w&link_type=abstract

Astrophysical Journal v.418, p.310

Astronomy and Astrophysics

Astronomy

26

Infrared: Interstellar: Continuum, Ism: Individual Ngc Number: Ngc 2071, Ism: Jets And Outflows, Polarization

Scientific paper

We present a 5' × 9' K band image of the region surrounding NGC 2071IR, showing its complex and diverse morphology. We also present the first J, H, K, and NBL high spatial resolution images of the core, along with the first high-resolution K band imaging polarimetry. The data show that IRS 5 has changed in morphology and has gotten fainter over the last four years. An extension to the southeast of IRS 5, which we call IRS 5a, first appeared in the 1991 images. We suspect IRS 5 is a peak of molecular hydrogen emission due to a jet from IRS 1, which over the past few years has shifted its orientation and is now exciting molecular material at the IRS 5a position. In addition we present an alternative model, in which the jet originates from IRS 8.
The polarimetry shows IRS 1 and IRS 3 are highly polarized, while IRS 2, IRS 4 and IRS 6 are stellar objects showing low polarization. We suggest that IRS 2 is a star located behind the bipolar outflow driven by IRS 1, while IRS 4 and IRS 6 are background stars. IRS 1 and IRS 8 appear to illuminate sections of the nebulosity, both creating regions of centro-symmetric vectors. Most of the highly polarized nebulosity to the east of IRS 1 is believed to be due to scattered υ = 1-0 S(1), H2 emission.
In conclusion, we consider IRS 7 and IRS 51 to be driving smaller outflows, and together with IRS 1, which is driving the large-scale CO outflow, conspire to give the appearance of one massive bipolar outflow. IRS 8 may also be an active young star contributing to the complexity of the region.

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