Near-infrared imaging polarimetry of bipolar nebulae. II - GL 2591

Details Near-infrared imaging polarimetry of bipolar nebulae. II - GL 2591 Near-infrared imaging polarimetry of bipolar nebulae. II - GL 2591

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..508m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, Aug. 1, 1991, p. 508-521.

Astronomy and Astrophysics

Astronomy

36

Astronomical Polarimetry, Infrared Sources (Astronomy), Reflection Nebulae, Bipolarity, Early Stars, Imaging Techniques, Near Infrared Radiation

Scientific paper

High spatial resolution near-IR polarization and surface brightness images of the reflection nebulosity GL 2591 are presented. The J, H and K surface brightness images reveal two non-concentric loops of nebulosity aligned with the high-velocity, blueshifted outflow from GL 2591 IRS. The polarization vector maps show a centro-symmetric pattern centred on GL 2591 IRS, indicating that it is illuminating a near-IR reflection nebula. Evidence is presented that implies GL 2591 IRS is surrounded by a dense disc or toroid of material. The observed increase in polarization with wavelength for the reflection nebulosity is interpreted as evidence for the presence of grains with a size distribution larger than that found in the diffuse ISM. Models giving the spatial dependence of linear polarization of scattered light for various scattering geometries are presented. A model for the blueshifted outflow, in which the two loops of nebulosity are the result of two discrete mass outbursts from gl 2591 IRS, is presented.

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