Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..393m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 15, 1987, p. 393-398. MOESC-supported resear
Astronomy and Astrophysics
Astronomy
16
Infrared Radiation, Reflection Nebulae, Cosmic Dust, Linear Polarization, Polarized Electromagnetic Radiation, Protostars
Scientific paper
An extensive, low surface brightness reflection nebula has been discovered around S106 by mapping the infrared polarization at 2.2 μm. Polarized flux is detected to almost 3 arcmin from the central source (IRS4), well beyond the main part of the optical H II nebula. The pattern of polarization vectors is centro-symmetric about the embedded object and is a characteristic of a reflection nebula. Polarizations as large as 25 per cent are observed, with the remarkable result that there is no obvious anomaly in the distribution of 2.2 μm polarization corresponding to the optical bipolar morphology. This difference can be explained by a simple model involving a compact dust disc near the embedded star. The authors also discuss the implications of this detection as an important new tracer of the extent of dust, and for the significant role that scattering from grains may play in protostellar clouds and obscured bipolar flows.
Aspin Colin
Axon Dave
Burton Michael G.
Garden Ron
Gatley Ian
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