Polarimetric mapping of a new infrared reflection nebula GGD 27 IRS

Details Polarimetric mapping of a new infrared reflection nebula GGD 27 IRS Polarimetric mapping of a new infrared reflection nebula GGD 27 IRS

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177..258y&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. 258-264. SERC-MOESC-supported research.

Astronomy and Astrophysics

Astronomy

47

Astronomical Maps, Infrared Astronomy, Polarimetry, Reflection Nebulae, Brightness, Disks (Shapes), Energy Spectra, Infrared Reflection, Near Infrared Radiation

Scientific paper

The authors report the discovery of an infrared reflection nebula GGD 27 IRS, near the optical nebulosity GGD 27. It shows a dumbbell-shaped structure with large degrees of polarization, up to 64%, in the K band. From the centrosymmetric pattern of the polarization vectors the authors identify the illuminating source of the nebula with IRS 2. A simple model based on single Rayleigh scattering at the surface of a paraboloidal shell gives good agreement with the observed radial dependence of both polarization and surface brightness. This model is in good agreement with the recently revealed shell structure of the CO bipolar flow. Small polarization and low surface brightness both east and west of IRS 2 indicate the presence of a disk of obscuring material elongated orthogonal to the extent of the nebula. The authors estimate the size, extinction, and mass of the disk to be 40arcsec×60arcsec, 75 mag and 200 M_sun;, respectively.

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