Infrared Imaging Polarimetry of Cepheus A: The Source of the Infrared Reflection Nebula

Details Infrared Imaging Polarimetry of Cepheus A: The Source of the Infrared Reflection Nebula Infrared Imaging Polarimetry of Cepheus A: The Source of the Infrared Reflection Nebula

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...462..797c&link_type=abstract

Astrophysical Journal v.462, p.797

Astronomy and Astrophysics

Astronomy

11

Infrared: Ism: Continuum, Ism: Individual Name: Cepheus A, Polarization, Ism: Reflection Nebulae

Scientific paper

Deep 1-2.5 μm (JHK) images and linear polarization observations of the infrared reflection nebula in Cepheus A have been obtained using a two-channel infrared camera/polarimeter system with 0".675 per pixel and a field of view of almost 3' to determine the location of the illuminating source that is completely hidden by extinction. Approximately 1000 independent polarization vectors are used to locate the center of light to an accuracy of 1"5 (3 σ) at J, H, and K'. The polarization pattern is complex, well resolved, and exhibits many features characteristic of multiple scattering models in a dusty nebula with an evacuated, bipolar cavity. For this reason, fitting all the polarization vectors to a centrosymmetric pattern is shown to be flawed and can actually cause errors in positional estimates. Careful analysis shows that the illuminating source is essentially the same at J, H, and K' and that it is clearly coincident within 3 σ errors with the compact radio source HW-2 observed at 6 cm, but yet it is apparently displaced 5" south of the far-IR source detected at 20 μm.

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