Near-infrared imaging polarimetry of CygnusA

Details Near-infrared imaging polarimetry of CygnusA Near-infrared imaging polarimetry of CygnusA

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.297..936p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 3, pp. 936-942.

Astronomy and Astrophysics

Astronomy

6

Polarization, Methods: Observational, Techniques: Polarimetric, Galaxies: Individual: Cygnusa, Galaxies: Nuclei, Infrared: Galaxies

Scientific paper

We present a 2.2-μm polarization image of the nuclear regions of CygnusA. The degree of polarization in the central 1 arcsec is (4.1+/-0.50) per cent, at a position angle of (23.6+/-3.6) deg, approximately perpendicular to the axis of the radio jet. Modelling of the results suggests that at this wavelength the polarization along the line of sight to the central source is most likely produced by dichroism, through an A_v~40 mag, with the polarization in surrounding regions produced by scattering. For this model, the K-band luminosity of the central source is calculated to be ~2x10^44 erg s^-1.

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