The infrared polarization of NGC 1275, NGC 4151, Markarian 231, and 3C 273

Details The infrared polarization of NGC 1275, NGC 4151, Markarian 231, and 3C 273 The infrared polarization of NGC 1275, NGC 4151, Markarian 231, and 3C 273

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215l.107k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 215, Aug. 1, 1977, p. L107-L110. NSF-supported research.

Astronomy and Astrophysics

Astronomy

47

Infrared Radiation, Polarization Characteristics, Quasars, Seyfert Galaxies, Infrared Astronomy, Light Modulation, Optical Polarization, Photoelasticity, Polarimetry

Scientific paper

The letter reports initial observations obtained with an infrared polarimeter employing photoelastic modulators. Operable over the range from 1 to 8 microns, it has vanishing instrumental polarization, no more than about 0.03% as verified so far. The common and surprising feature of the four objects studied is the very small polarization at 2.2 microns, namely: (0.33 + or - 0.14)% in 3C 273, (0.13 + or - 0.06)% in NGC 4151, (0.55 + or - 0.11)% in Markarian 231, and (0.52 + or - 0.20)% in NGC 1275. These contrast with the large infrared polarizations in, for example, BL Lacertae objects. At least in NGC 4151, if the radiation mechanism is nonthermal it must be of an unpolarized type.

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