Spectropolarimetry of PHL 5200

Details Spectropolarimetry of PHL 5200 Spectropolarimetry of PHL 5200

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..404s&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 15, 1981, p. 404-410.

Other

28

Linear Polarization, Optical Polarization, Polarimetry, Quasars, Astronomical Spectroscopy, Emission Spectra, Infrared Spectra

Scientific paper

It is noted that of the 17 known QSOs with high optical linear polarization, only PHL 5200, which is well known for its unique P Cygni-like spectrum, is radio quiet. In addition, while the others resemble BL Lac objects in their violently variable polarization and flux, the spectrum and polarization of PHL 5200 have not been observed to vary over many years. In order to discover the origin of its polarization, moderate resolution spectropolarimetry of PHL 5200 is obtained between wavelengths of 3900 and 7100 A (1310-2390 A in the rest frame, z = 1.98) and in a near infrared band of 7150-8600 A (2400-2886 A in the rest frame). It is shown that the polarization arises in the continuum and increases toward shorter wavelength. The emission lines do not appear to be polarized, which indicates that the polarization originates within the line-emission model region.

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