Blue spectropolarimetry of Seyfert 2 galaxies. 1: Analysis and basic results

Details Blue spectropolarimetry of Seyfert 2 galaxies. 1: Analysis and basic results Blue spectropolarimetry of Seyfert 2 galaxies. 1: Analysis and basic results

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..196k&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 430, no. 1, p. 196-209

Astronomy and Astrophysics

Astrophysics

77

Astronomical Polarimetry, Galactic Radiation, Polarized Radiation, Seyfert Galaxies, Astronomical Models, Polarization (Waves)

Scientific paper

Spectropolarimetry in the 3200-6200 A range was obtained on 50 Seyert 2 galaxies. After careful subtraction of a template galaxy, the fractions of the total flux due to starlight Fg and to the featureless continuum Fc were estimated. All of the Seyfert 2 galaxies have a nonstellar component to their spectrum. Polarization is not correlted with Fc which argues against the hypothesis that all Seyfert 2s have highly polarized featureless continua which are unseen because of dilution by starlight. The nine Seyfert 2s with spectropolarimetrically identified hidden broad-line regions (BLRs) have the mean value of Fg = 0.30 considerably less than the average of 0.70 found for the larger sample. This suggests that the spectropolarimetric method of identifying hidden BLRs in Seyfert 2s is most sensitive to objects in which the polarization is less contaminated by a large fraction of starlight. The spectopolarimetric data indicates a few additional objects, Mrk 266SW and Mrk 573, which may contain hidden BLRs, but they require further study at H-alpha.

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