Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543307t&link_type=abstract
American Astronomical Society, AAS Meeting #215, #433.07; Bulletin of the American Astronomical Society, Vol. 42, p.371
Other
Scientific paper
We present the detection of extremely broad, double-peaked, highly polarized Hα emission lines in the nuclei of the well-known Seyfert 2 galaxies NGC 2110 and NGC 5252. These hidden broad Hα emission lines, visible only in scattered light, are shown to display significant variability in strength and profile on timescales of ≤ 1 year. That the broad emission line exhibits variability in polarized flux also suggests that the scattering region must be very compact, possibly confined in a small number of electron clouds ≤ 1 ly in size. Our observational contraints place these clouds within 10 pc of the nucleus with electron temperatures 106 K and densities 107 cm-3, consistent with a region just outside the obscuring torus between the broad-line region and narrow-line region. These scattering clouds could arise from the clumpy torus itself. These findings and other properties indicate that NGC 2110 and NGC 5252 are the hidden counterparts to the broad-line double-peaked emission-line AGNs.
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