Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-23
Astronomy and Astrophysics
Astrophysics
5 pages, including 3 postscript figures. Uses emulateapj. Accepted for publication in ApJ Letters
Scientific paper
10.1086/522697
We have discovered an extremely broad, double-peaked H-alpha emission line in the polarized flux spectrum of NGC 2110, establishing that this well-studied Seyfert 2 galaxy contains a disk-like hidden broad-line region (BLR). Several properties of NGC 2110 suggest that it is an obscured twin of Arp 102B, the prototypical double-peaked emission-line active galactic nucleus (AGN). A comparison between our data and previous spectra of NGC 2110 indicates that the double-peaked H-alpha feature is transient. The presence of a disk-like BLR in NGC 2110 has important implications for AGNs: it expands the range of properties exhibited by Seyfert 2 galaxies, and the fact that the BLR is obscured by a torus-like structure provides the first evidence that double-peaked emitters and classical Seyfert nuclei may have the same basic parsec-scale geometry.
Barth Aaron J.
Eracleous Michael
Kay Laura E.
Moran Edward C.
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