The broad line region and dust torus structure of the Seyfert 1 WPVS48
2018
Optical and near-mid-infrared
reverberation mappingdata obtained at Universit\"{a}tssternwarte Bochum in Chile and with the
Spitzer Space Telescopeallow us to explore the geometry of both the
H$\
alpha$ BLR and the dust torus for the nearby Seyfert-1 galaxy WPVS\,48. On average, the
H$\
alpha$ variations lag the blue AGN continuum by about 18 days, while the dust emission variations lag by 70 days in the J+K and by 90 days in the L+M bands. The IR echoes are sharp, while the
H$\
alpha$ echo is smeared. This together favours a bowl shaped toroidal geometry where the dust sublimation radius is defined by a bowl surface, which is virtually aligned with a single iso-delay surface, thus leading to the sharp IR echoes. The BLR clouds, however, are located inside the bowl and spread over a range of iso-delay surfaces, leading to a smeared echo.
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