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A Seyfert Nucleus in BL Lacertae
(Astronomical Society of the Pacific, 1999)
We have obtained spectroscopic observations of the broad Ha line in BL Lacertae over a period of 30 months. These data show that the line equivalent width is anti-correlated with the continuum flux implying that the broad ...
Optical Spectropolarimetry of Broad Line Active Galaxies
(Astronomical Society of the Pacific, 1999)
We present new optical spectropolarimetry of two bright type 1 AGNs. The observations are part of a project on broad line active galaxies in which, through data analysis and modelling, we aim to identify the polarization ...
Monitoring the Ha Line in BL Lacertae - Evidence for an Accretion Disk
(Astronomical Society of the Pacific, 1999)
We present new spectroscopic observations of the recently discovered broad Ha line in BL Lacertae. These data, obtained over a period of 30 months, indicate that the line equivalent width is anti-correlated with the continuum ...
A time-variable scattered component to broad Hα in the Seyfert 1 galaxy Mrk 509
(1999)
We present optical spectropolarimetry data for the Seyfert 1 galaxy Mrk 509 for three epochs: 1996 August and 1997 May and August. We confirm previous findings that broad Hα has a significantly greater width in the polarized ...
The profiles of polarized broad Hα lines in radio galaxies
(1998)
We present spectropolarimetric observations of seven broad-line radio galaxies. We find significantly polarized broad Hα emission in four objects including two, Arp 102B and 3C 390.3, which have double-peaked line profiles. ...
The appearance of broad H alpha in BL Lacertae
(1996)
We present optical spectropolarimetry confirming Vermeulen et al.'s recent discovery of a broad Hα emission line in BL Lacertae. This feature, which is present at about the same strength in spectra taken two days apart, ...
Powering the Broad H alpha Line in BL Lacertae
(Astronomical Society of the Pacific, 1996)