Browsing by Author "Corbett, E.A."

The appearance of broad H alpha in BL Lacertae

Corbett, E.A.; Robinson, A.; Axon, D.J.; Hough, J.; Jeffries, R.D.; Thurston, M.R.; Young, S. (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, ...

Equatorial scattering and the structure of the broad-line region in Seyfert nuclei: evidence for a rotating disc

Smith, J.E.; Robinson, A.; Young, S.; Axon, D.J.; Corbett, E.A. (2005)

We present detailed scattering models confirming that distinctive variations in polarization across the broad Hα line, which are observed in a significant fraction of type 1 Seyfert galaxies, can be understood in terms of ...

Monitoring the Ha Line in BL Lacertae - Evidence for an Accretion Disk

Corbett, E.A.; Robinson, A.; Hough, J.; Axon, D.J. (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 ...

Optical Spectropolarimetry of Broad Line Active Galaxies

Giannuzzo, M.E.; Corbett, E.A.; Robinson, A.; Young, S.; Hough, J.; Axon, D.J. (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 ...

Powering the Broad H alpha Line in BL Lacertae

Corbett, E.A.; Robinson, A.; Hough, J.; Young, S.; Axon, D.J. (Astronomical Society of the Pacific, 1996)

The profiles of polarized broad Hα lines in radio galaxies

Corbett, E.A.; Robinson, A.; Axon, D.J.; Young, S.; Hough, J. (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. ...

A Seyfert Nucleus in BL Lacertae

Axon, D.J.; Corbett, E.A.; Robinson, A.; Hough, J. (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 ...

A Seyfert-like nucleus concealed in BL Lacertae?

Corbett, E.A.; Robinson, A.; Axon, D.J.; Hough, J. (2000)

We present a series of new spectroscopic observations of BL Lacertae. The observations were obtained over a period of 30 months and sample the violent continuum flare of 1997 June–August. The equivalent width of the recently ...