Search

Now showing items 1-8 of 8

The magnetic field structure of the DR21 region

Itoh, Y.; Chrysostomou, A.; Burton, M.; Hough, J.; Tamura, M. (1999)

We present results of imaging polarimetry of the H2 v=1--0 S(1) line towards the outflow lobes of DR21. The polarization vectors are produced by dichroic absorption in a medium of aligned grains and therefore delineate the ...

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 ...

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 ...

Polarized broad HeI and Paschen lines in NGC 1068

Alexander, D.M.; Young, S.; Hough, J. (1999)

We present J-band spectropolarimetry of NGC 1068. We observe polarized broad Pa β and, for the first time, polarized broad Pa γ and HeI. Assuming electron scattering as the polarization mechanism, the polarized broad lines ...

Observations and a model for the infrared continuum of Centaurus A

Alexander, D.M.; Efstathiou, A.; Hough, J.; Aitken, D.; Lutz, D.; Roche, P.F.; Sturm, E. (1999)

We present ISOPHOT S, ISOSWS and 8 to 13 mi- cron ground based observations of Centaurus A that show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We ...

Searching for the hidden broad-line region in Centaurus A

Alexander, D.M.; Hough, J.; Young, S.; Bailey, J.; Heisler, C.A.; Lumsden, S.; Robinson, A. (1999)

We present the first near-infrared (K-band) spectropolarimetric observations of the nuclear region of Centaurus A. Although the data are of high signal-to-noise ratio, polarized broad Brγ is not detected and we place a 3σ ...

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 time-variable scattered component to broad Hα in the Seyfert 1 galaxy Mrk 509

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