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Durham e-Theses
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An investigation of the active galaxies M82 and NGC 5128

Foley, Neasa (1995) An investigation of the active galaxies M82 and NGC 5128. Doctoral thesis, Durham University.



In this thesis we present multi-waveband imaging polarimetry and spectropolarime- try of the starburst galaxy M82 and multi-waveband imaging polarimetry of the active galaxy NGC 5128. A review of previous studies of these galaxies is given. The imaging polarimetry of M82 in broadband filters reveals a polarization pattern that is due to scattering of light from the galactic disk and a nuclear starburst component. The Hq filter polarimetry shows a centrosymmetric pattern from the nuclear component only. The spectropolarimetry of the southern filaments of M82 shows evidence for a mixture of scattering and intrinsic emission from the walls of a superwind blown cavity. Only the Hɑ systemic component of M82 is seen in polarized intensity, the blueshifted component is due to intrinsic emission only. NGC 5128 displays a polarization pattern in its dust lane which is produced by extinction due to aligned non-spherical dust grains in a magnetic field. The wavelength dependence of the polarization in the dust lane is found to follow a Serkowski curve in the central regions.

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Thesis Date:1995
Copyright:Copyright of this thesis is held by the author
Deposited On:24 Oct 2012 15:11

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