Integrated Optical Polarization of Nearby Galaxies

Details Integrated Optical Polarization of Nearby Galaxies Integrated Optical Polarization of Nearby Galaxies

2012-01-11

arxiv.org/abs/1201.2413v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

accepted in ApJ, 21 pages, 5 figures

Scientific paper

We performed an integrated optical polarization survey of 70 nearby galaxies to study the relationship between linear polarization and galaxy properties. To date this is the largest survey of its kind. The data were collected at McDonald Observatory using the Imaging Grism Polarimeter on the Otto Struve 2.1m telescope. Most of the galaxies did not have significant level of linear polarization, where the bulk is <1%. A fraction of the galaxies showed a loose correlation between the polarization and position angle of the galaxy, indicating that dust scattering is the main source of optical polarization. The unbarred spiral galaxies are consistent with the predicted relationship with inclination from scattering models of ~sin^2i.

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