Polar Ring Galaxies and the Tully-Fisher relation

Details Polar Ring Galaxies and the Tully-Fisher relation Polar Ring Galaxies and the Tully-Fisher relation

2003-10-06

arxiv.org/abs/astro-ph/0310139v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings for IAU Symp. 220 "Dark Matter in Galaxies", ASP, Eds: S. Ryder, D.J. Pisano, M. Walker, K.C. Fre

Scientific paper

We have investigated the Tully-Fisher relation for Polar Ring Galaxies (PRGs), based on near infrared, optical and HI data available for a sample of these peculiar objects. Many PRGs show larger HI line-widths than expected for the observed K band luminosity, and this result is confirmed by a larger sample of objects, based on B-band data. This observational evidence may be related to the dark halo shape and orientation in these systems: the larger rotation velocities observed in PRGs can be explained by a flattened polar halo, aligned with the polar ring.

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