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Article Dans Une Revue The Astrophysical Journal Année : 2003

Polar Ring Galaxies and the Tully-Fisher Relation: Implications for the Dark Halo Shape

Résumé

We have investigated the Tully-Fisher relation for polar ring galaxies (PRGs), based on near-infrared, optical, and H I data available for a sample of these peculiar objects. The total K-band luminosity, which mainly comes from the central host galaxy, and the measured H I line width at 20% of the peak line flux density, which traces the potential in the polar plane, place most polar rings in the sample far from the Tully-Fisher relation defined for spiral galaxies, with many PRGs showing larger H I line widths than expected for the observed K-band luminosity. 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, which we study by numerical modeling of PRG formation and dynamics: the larger rotation velocities observed in PRGs can be explained by a flattened polar halo, aligned with the polar ring.

Dates et versions

hal-03732456 , version 1 (21-07-2022)

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Citer

E. Iodice, M. Arnaboldi, Frédéric Bournaud, Françoise Combes, Linda S. Sparke, et al.. Polar Ring Galaxies and the Tully-Fisher Relation: Implications for the Dark Halo Shape. The Astrophysical Journal, 2003, 585, pp.730-738. ⟨10.1086/346107⟩. ⟨hal-03732456⟩
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