The stellar population study of the polar rings in the galaxies NGC 2685 and NGC 4650A

Details The stellar population study of the polar rings in the galaxies NGC 2685 and NGC 4650A The stellar population study of the polar rings in the galaxies NGC 2685 and NGC 4650A

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003rmxac..17..102k&link_type=abstract

Galaxy Evolution: Theory & Observations (Eds. Vladimir Avila-Reese, Claudio Firmani, Carlos S. Frenk & Christine Allen) Revista

Astronomy and Astrophysics

Astronomy

Ngc 2685, Ngc 4650A, Polar Ring Galaxies, Stars: Population

Scientific paper

Polar ring galaxies (PRGs) are dynamically peculiar systems with a ring or annulus of gas, stars and dust orbiting in a plane nearly perpendicular to the equatorial plane of the host galaxy (Withmore 1990). According to the most popular point of view, PRGs are the result of galaxy interaction, which ranges from simple gas accretion to a complete merger. Alternatively, polar rings can represent the delayed inflows of primordial gas. Therefore, the problem of PR's age is actual (Eskridge & Podge 1997; Gallagher et al 2002). Deep single-star photometry can directly identify stars in various evolutionary phases through their positions on CMD. This can cast light on the origin and evolution of PRGs.

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