Spectroscopic study of the peculiar galaxy UGC 5119

Details Spectroscopic study of the peculiar galaxy UGC 5119 Spectroscopic study of the peculiar galaxy UGC 5119

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008astl...34..542m&link_type=abstract

Astronomy Letters, Volume 34, Issue 8, pp.542-550

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present the results of our study of the stellar kinematics in the elliptical galaxy UGC 5119, which has previously been suspected to be a polar-ring galaxy. We have detected a rapidly rotating disk in the central region ( r ≤ 3.2 kpc) of the galaxy’s main body and found a radial velocity gradient along its minor axis (in the putative ring). We conclude that UGC 5119 is a medium-luminosity elliptical galaxy with a rapidly rotating disk component and a stellar (probably polar) ring. We have calculated the Lick indices of the H β, Mgg b, Fe 5270, and Fe 5335 absorption lines and compared them with evolutionary synthesis models. Differences in the [Mg/Fe] ratios, metallicities, and ages of the stars have been found: the young stellar population with a solar [Mg/Fe] ratio and a high metallicity dominates in the circumnuclear region ( r ≤ 1 kpc), while the old one with a low metal abundance dominates in the ring.

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