Spectroscopic study of the peculiar galaxy UGC 5119 |
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Authors: | O A Merkulova L V Shalyapina V A Yakovleva G M Karataeva |
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Institution: | (1) Sobolev Astronomical Institute, St. Petersburg State University, Universitetskii pr. 28, St. Petersburg, Peterhof, 198904, Russia |
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Abstract: | 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 Hβ, Mggb, 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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Keywords: | galaxies elliptical galaxies galaxy interaction stellar kinematics stellar population metallicity age |
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