Stellar population of the central regions of NGC 5128 |
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Authors: | G M Karataeva N A Tikhonov O A Galazutdinova V A Hagen-Thorn |
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Institution: | (1) Astronomical Institute, St. Petersburg State University, Universitetskiĭ pr. 28, Petrodvorets, 198504, Russia;(2) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhniĭ Arkhyz, 357147, Karachaĭ-Cherkessian Republic, Russia |
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Abstract: | We present the results of stellar photometry in eight fields of NGC 5128 (Cen A), a candidate polar-ring galaxy, obtained by reducing images from the Hubble Space Telescope archive. In all cases, the color-magnitude diagrams reached the red-giant region, and the distance to the galaxy was determined from the position of the tip of the red-giant branch (4.1 Mpc), in agreement with previous estimates. Comparison of the diagrams with theoretical isochrones indicates that the red supergiants in the dark lane region are metal-rich, which is atypical of the polar rings. Our results are consistent with the assumption made by several authors that the absorption of a less massive spiral galaxy by a more massive one is observed in NGC 5128. |
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