Stellar population of the central regions of NGC 5128

Details Stellar population of the central regions of NGC 5128 Stellar population of the central regions of NGC 5128

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006astl...32..236k&link_type=abstract

Astronomy Letters, vol. 32, Issue 4, p.236-243

Astronomy and Astrophysics

Astronomy

2

Pacs Numbers 98.54.Cm - 98.62.Ai - 98.62.Lv

Scientific paper

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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