Synchronous evolution of galaxies in groups: NGC524 group |
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| Authors: | O K Sil’chenko V L Afanasiev |
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| Institution: | 1.Sternberg State Astronomical Institute,Moscow State University,Moscow,Russia;2.Special Astrophysical Observatory,Russian Academy of Sciences,Nizhnii Arkhyz,Russia |
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| Abstract: | With the means of panoramic spectroscopy at the SAO RAS BTA telescope, we investigated the properties of stellar populations
in the central regions of five early-type galaxies—the NGC524 group members. The evolution of the central regions of galaxies
looks synchronized: the average age of stars in the bulges of all the five galaxies lies in the range of 3–6Gyr.Four of the
five galaxies revealed synchronized bursts of star formation in the nuclei 1–2 Gyr ago. The only galaxy, in which the ages
of stellar population in the nucleus and in the bulge coincide (i.e. the nuclear burst of star formation did not take place)
isNGC502, the farthest from the center of the group of all the galaxies studied. |
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