The chemically distinct nucleus and structure of the SO galaxy NGC 80статья

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[1] The chemically distinct nucleus and structure of the so galaxy ngc 80 / O. K. Sil’chenko, S. E. Koposov, V. V. Vlasyuk, O. I. Spiridonova // Astronomy Reports. — 2003. — Vol. 47, no. 2. — P. 88–98. The giant lerniculargalaxy NGC 80, which is the brightest member of a rich group, possesses a central evolutionarily-distinct region: the stars in the nucleus and in a circumnuclear ring of radius 5”t-7” have a mean age of only 7 Gyr, whereas the stellar population of the bulge is older than 10 Gyr. The nucleus of NGC 80 is also chemically distinct: it is a factor of 2-2.5 richer in metals than its immediate neighborhood and is characterized by a high magnesium-to-iron abundance ratio [Mg/Fe] approximate to + 0.3. The global stellar disk of NGC 80 has a two-tiered structure: its outer part has an exponential scale length of 11 kpc and normal Surface density, while the inner disk, which is also exponential arid axisymmetric, is more compact and brighter. Although the two-tiered structure an(] the chemically distinct nucleus obviously have a common origin and owe their existence to some catastrophic restructuring of the protogalactic gaseous disk, the origin of this remains unclear, since the galaxy lacks any manifestations of perturbed morphology or triaxiality. (C) 2003MAIK”Nauka/lnterperiodica”. [ DOI ]

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