Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Leo II Group: decoupled cores of NGC 3607 and NGC 3608   The kinematics, structure, and stellar population properties in the centers
of two brightest early-type galaxies of the Leo II group, NGC 3607 and NGC
3608, are studied by means of integral-field spectroscopy. The kinematically
distinct areas in the centers of these galaxies, with radii of 6" and 5"
respectively, are found also to be chemically distinct. These stellar
structures are characterized by enhanced magnesium-line strength in the
integrated spectra. However, we have not found any mean stellar age differences
between the decoupled cores and their outskirts. Analysis of the
two-dimensional line-of-sight velocity fields reveals systematic turns of the
kinematical major axes near the nuclei of both galaxies; in NGC 3608 the
ionized gas rotates in the orthogonal plane with respect to the stellar
component rotation. By taking into account some morphological features, we
conclude that both NGC 3607 and NGC 3608 have large triaxial stellar spheroids.
We argue that the magnesium-enhanced cores are not circumnuclear disks; instead
they resemble rather compact triaxial structures which may be a cause of
formation of polar disks around them - a gaseous one in NGC 3608 and a
stellar-gaseous one in NGC 3607. In the latter galaxy the star formation is
perhaps still proceeding over the polar disk.

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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph