Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001astl...27...15s&link_type=abstract
Astronomy Letters, vol. 27, p. 15-24 (2001)
Astronomy and Astrophysics
Astronomy
1
Lenticular Galaxies, Circumnuclear Stellar Disks
Scientific paper
We present the results of a comprehensive spectrophotometric study of the central region in the regular lenticular galaxy NGC4036 with two spectrographs of the 6-m telescope. The unresolved nucleus of NGC4036 is shown to be chemically decoupled: [Mg/Fe] = +0.3 at the very center, whereas in the immediate vicinity of its nucleus, this ratio abruptly drops to +0.1 and does not change further along the radius. A study of isophotal morphology in combination with a kinematic analysis has proven that the rotation of stars at the NGC4036 center is axisymmetric. However, the major-axis turn within R < 5" should be considered real. We interpret this turn as evidence for the existence of a tilted circumnuclear stellar disk with a radius of ~250 pc in NGC4036. The NGC4036 bulge may be triaxial, and the ionized gas at the galactic center is then concentrated toward the principal plane of the ellipsoidal potential.
Sil'chenko Olga K.
Vlasyuk V. V.
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