| Issue |
A&A
Volume 388, Number 2, June III 2002
|
|
|---|---|---|
| Page(s) | 461 - 469 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20020571 | |
| Published online | 31 May 2002 | |
A lopsided chemically distinct nucleus in NGC 5055*
1
Special Astrophysical Observatory, Nizhnij Arkhyz, 369167 Russia
2
Sternberg Astronomical Institute, University Av. 13, Moscow 119992, Russia
3
Isaac Newton Institute of Chile, Moscow Branch
Corresponding author: O. K. Sil'chenko, olga@sai.msu.su
Received:
23
November
2001
Accepted:
12
April
2002
Kinematics and stellar population properties in the
center of nearby Sbc galaxy NGC 5055 are studied with the
Multi-Pupil Spectrograph of the 6 m telescope of the Special
Astrophysical Observatory of Russian Academy of Sciences (SAO
RAS). We confirm the rotation and stellar velocity dispersion
asymmetries along the major axis reported earlier by other
authors. We have found a resolved chemically distinct core in
NGC 5055, with the magnesium-enhanced region shifted by 
(100 pc) to the south-west from a photometric center, toward a
kinematically identified circumnuclear stellar disk. Mean ages of
stellar populations in the true nucleus, defined as the
photometric center, and in the magnesium-enhanced substructure are
coincident and equal to 3–4 Gyr being younger by several Gyr with
respect to the bulge stellar population. A possible origin of the
asymmetries in the center of NGC 5055 is discussed.
Key words: galaxies: individual: NGC 5055 / galaxies: nuclei / galaxies: stellar content / galaxies: kinematics and dynamics / galaxies: evolution
© ESO, 2002
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