[*] Photometric disk-bulge decomposition, line profile analysis, and dynamical modeling of the elliptical galaxy NGC 2974

Cinzano P., van der Marel R.P.

in `Structure, dynamics, and chemical evolution of elliptical galaxies', Danziger I.J., Zeilinger W.W., Kjar K., eds., ESO, Garching, Germany, p. 105-114, 1993

© 1993. European Southern Observatory. All Rights Reserved.

• Paper (.ps 120 kb) (.ps.gz 34 kb)

We present kinematical data and a line profile shape analysis for the major and the minor axis of NGC 2974. On the major axis, as would be expected if a disk is present, the line profiles are very asymmetric away from the center, with the asymmetry changing sign upon going from one side of the nucleus to the other.

Dynamical models are constructed that take account of the presence of an exponential disk in the equatorial plane of the galaxy. The Jeans equations are solved to predict the rotation velocities and velocity dispersions of both the spheroid and the disk. Line profile shapes are predicted assuming that both the spheroid and the disk have a Gaussian line profile. Models are constructed that provide an acceptable fit to all the available photometrical and kinematical data, including the line profiles. In these models the disk contributes 5-10% of the total light of the galaxy. The derived inclination of the disk is consistent with observations of neutral and ionized gas in this galaxy. Models without a disk cannot fit the data.

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Last modified December 8, 1998.
Roeland van der Marel, marel@stsci.edu.
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