Issue |
A&A
Volume 446, Number 3, February II 2006
|
|
---|---|---|
Page(s) | 847 - 854 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20053993 | |
Published online | 20 January 2006 |
Internal kinematics of isolated modelled disc galaxies
1
Institut für Astrophysik, Leopold-Franzens-Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria e-mail: wolfgang.e.kapferer@uibk.ac.at
2
Institut für Astrophysik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Received:
5
August
2005
Accepted:
12
September
2005
We present a systematic investigation of rotation curves
(RCs) of fully hydrodynamically simulated galaxies, including
cooling, star formation with associated feedback, and galactic
winds. Applying two commonly used fitting formulae to characterize
the RCs, we investigated systematic effects on the shape of RCs
by both the observational constraints and internal properties of the
galaxies. We mainly focused on effects that occur in measurements of
intermediate and high redshift galaxies. We found that RC
parameters are affected by the observational setup, like slit
misalignment or the spatial resolution and that they also depend on the
evolution of a galaxy. Therefore, a direct comparison of
quantities derived from measured RCs with predictions of
semi-analytic models is difficult. The virial velocity
, which is usually calculated and used by
semi-analytic models, can differ significantly from fit parameters
like
or
inferred from RCs. We found
that
is usually lower than typical characteristic
velocities derived from RCs.
alone is in general
not a robust estimator of the virial mass.
Key words: galaxies: kinematics and dynamics / galaxies: spiral / galaxies: structure
© ESO, 2006
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