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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 198335.0, MPI für Astronomie / Publikationen_mpia
The Tully-Fisher Relation of barred galaxies
Authors:Courteau, Stéphane; Andersen, David R.; Bershady, Matthew A.; MacArthur, Lauren A.; Rix, Hans-Walter
Date of Publication (YYYY-MM-DD):2003
Title of Journal:The Astrophysical Journal
Journal Abbrev.:The Astrophysical Journal
Start Page:208
End Page:224
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present new data exploring the scaling
relations, such as the Tully-Fisher relation
(TFR), of bright barred and unbarred galaxies. A
primary motivation for this study is to establish
whether barredness correlates with, and is a
consequence of, virial properties of galaxies.
Various lines of evidence suggest that dark
matter is dominant in disks of bright unbarred
galaxies at 2.2 disk scale lengths, the point of
peak rotation for a pure exponential disk. We
test the hypothesis that the Tully-Fisher (TF)
plane of barred high surface brightness galaxies
is offset from the mean TFR of unbarred
galaxies, as might be expected if barred
galaxies are ``maximal'' in their inner parts. We
use existing and new TF data to search for basic
structural differences between barred and
unbarred galaxies. Our new data consist of
two-dimensional H alpha; velocity fields
derived from SparsePak integral field
spectroscopy and V- and I-band CCD images
collected at the WIYN Observatory<FNOTEREF
RID=&quot;fn2&quot;>2</FNOTEREF> for 14 strongly barred
galaxies. Differences may exist between kinematic
and photometric inclination angles of barred
versus unbarred galaxies. These findings lead us
to restrict our analysis to barred galaxies with
i gt;50deg. We use WIYN/SparsePak
(two-dimensional) velocity fields to show that
long-slit (one-dimensional) spectra yield
reliable circular speed measurements at or
beyond 2.2 disk scale lengths, far from any
influence of the bar. This enables us to consider
line width measurements from extensive TF
surveys that include barred and nonbarred disks
and derive detailed scaling relation comparisons.
We find that for a given luminosity, barred and
unbarred galaxies have comparable structural and
dynamical parameters, such as peak velocities,
scale lengths, and colors. In particular, the
location of a galaxy in the TF plane is
independent of barredness. In a global dynamical
sense, barred and unbarred galaxies behave
similarly and are likely to have, on average,
comparable fractions of luminous and dark matter
at a given radius.
Free Keywords:Galaxies: Formation; Galaxies: Kinematics and
; Dynamics; Galaxies: Photometry; Galaxies:
; Spiral; Galaxies: Structure; Stellar Dynamics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:University of British Columbia, 6224 Agricultural
Road, Vancouver, BC V6T 1Z1, Canada;
AB(Max-Planck-Institut f uuml;r Astronomie,
K ouml;nigstuhl 17, D-69117 Heidelberg, Germany;
AC(Department of Astronomy, University of
Wisconsin-Madison, 475 North Charter Street,
Madison, WI 53706;
<EMAIL>mab@astro.wisc.edu</EMAIL>), AD(Department
of Physics and Astronomy, University of British
Columbia, 6224 Agricultural Road, Vancouver, BC
V6T 1Z1, Canada;
AE(Max-Planck-Institut f uuml;r Astronomie,
K ouml;nigstuhl 17, D-69117 Heidelberg, Germany;
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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