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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 198451.0, MPI für Astronomie / Publikationen_mpia
Galaxy flow in the Canes Venatici I cloud
Authors:Karachentsev, I. D.; Sharina, M. E.; Dolphin, A. E.; Grebel, E. K.; Geisler, D.; Guhathakurta, P.; Hodge, P. W.; Karachentseva, V. E.; Sarajedini, A.; Seitzer, P.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:Astronomy and Astrophysics
Volume:398
Start Page:467
End Page:477
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present an analysis of Hubble Space
Telescope/WFPC2 images of eighteen galaxies in
the Canes Venatici I cloud. We derive their
distances from the luminosity of the tip of the
red giant branch stars with a typical accuracy
of ~ 12%. The resulting distances are 3.9 Mpc
(UGC 6541), 4.9 Mpc (NGC 3738), 3.0 Mpc (NGC
3741), 4.5 Mpc (KK 109), gt;6.3 Mpc (NGC
4150), 4.2 Mpc (UGC 7298), 4.5 Mpc (NGC 4244),
4.6 Mpc (NGC 4395), 4.9 Mpc (UGC 7559), 4.2 Mpc
(NGC 4449), 4.4 Mpc (UGC 7605), 4.6 Mpc (IC
3687), 4.7 Mpc (KK 166), 4.7 Mpc (NGC 4736), 4.2
Mpc (UGC 8308), 4.3 Mpc (UGC 8320), 4.6 Mpc (NGC
5204), and 3.2 Mpc (UGC 8833). The CVn I cloud
has a mean radial velocity of 286 +/- 9 km
s-1, a mean distance of 4.1 +/- 0.2
Mpc, a radial velocity dispersion of 50 km
s-1, a mean projected radius of 760
kpc, and a total blue luminosity of 2.2 x
1010 Lsun . Assuming
virial or closed orbital motions for the
galaxies, we estimated their virial and their
orbital mass-to-luminosity ratio to be 176 and 88
Msun /Lsun , respectively.
However, the CVn I cloud is characterized by a
crossing time of 15 Gyr, and is thus far from a
state of dynamical equilibrium. The large
crossing time for the cloud, its low content of
dSph galaxies ( lt;6%), and the almost
``primordial'' shape of its luminosity function
show that the CVn I complex is in a transient
dynamical state, driven rather by the free
Hubble expansion than by galaxy interactions.
Free Keywords:galaxies: dwarf; galaxies: distances and
; redshifts; galaxies: kinematics and dynamics -;
; galaxies: clusters: individual: canes venatici
; cloud
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Academy of Sciences, N. Arkhyz, KChR 369167,
Russia), AB(Special Astrophysical Observatory,
Russian Academy of Sciences, N. Arkhyz, KChR
369167, Russia; Isaac Newton Institute, Chile,
SAO Branch), AC(Kitt Peak National Observatory,
National Optical Astronomy Observatories, PO Box
26732, Tucson, AZ 85726, USA),
AD(Max-Planck-Institut f uuml;r Astronomie,
K ouml;nigstuhl 17, 69117 Heidelberg, Germany),
AE(Departamento de F iacute;sica, Grupo de
Astronom iacute;a, Universidad de
Concepci oacute;n, Casilla 160-C,
Concepci oacute;n, Chile), AF(Herzberg Fellow,
Herzberg Institute of Astrophysics, 5071 W.
Saanich Road, Victoria, B.C. V9E 2E7, Canada;
Permanent address: UCO/Lick Observatory,
University of California at Santa Cruz, Santa
Cruz, CA 95064, USA), AG(Permanent address:
UCO/Lick Observatory, University of California at
Santa Cruz, Santa Cruz, CA 95064, USA),
AH(Department of Astronomy, University of
Washington, Box 351580, Seattle, WA 98195, USA),
AI(Astronomical Observatory of Kiev University,
04053, Observatorna 3, Kiev, Ukraine),
AJ(Department of Astronomy, University of
Florida, Gainesville, FL 32611, USA)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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