| Issue |
A&A
Volume 408, Number 1, September II 2003
|
|
|---|---|---|
| Page(s) | 111 - 118 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361:20030912 | |
| Published online | 17 November 2003 | |
Distances to nearby galaxies around IC 342 *,**
1
Special Astrophysical Observatory, Russian Academy of Sciences, N. Arkhyz, KChR 369167, Russia
2
Isaac Newton Institute, Chile, SAO Branch, Russia
3
Kitt Peak National Observatory, National Optical Astronomy Observatories, PO Box 26732, Tucson, AZ 85726, USA
4
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
Corresponding author: I. D. Karachentsev, ikar@luna.sao.ru
Received:
24
April
2003
Accepted:
10
June
2003
We present an analysis of Hubble Space Telescope/WFPC2 images of six
nearby galaxies in the projected vicinity of
IC 342: Cas dSph, KK 35, UGCA 86, Cam A, NGC 1560, and Cam B.
We derive distances to five of them from the luminosity
of the tip of the red giant branch stars with a typical accuracy of
10%. The galaxy distances are 0.79 Mpc (Cas dSph), 3.16 Mpc
(KK 35), 3.93 Mpc (Cam A), 3.45 Mpc (NGC 1560), and 3.34 Mpc (Cam B).
Two other observed galaxies, MB 2 and Cam C = KK 26,
turn out to be Galactic cirrus and a Galactic 
region, respectively.
Cas dSph belongs to the Local Group and is a companion of M 31.
Combining our data with literature results, we find that
there are seven dwarf galaxies associated with the giant spiral galaxy IC 342.
This group is characterized by an average distance of (3.28
0.15) Mpc,
an average radial velocity of (22923) km s-1, a projected radius of
322 kpc, a radial velocity dispersion of 60 km s-1, and a total blue
luminosity of 
. The derived virial and orbital
mass-to-luminosity ratios are 20 and 28 
, respectively.
The galaxy group around Maffei 1 has so far a less reliable distance
of ~3.0 Mpc and an average radial velocity of (30922) km s-1.
This group consists of eight galaxies and is characterized by a projected
radius of 112 kpc, a radial velocity dispersion of 59 km s-1, and a
total blue luminosity of 
.
For the Maffei group we estimate mass-to-light ratios of
and 
in solar units.
The sum of the virial (
) and orbital
(
) masses of both groups agree well with their
total mass, (10733) 
, derived from the radius of the
“zero velocity surface”, R0 = (0.90.1) Mpc, which separates the
IC 342/Maffei complex from the Hubble flow.
Key words: galaxies: dwarf / galaxies: distances and redshifts / galaxies: kinematics and dynamics / galaxies: individual: IC 342
© ESO, 2003
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