A new galaxy near the Local Group in Draco
Abstract
We present HST WFPC2 and ground-based images of the low surface brightness dwarf Irr/Sph galaxy KKR~25 in Draco. Its colour-magnitude diagram shows red giant branch stars with the tip at I = 22.32 mag, and the presence of some blue stars. The derived true distance modulus, 26.35 \+- 0.14 mag, corresponds to linear distances of KKR25 from the Milky Way and from the Local Group centroid of 1.86 and 1.79 Mpc, respectively. The absolute magnitude of the galaxy, M_V = -10.48, its linear diameter (0.54 Kpc) and central surface brightness (24.0 +- 0.2 mag\arcsec^2) are typical of other dIrr/dSphs in the Local Group. Being situated just beyond the radius of the zero-velocity surface of the Local Group, KKR25 moves away from the LG centroid at a velocity of V_{LG} = + 72 km/s.
Cite
@article{arxiv.astro-ph/0110158,
title = {A new galaxy near the Local Group in Draco},
author = {I. D. Karachentsev and M. E. Sharina and A. E. Dolphin and D. Geisler and E. K. Grebel and P. Guhathakurta and P. W. Hodge and V. E. Karachentseva and A. Sarajedini and P. Seitzer},
journal= {arXiv preprint arXiv:astro-ph/0110158},
year = {2009}
}
Comments
9 pages, 5 figures, accepted for publication in Astronomy & Astrophysics