A new galaxy near the local group in Draco

Citation
Id. Karachentsev et al., A new galaxy near the local group in Draco, ASTRON ASTR, 379(2), 2001, pp. 407-411
Citations number
17
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY & ASTROPHYSICS
ISSN journal
14320746 → ACNP
Volume
379
Issue
2
Year of publication
2001
Pages
407 - 411
Database
ISI
SICI code
1432-0746(200111)379:2<407:ANGNTL>2.0.ZU;2-Q
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 re d giant branch stars with the tip at I = 22.(m)32, and the presence of some blue stars. The derived true distance modulus, 26.(m) 35 +/- 0.(m)14, corr esponds to linear distances of KKR 25 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 surf ace brightness (Sigma (0,V) = 24.(m) 0 +/- 0.(m) 2/square") 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, KKR 25 moves away from the LG centroid at a velocity of V-LG = +72 km s(-1).