A new galaxy near the Local Group in Draco

Details A new galaxy near the Local Group in Draco A new galaxy near the Local Group in Draco

2001-10-06

arxiv.org/abs/astro-ph/0110158v1

2001, Astronomy & Astrophysics 379, 407

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures, accepted for publication in Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20011344

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.

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