KKH 22, the first dwarf spheroidal satellite of IC 342
Abstract
Aims: We present observations with the Advanced Camera for Surveys on the Hubble Space Telescope of the nearby dwarf spheroidal galaxy KKH 22 = LEDA 2807114 in the vicinity of the massive spiral galaxy IC 342.
Methods: We derived its distance of 3.12 ± 0.19 Mpc using the tip of red giant branch (TRGB) method. We also used the 6 m BTA spectroscopy to measure a heliocentric radial velocity of the globular cluster in KKH 22 to be +30 ± 10 km s-1.
Results: The dSph galaxy KKH 22 has the V-band absolute magnitude of -12.m19 and the central surface brightness μv, 0 = 24.1m/□″. Both the velocity and the distance of KKH 22 are consistent with the dSph galaxy being gravitationally bound to IC 342. Another nearby dIr galaxy, KKH 34, with a low heliocentric velocity of +106 km s-1 has the TRGB distance of 7.28 ± 0.36 Mpc residing in the background with respect to the IC 342 group. KKH 34 has a surprisingly high negative peculiar velocity of -236 ± 26 km s-1.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 2020
- DOI:
- 10.1051/0004-6361/202037993
- arXiv:
- arXiv:2005.03132
- Bibcode:
- 2020A&A...638A.111K
- Keywords:
-
- galaxies: dwarf;
- galaxies: distances and redshifts;
- galaxies: photometry;
- galaxies: individual: KKH22;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 7 pages, 6 figures, accepted in A&