KKH 22, the first dwarf spheroidal satellite of IC 342^⋆

¹ Special Astrophysical Observatory, The Russian Academy of Sciences, Nizhnij Arkhyz, Karachai-Cherkessian Republic 369167, Russia
e-mail: ikar@sao.ru
² Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
³ W. M. Keck Observatory, 65-1120 Mamalahoa Hwy, Kamuela, HI 96743, USA
⁴ Astronomy Department, University of Maryland, College Park, MD 20743, USA

Received: 20 March 2020
Accepted: 27 April 2020

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 μ_v, 0 = 24.1^m/□″. 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.