Volume 638, June 2020
|Number of page(s)||6|
|Published online||19 June 2020|
KKH 22, the first dwarf spheroidal satellite of IC 342⋆
Special Astrophysical Observatory, The Russian Academy of Sciences, Nizhnij Arkhyz, Karachai-Cherkessian Republic 369167, Russia
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
Accepted: 27 April 2020
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.
Key words: galaxies: dwarf / galaxies: distances and redshifts / galaxies: photometry / galaxies: individual: KKH22
Photometric magnitudes from Figs. 2 and 6, as well as the reduced spectrum are available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/638/A111
© ESO 2020
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