Volume 581, September 2015
|Number of page(s)||8|
|Published online||08 September 2015|
6-m telescope observations of three dwarf spheroidal galaxies with very low surface brightness⋆
1 Université Lyon 1, 69622 Villeurbanne; CRAL, Observatoire de Lyon, 69561 St. Genis Laval; CNRS UMR 5574, France
2 Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhny Arkhyz, 369167 Karachai-Cherkessia, Russia
3 Main Astronomical Observatory, National Academy of Sciences of Ukraine, 27 Akademika Zabolotnoho St., 03680 Kyiv, Ukraine
Received: 12 July 2015
Accepted: 20 July 2015
Dwarf spheroidal galaxies (dSphs) are mostly investigated in the Local Group. DSphs are difficult targets for observations because of their small size and very low surface brightness. Here we measure spectroscopic and photometric parameters of three candidates for isolated dSphs, KKH 65 = BTS23, KK 180, and KK 227, outside the Local Group. The galaxies are found to be of low metallicity and low velocity dispersion. They are among the lowest surface brightness objects in the Local Universe. According to the measured radial velocities, metallicities, and structural and photometric parameters, KKH 65 and KK 227 are representatives of the ultra-diffuse quenched galaxies. KKH 65 and KK 227 belong to the outer parts of the groups NGC 3414 and NGC 5371, respectively. KK 180 is located in the Virgo cluster infall region.
Key words: galaxies: dwarf / galaxies: distances and redshifts / galaxies: fundamental parameters / galaxies: photometry
Appendices are available in electronic form at http://www.aanda.org
© ESO, 2015
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