Stellar proper motions in the outskirts of classical dwarf spheroidal galaxies withGaiaEDR3

• DOI: 10.1093/mnras/stac805
• Publication Date: 2022-03-23T04:14:10Z
• Authors: Yuewen Qi; Paul Zivick; Andrew B Pace; Alexander H Riley; Louis E Strigari
• Keywords: Dwarf spheroidal galaxy

We use Gaia EDR3 data to identify stars associated with six classical dwarf spheroidals (Draco, Ursa Minor, Sextans, Sculptor, Fornax, Carina) at their outermost radii, beyond nominal King stellar limiting radius. For all of the dSphs examined, we find radial velocity matches residing radius and $> 50\%$ astrometric probability (four in Draco, two eight twelve five Carina), indicating that these are respective (dSphs) high probability. compare positions our candidate "extra-tidal" orbital tracks galaxies, stars, both without matches, consistent lying along track satellites. However, given small number cannot make any conclusive statements about significance spatially correlated stars. Cross matching publicly available catalogs RR Lyrae, one Lyrae outside each Sculptor such candidates nine seven zero Carina. Follow-up spectra on candidates, including possible metallicity information, will help confirm association dSphs, could represent evidence for extended halos or tidal debris around dSphs.