Andromeda XIX member stars

We present spectra for ~100 red giant branch stars in this galaxy, plus 16 stars in a nearby stellar stream. With this exquisite data set, we re-derive the properties of And XIX, measuring a systemic velocity of <v_r_>=-109.0+/-1.6km/s and a velocity dispersion of {sigma}_vr_=7.8^+1.7^_-1.5_km/s (higher than derived in our previous work).

We marginally detect a velocity gradient along the major axis of dv/dX=-2.1+/-1.8km/s/kpc. We find its mass-to-light ratio is higher than galaxies of comparable stellar mass ([M/L]_half_=278^+146^_-198_M_{sun}_/L_{sun}_), but its dynamics place it in a halo with a similar total mass to these galaxies. This could suggest that And XIX is a 'puffed up' dwarf galaxy, whose properties have been altered by tidal processes, similar to its Milky Way counterpart, Antlia II.