NGC 1569: Stellar and Gas Kinematics and Dark Matter Content

We present our results from long slit stellar spectroscopy from the KPNO 4-meter + Echelle spectrograph combined with high-resolution neutral hydrogen VLA data of NGC 1569. We examine the kinematics of the stars and gas in NGC 1569. In addition, we carefully measure the mass of the stars in NGC 1569 using a new SED fitting procedure. We compare the total mass in stars and gas to the dynamical mass derived from the maximum rotation speed and postulate that NGC 1569 may be dark matter deficient. However, when the rotation curve is compared to what is expected from ΛCDM cosmological simulations, it appears that the observed velocities in the outer disk of NGC 1569 agree with what is expected from an extended dark matter halo.