A Nearby Analog of z~2 Compact Quiescent Galaxies with a Rotating Disk
  Recent studies have identified a population of compact quiescent galaxies at
z\sim2. These galaxies are very rare today and establishing the existence of a
nearby analog could allow us to study its structure in greater detail than is
possible at high redshift. Here we present such a local analog, NGC 5845, which
has a dynamical mass of M_dyn = 4.3\pm0.6\times10^10 M_sun and an effective
radius of only r_e = 0.45\pm0.05kpc. We study the structure and kinematics with
HST/WFPC2 data and previously published spatially resolved kinematics. We find
that NGC 5845 is similar to compact quiescent galaxies at z\sim2 in terms of
size versus dynamical mass (r_e-M_dyn), effective velocity dispersion versus
size (sigma_e-r_e), and effective velocity dispersion versus dynamical mass
(sigma_e-M_dyn). The galaxy has a prominent rotating disk evident in both the
photometry and the kinematics: it extends to well beyond \geq1/3 effective
radius and contribute to \geq1/4 of the total light of the galaxy. Our results
lend support to the idea that a fraction of z\sim2 compact galaxies have
prominent disks and positive mass-to-light ratio gradients, although we caution
that NGC 5845 may have had a different formation history than the more massive
compact quiescent galaxies at z\sim2.
