Discovery of Two New Globular Clusters in the Milky Way
  The spatial distribution of known globular clusters (GCs) in the Milky Way
shows that the current census of GCs is incomplete in the direction of the
Galactic plane. We present the discovery of two new GCs located close to the
Galactic plane in the sky. These two GCs, RLGC 1 and RLGC 2, were discovered
serendipitously during our new cluster survey (Ryu & Lee 2018) based on
near-Infrared and mid-Infrared survey data. The two GCs show a grouping of
resolved stars in their $K$ band images and a presence of faint diffuse light
in their outer regions in the WISE $W1$ band images. They also show prominent
red giant branches (RGBs) in their $K$ vs. $(J-K)$ color-magnitude diagrams
(CMDs). We determine structural parameters of the two GCs using King profile
fitting on their $K$ band radial number density profiles. The determined values
are consistent with those of known GCs. Finally, we determine the distances,
metallicities, and reddenings of the two GCs using the isochrone fitting on
their CMDs. For the fitting, we assume that the ages of the two GCs are 12.6
Gyr and the brightest RGB stars of each cluster correspond to the tip of the
RGB. Distances and metallicities of the two GCs are estimated to be
$d=28.8\pm4.3$ kpc and $\textrm{[Fe/H]}=-2.2\pm0.2$ for RLGC 1 and
$d=15.8\pm2.4$ kpc and $\textrm{[Fe/H]}=-2.1\pm0.3$ for RLGC 2. These results
show that the two GCs are located at the far-half region of the Milky Way and
they may belong to the halo of the Milky Way.
