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 \citep ryu18 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 \replaced –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 \pm 4.3 kpc and \textrm { [ Fe / H ] } = -2.2 \pm 0.2 for RLGC 1 and d = 15.8 \pm 2.4 kpc and \textrm { [ Fe / H ] } = -2.1 \pm 0.3 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 .