Globular clusters in the stellar stream surrounding the Milky Way analog
  NGC 5907
  We study the globular clusters (GCs) in the spiral galaxy NGC~5907 well-known
for its spectacular stellar stream -- to better understand its origin. Using
wide-field Subaru/Suprime-Cam $gri$ images and deep Keck/DEIMOS multi-object
spectroscopy, we identify and obtain the kinematics of several GCs superimposed
on the stellar stream and the galaxy disk. We estimate the total number of
globular clusters in NGC 5907 to be $154\pm44$, with a specific frequency of
$0.73\pm0.21$. Our analysis also reveals a significant, new population of young
star cluster candidates found mostly along the outskirts of the stellar disk.
Using the properties of the stream GCs, we estimate that the disrupted galaxy
has a stellar mass similar to the Sagittarius dwarf galaxy accreted by the
Milky Way, i.e. $\sim10^8~M_\odot$.
