First embedded cluster formation in California molecular cloud
  We performed a multi-wavelength observation toward LkHa 101 embedded cluster
and its adjacent 85arcmin*60arcmin region. The LkHa 101 embedded cluster is the
first and only one significant cluster in California molecular cloud (CMC).
These observations have revealed that the LkHa 101 embedded cluster is just
located at the projected intersectional region of two filaments. One filament
is the highest-density section of the CMC, the other is a new identified
filament with a low-density gas emission. Toward the projected intersection, we
find the bridging features connecting the two filaments in velocity, and
identify a V-shape gas structure. These agree with the scenario that the two
filaments are colliding with each other. Using the Five-hundred-meter Aperture
Spherical radio Telescope (FAST), we measured that the RRL velocity of the LkHa
101 H II region is 0.5 km/s, which is related to the velocity component of the
CMC filament. Moreover, there are some YSOs distributed outside the
intersectional region. We suggest that the cloud-cloud collision together with
the fragmentation of the main filament may play an important role in the YSOs
formation of the cluster.
