Filament Intersections and Cold Dense Cores in Orion A North
  We studied the filament structures and dense cores in OMC-2,3 region in Orion
A North molecular cloud using the high-resolution N2H+ (1-0) spectral cube
observed with the Atacama Large Millimeter/Submillimeter Array (ALMA). The
filament network over a total length of 2 pc is found to contain 170
intersections and 128 candidate dense cores. The dense cores are all displaced
from the infrared point sources (possible young stars), and the major fraction
of cores (103) are located around the intersections. Towards the intersections,
there is also an increasing trend for the total column density Ntot as well as
the the power-law index of the column-density Probability Distribution Function
(N-PDF), suggesting that the intersections would in general have more
significant gas assembly than the other part of the filament paths. The virial
analysis shows that the dense cores mostly have virial mass ratio of
alpha_vir=M_vir/M_gas<1.0, suggesting them to be bounded by the self gravity.
In the mean time, only about 23 percent of the cores have critical mass ratio
of alpha_crit=M_crit/M_gas<1.0, suggesting them to be unstable against core
collapse. Combining these results, it shows that the major fraction of the cold
starless and possible prestellar cores in OMC-2,3 are being assembled around
the intersections, and currently in a gravitationally bound state. But more
extensive core collapse and star formation may still require continuous
core-mass growth or other perturbatio
