The spiral structure in the Solar neighborhood
  The spiral structure in the Solar neighborhood is an important issue in
astronomy. In the past few years, there is significant progress in observation.
The distances for a large number of good spiral tracers, i.e. giant molecular
clouds, high-mass star-formation region masers, HII regions, O-type stars and
young open clusters, have been accurately estimated, making it possible to
depict the detailed properties of nearby spiral arms. In this work, we first
give an overview about the research status for the Galaxy's spiral structure
based on different types of tracers. Then the objects with distance
uncertainties better than 15\% and $<$0.5 kpc are collected and combined
together to depict the spiral structure in the Solar neighborhood. Five
segments related with the Perseus, Local, Sagittarius-Carina, Scutum-Centaurus
and Norma Arms are traced. With the large dataset, the parameters of the nearby
arm segments are fitted and updated. Besides the dominant spiral arms, some
substructures probably related to arm spurs or feathers are also noticed and
discussed.
