  Our aim is to identify substellar members of the nearby Hyades open star
cluster to determine the photometric and spectroscopic properties of brown
dwarfs at moderately old ages and extend our knowledge of the substellar mass
function of the cluster. We cross-matched the 2MASS and WISE public catalogues
and measured proper motions to identify low-mass stars and brown dwarf member
candidates in an area of a radius of ten degrees around the central region of
the Hyades cluster. We employed astrometric and photometric criteria, Gaia
data, and a maximum likelihood method developed by our group to estimate
distances. We selected 36 objects that are candidate Hyades members, 21 of
which have not been reported previously. We have identified 21 new Hyades
member candidates that are placed at the lower end of the main sequence. The
photometry of 9 candidates places them in the substellar regime, and 2 are at
the L/T transition. We also recovered a number of L dwarfs from earlier
surveys. Finally, we calculated the mass function for the low-mass population
of the cluster and found that the Hyades cluster might have lost 60\%\ to 80\%
of its substellar members.
