Ultraluminous Infrared Galaxies in the AKARI All Sky Survey
  We present a new catalog of 118 Ultraluminous Infrared Galaxies (ULIRGs) and
one Hyperluminous Infrared Galaxy (HLIRG) by crossmatching AKARI all-sky survey
with the Sloan Digital Sky Survey Data Release 10 (SDSS DR10) and the Final
Data Release of the Two-Degree Field Galaxy Redshift Survey (2dFGRS). 40 of the
ULIRGs and one HLIRG are new identifications. We find that ULIRGs are
interacting pair galaxies or ongoing/post mergers. This is consistent with the
widely accepted view: ULIRGs are major mergers of disk galaxies. We confirm the
previously known positive trend between the AGN fraction and IR luminosity. We
show that ULIRGs have a large off-set from the 'main sequence' up to z~1; their
off-set from the z~2 'main sequence' is relatively smaller. We find a
consistent result with the previous studies showing that compared to local star
forming SDSS galaxies of similar mass, local ULIRGs have lower oxygen
abundances. We for the first time demonstrate that ULIRGs follow the
fundamental metallicity relation (FMR). The scatter of ULIRGs around the FMR
(0.09 dex - 0.5 dex) is comparable with the scatter of z~2-3 galaxies. Their
optical colors show that ULIRGs are mostly blue galaxies and this agrees with
previous findings. We provide the largest local (0.050 < z < 0.487) ULIRG
catalog with stellar masses, SFRs, gas metallicities and optical colors. Our
catalog provides us active galaxies analogous to high-z galaxies in the local
Universe where they can be rigorously scrutinized.
