Medium Resolution Near-Infrared Spectra of the Host Galaxies of Nearby
  Quasars
  We present medium resolution near-infrared host galaxy spectra of low
redshift quasars, PG 0844 + 349 (z=0.064), PG 1226 + 023 (z=0.158), and PG
1426+015 (z=0.086). The observations were done by using the Infrared Camera and
Spectrograph (IRCS) at the Subaru 8.2 m telescope. The full width at half
maximum of the point spread function was about 0.3 arcsec by operations of an
adaptive optics system, which can effectively resolve the quasar spectra from
the host galaxy spectra. We spent up to several hours per target and developed
data reduction methods to reduce the systematic noises of the telluric
emissions and absorptions. From the obtained spectra, we identified absorption
features of Mg I (1.503 um), Si I (1.589 um) and CO (6-3) (1.619 um), and
measured the velocity dispersions of PG 0844 + 349 to be 132+/-110 km s-1 and
PG 1426 + 015 to be 264+/-215 km s-1. By using an M_BH-sigma relation of
elliptical galaxies, we derived the black hole (BH) mass of PG 0844+349,
log(M_BH/M_SUN) = 7.7+/-5.5 and PG 1426+015, log(M_BH/M_SUN) = 9.0+/-7.5. These
values are consistent with the BH mass values from broad emission lines with an
assumption of a virial factor of 5.5.
