We study properties of the host galaxies of 15 hard X-ray selected type-2 active galactic nuclei ( AGNs ) at intermediate redshifts ( 0.05 < z < 0.6 ) detected in ASCA surveys .
The absorption corrected hard X-ray luminosities L _ { 2 - 10 keV } range from 10 ^ { 42 } erg s ^ { -1 } to 10 ^ { 45 } erg s ^ { -1 } .
We took the R -band image of these AGNs with the University of Hawaii 2.2 m telescope .
Thanks to the intrinsic obscuration of nuclear light , we can decompose the galaxies with a spheroid component and a disk component .
The resulting spheroid luminosities correlate with L _ { 2 - 10 keV } ; higher ( lower ) X-ray luminosity AGNs tend to reside in luminous ( less luminous ) spheroids .
It is also found that the hosts of luminous AGNs show a large spheroid-to-disk luminosity ratio ( \sim 1 ) , while those of less luminous AGNs spread between 0 and 1 .
The correlation between L _ { 2 - 10 keV } and spheroid luminosity indicates that the relation between mass of a supermassive black hole ( SMBH ) and spheroid luminosity ( BS-relation ) at the intermediate redshifts .
BS-relation agrees with that in the local universe , if the Eddington ratio of 0.24 is adopted , which is a mean value determined from our ASCA type-1 AGN sample at similar redshifts through the broad-line width and continuum luminosity .
The present study demonstrates the effectiveness of using type-2 AGNs at high redshifts to study their host properties .