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We study properties of the host galaxies of 15 hard X-ray selected type-2active galactic nuclei (AGNs) at intermediate redshifts (0.05$<z<$0.6) detectedin $ASCA$ surveys. The absorption corrected hard X-ray luminosities $L_{\rm2-10 keV}$ range from 10$^{42}$ erg s$^{-1}$ to $10^{45}$ erg s$^{-1}$. We tookthe $R$-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 thegalaxies with a spheroid component and a disk component. The resulting spheroidluminosities correlate with $L_{\rm 2-10 keV}$; higher (lower) X-ray luminosityAGNs tend to reside in luminous (less luminous) spheroids. It is also foundthat 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. Thecorrelation between $L_{\rm 2-10keV}$ and spheroid luminosity indicates thatthe relation between mass of a supermassive black hole (SMBH) and spheroidluminosity (BS-relation) at the intermediate redshifts. The BS-relation agreeswith 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 similarredshifts through the broad-line width and continuum luminosity. The presentstudy demonstrates the effectiveness of using type-2 AGNs at high redshifts tostudy their host properties.Comment: 21 pages, 8 figures, ApJ accepte

Host Galaxies of Hard X‐Ray–Selected Type 2 Active Galactic Nuclei at Intermediate Redshifts