Host Galaxies of Hard X-ray Selected Type-2 Active Galactic Nuclei at Intermediate Redshifts

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dc.creatorKiuchi, Gaku
dc.creatorOhta, Kouji
dc.creatorAkiyama, Masayuki
dc.creatorAoki, Kentaro
dc.creatorUeda, Yoshihiro
dc.date2006-04-13
dc.date2006-05-03
dc.date.accessioned2026-07-07T10:43:49Z
dc.date.available2026-07-07T10:43:49Z
dc.descriptionWe 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 $L_{\rm 2-10 keV}$ 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 $L_{\rm 2-10 keV}$; 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 $L_{\rm 2-10keV}$ and spheroid luminosity indicates that the relation between mass of a supermassive black hole (SMBH) and spheroid luminosity (BS-relation) at the intermediate redshifts. The 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.
dc.description21 pages, 8 figures, ApJ accepted
dc.identifierhttps://arxiv.org/abs/astro-ph/0604291
dc.identifierhttp://arxiv.org/abs/astro-ph/0604291
dc.identifierAstrophys.J.647:892-900,2006; Erratum-ibid.653:1583,2006
dc.identifierdoi:10.1086/505108
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182377
dc.subjectAstrophysics
dc.titleHost Galaxies of Hard X-ray Selected Type-2 Active Galactic Nuclei at Intermediate Redshifts
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