NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T12:38:08 PDT
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For refcode 2010MNRAS.406..597G:
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Copyright by Royal Astronomical Society. 2010MNRAS.406..597G Towards a complete census of active galactic nuclei in nearby galaxies: the incidence of growing black holes Goulding, A. D.; Alexander, D. M.; Lehmer, B. D.; Mullaney, J. R. Abstract. ABSTRACT We investigate the local supermassive black hole (SMBH) density function and relative mass accretion rates of all active galactic nuclei (AGNs) identified in a volume-limited sample of infrared (IR) bright galaxies (L_IR_ > 3 x 10^9^L_sun_) to D < 15Mpc. A data base of accurate SMBH mass (M_BH_) estimates is compiled from literature sources using physically motivated AGN modelling techniques (reverberation mapping, maser mapping and gas kinematics) and well-established indirect M_BH_ estimation methods (the M-{sigma}_*_ and M_BH_-L_K,bul_ relations). For the three sources without previously published M_BH_ estimates, we use Two Micron All Sky Survey (2MASS) K-band imaging and GALFIT to constrain the bulge luminosities, and hence SMBH masses. In general, we find the AGNs in the sample host SMBHs which are spread over a wide mass range [M_BH_ ~ (0.1-30) x 10^7^M_sun_], but with the majority in the poorly studied M_BH_ ~ 10^6^-10^7^M_sun_ region. Using sensitive hard X-ray (2-10keV) and mid-IR constraints we calculate the bolometric luminosities of the AGNs (L_Bol,AGN_) and use them to estimate relative mass accretion rates. We use these data to calculate the volume-averaged SMBH growth rate of galaxies in the local Universe and find that the AGNs hosting SMBHs in the mass range M_BH_ ~ 10^6^-10^7^M_sun_ are dominated by optically unidentified AGNs. These relatively small SMBHs are acquiring a significant proportion of their mass in the present day, and are amongst the most rapidly growing in the local Universe (SMBH mass-doubling times of ~6Gyr). Additionally, we find tentative evidence for an increasing volume-weighted AGN fraction with decreasing SMBH mass in the M_BH_ ~ 10^6^-10^8^M_sun_ range. Overall, we conclude that significant mass accretion on to small SMBHs may be missed in even the most sensitive optical surveys due to absent or weak optical AGN signatures. Key words: galaxies: active, galaxies: evolution, galaxies: nuclei, galaxies: Seyfert, infrared: galaxies
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