Minzhi Kong1; Xuebing Wu2; Ran Wang2; Jinlin Han1
Source Publicationchinesejournalofastronomyandastrophysics
AbstractBased on measured broad line region sizes in the reverberation-mapping AGN sample, two new empirical relations are introduced to estimate the central black hole masses of radio-loud high-redshift (z > 0.5) AGNs. First, using the archival IUE/HST spectroscopy data at UV band for the reverberation-mapping objects, we obtained two new empirical relations between the BLR size and Mg II/C IV emission line luminosity. Secondly, using the newly determined black hole masses of the reverberation-mapping sample as calibration, we found two new relationships for determining the black hole mass with the full width at half maximum and the luminosity of Mg II/C IV line. We then apply the relations to estimate the black hole masses of the AGNs in the Large Bright Quasar Survey and a sample of radio-loud quasars. For the objects with small radio-loudness, the black hole mass estimated using the R-BLR-L-Mg II/C IV relation is, consistent with that from the R-BLR-L-3000 angstrom/1350 angstrom relation. For radio-loud AGNs, however, the mass estimated from the R-BLR-L-Mg II/C IV relation is systematically lower than that from the continuum luminosity L (3000 angstrom/1350 angstrom). Because jets could have significant contributions to the UV/optical continuum luminosity of radio-loud AGNs, we emphasize once again that for radio-loud AGNs, the emission line luminosity may be a better tracer of the ionizing luminosity than the continuum luminosity, so that the relations between the BLR size and UV emission line luminosities should be used to estimate the black hole masses of. high redshift radio-loud AGNs.
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Minzhi Kong,Xuebing Wu,Ran Wang,et al. estimatingblackholemassesofagnsusingultravioletemissionlineproperties[J]. chinesejournalofastronomyandastrophysics,2006,6(4):396.
APA Minzhi Kong,Xuebing Wu,Ran Wang,&Jinlin Han.(2006).estimatingblackholemassesofagnsusingultravioletemissionlineproperties.chinesejournalofastronomyandastrophysics,6(4),396.
MLA Minzhi Kong,et al."estimatingblackholemassesofagnsusingultravioletemissionlineproperties".chinesejournalofastronomyandastrophysics 6.4(2006):396.
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