The 2nd PANDA Symposium on Multimessager Astronomy - Jets and Shocks in the Universe

the correlation between CIV and Hbeta line width for low-z and low-luminosity broad line AGNs

Not scheduled

20m

Xi'an

Oral Talk

Speaker

Ms Hong Li (Tsinghua University, Beijing)

Description

Compared with MgII, Halpha, Hbeta, the CIV mass estimator has been claimed to have a bias for high-z and and high-luminosity broad-line AGNs. We use a sample of ~70 low-redshift(z<0.8 ) AGNs with archive HST UV spectra and optical spectra from the literature(Marziani et al. 2003) to compare the CIV estimator and Hbeta estimator for the low-z and low-luminosity regime. We found that the continuum luminosity of L1350 and the broad line luminosities(LCIV and LHbeta) are well correlated with L5100. Relatively, L1350 and LCIV have larger scatter in the correlation with L5100. The CIV FWHM is poorly corrlated with Hbeta FWHM for low-z and low-luminosity AGNs. We try to correct CIV FWHM with the blueshifit of the CIV centroid relative to that of Hbeta, but it does not improve the agreements with the Hbeta estimator.