Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-09
Astrophys.J.533:172-175,2000
Astronomy and Astrophysics
Astrophysics
13 pages, 2 figures
Scientific paper
10.1086/308671
We here estimate the mass M of the central object in five active galactic nuclei (AGNs), using the most recent reverberation data obtained by the AGN Watch Consortium. The cross-correlation function (CCF) centroids of the broad Ly-alpha 1216 and C IV 1549 lines are used to estimate the size of the broad-line region (BLR) in these sources. We calculate the velocity dispersions of these lines in the root mean square (rms) spectra and then use our results to estimate M. We argue that our technique of calculating the velocity dispersion should work in the general case of an arbitrary line profile, unlike methods that depend on the measurement of the full-width at half-maximum (FWHM) of the broad line. We also show that our results agree with the FWHM method in the limit of a normal (Gaussian) line profile. The masses calculated here are considerably smaller than those calculated with the previous generation of reverberation data.
Fromerth Michael J.
Melia Fulvio
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