Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 424, Issue 1, Pages 393-398Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2012.21209.x
Keywords
galaxies: active; quasars: individual: PKS 1222+216
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Funding
- Societa Carlo Gavazzi S.p.A.
- Thales Alenia Space Italia S.p.A
- Germany's National Research Centre for Aeronautics and Space (DLR) [FKZ 50 OR 1104]
- Fermi Guest Investigator [NNX08AW56G, NNX09AU10G]
- Alfred P. Sloan Foundation
- [ASI-INAF I/009/10/0]
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We investigate the optical spectral properties of the blazar PKS 1222+216 during a period of approximately three years. While the continuum is highly variable [i.e. from ?L?(5100 angstrom) 3.5 x 1045 erg s-1 up to 15.0 x 1045 erg s-1] the broad line emission is practically constant. This supports a scenario in which the broad line region is not affected by jet continuum variations. We thus infer the thermal component of the continuum from the line luminosity and show that it is comparable with the continuum level observed during the phases of minimum optical activity. The mass of the black hole is estimated through the virial method from the full width at half-maximum of Mg ii, H beta and Ha broad lines and from the thermal continuum luminosity. This yields a consistent black hole mass value of 6 x 108 M?.
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