Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-29
Mon.Not.Roy.Astron.Soc.372:246-252,2006
Astronomy and Astrophysics
Astrophysics
9 pages, 3 figures, 1 table, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10850.x
Using 7.5-year spectroscopic monitoring data of a sample of 17 Palomar-Green QSOs (PG QSOs) (z=0.061-0.371), we obtain the optical spectral slope for each object at all epochs by a power-law fit to the spectra in continuum bands. All of these 17 PG QSOs exhibit obvious spectral slope variability. Most of the 17 objects show anti-correlation between the spectral slope and the rest-frame 5100$\AA$ continuum flux while five of them exist strong anti-correlation (correlation coefficient R larger than 0.5). For the ensemble of these 17 PG QSOs, a strong anti-correlation between the average spectral slope and the average rest-frame 5100$\AA$ luminosity is found while no correlation is found between the spectral slope and the Eddington ratio. A median anti-correlation between spectral slope changes and continuum flux variations is also found which indicates a hardening of the spectrum during bright phases. Accretion disk (jet) instability models with other mechanisms associated with changes in the accretion processes are promising.
Bian Wei
Huang Kaibin
Pu Xueke
No associations
LandOfFree
The relation between the optical spectral slope and the luminosity for 17 Palomar-Green QSOs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The relation between the optical spectral slope and the luminosity for 17 Palomar-Green QSOs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The relation between the optical spectral slope and the luminosity for 17 Palomar-Green QSOs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-366016