Time Variability of Quasars: the Structure Function Variance

@article{MacLeod2008TimeVO,
  title={Time Variability of Quasars: the Structure Function Variance},
  author={Chelsea MacLeod and Željko Ivezi{\'c} and Willem Hendrik de Vries and Branimir Sesar and Andrew C. Becker},
  journal={arXiv: Astrophysics},
  year={2008},
  volume={1082},
  pages={282-286}
}
Significant progress in the description of quasar variability has been recently made by employing SDSS and POSS data. Common to most studies is a fundamental assumption that photometric observations at two epochs for a large number of quasars will reveal the same statistical properties as well‐sampled light curves for individual objects. We critically test this assumption using light curves for a sample of ∼2,600 spectroscopically confirmed quasars observed about 50 times on average over 8… 

Figures from this paper

A Description of Quasar Variability Measured Using Repeated SDSS and POSS Imaging
We provide a quantitative description and statistical interpretation of the optical continuum variability of quasars. The Sloan Digital Sky Survey (SDSS) has obtained repeated imaging in five
Selecting Quasars by Their Intrinsic Variability
We present a new and simple technique for selecting extensive, complete, and pure quasar samples, based on their intrinsic variability. We parameterize the single-band variability by a power-law
The Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
We model the time variability of ~9000 spectroscopically confirmed quasars in SDSS Stripe 82 as a damped random walk (DRW). Using 2.7 million photometric measurements collected over 10 yr, we confirm
Variability selected high-redshift quasars on SDSS Stripe 82
The SDSS-III BOSS Quasar survey will attempt to observe z > 2.15 quasars at a density of at least 15 per square degree to yield the first measurement of the baryon acoustic oscillations in the Ly-α
Optical variability of quasars: a damped random walk
Abstract A damped random walk is a stochastic process, defined by an exponential covariance matrix that behaves as a random walk for short time scales and asymptotically achieves a finite variability
The Sloan Digital Sky Survey Reverberation Mapping Project: Ensemble Spectroscopic Variability of Quasar Broad Emission Lines
We explore the variability of quasars in the MgII and Hbeta broad emission lines and UV/optical continuum emission using the Sloan Digital Sky Survey Reverberation Mapping project (SDSS-RM). This is
Détections des oscillations acoustiques de baryons grâce aux forêts Lyman-α des spectres de quasars de l'expérience BOSS
Les oscillations acoustiques de baryons (BAO) constituent une regle standard permettant de contraindre les differents modeles cosmologiques. Cette these rend compte de la premiere mesure des BAO dans

References

SHOWING 1-10 OF 15 REFERENCES
Quasar variability measurements with SDSS repeated imaging and POSS data
We analyze the properties of quasar variability using repeated SDSS imaging data in five UV-to-far red photometric bands, accurate to 0.02 mag, for ∼13,000 spectroscopically confirmed quasars. The
The Ensemble Photometric Variability of ~25,000 Quasars in the Sloan Digital Sky Survey
Using a sample of over 25,000 spectroscopically confirmed quasars from the Sloan Digital Sky Survey, we show how quasar variability in the rest-frame optical/UV regime depends on rest-frame time lag,
Composite Quasar Spectra from the Sloan Digital Sky Survey
We have created a variety of composite quasar spectra using a homogeneous data set of over 2200 spectra from the Sloan Digital Sky Survey (SDSS). The quasar sample spans a redshift range of 0.044 ≤ z
Astrophys. J
  • Astrophys. J
  • 1998
Ivezi´Ivezi´c, and 14 co-authors
  • Astron. J
  • 2006
co-autho rs,Astron
  • J., 122,
  • 2001
Kron, and 11 co-authors
  • Astrophys. J
  • 2004
Ivezíc, and 14 co-authors
  • Astron. J.,
  • 2006
Astron. J
  • Astron. J
  • 2007
Astron. J
  • Astron. J
  • 2007
...
...