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 observed time lags span the range from 3 hours to over 3 years, and constrain the quasar variability fo...
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| Veröffentlicht in: | Proceedings of the International Astronomical Union 2004-03, Vol.2004 (IAUS222), p.525-526 |
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| container_title | Proceedings of the International Astronomical Union |
| container_volume | 2004 |
| creator | Ivezić, Ž. Lupton, R. H. Jurić, M. Anderson, S. Hall, P. B. Richards, G. T. Rockosi, C. M. Vanden Berk, D. E. Turner, E. L. Knapp, G. R. Gunn, J. E. Schlegel, D. Strauss, M. A. Schneider, D. P. |
| description | 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 observed time lags span the range from 3 hours to over 3 years, and constrain the quasar variability for rest-frame time lags of up to two years, and at rest-frame wavelengths from 1000Å to 6000Å. We demonstrate that ∼66,000 SDSS measurements of magnitude differences can be described within the measurement noise by a simple function of only three free parameters. The addition of POSS data constrains the long-term behavior of quasar variability and provides evidence for a turn-over in the structure function. This turn-over indicates that the characteristic time scale for optical variability of quasars is of the order 1 year.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html |
| doi_str_mv | 10.1017/S1743921304003126 |
| format | Article |
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H. ; Jurić, M. ; Anderson, S. ; Hall, P. B. ; Richards, G. T. ; Rockosi, C. M. ; Vanden Berk, D. E. ; Turner, E. L. ; Knapp, G. R. ; Gunn, J. E. ; Schlegel, D. ; Strauss, M. A. ; Schneider, D. P.</creator><creatorcontrib>Ivezić, Ž. ; Lupton, R. H. ; Jurić, M. ; Anderson, S. ; Hall, P. B. ; Richards, G. T. ; Rockosi, C. M. ; Vanden Berk, D. E. ; Turner, E. L. ; Knapp, G. R. ; Gunn, J. E. ; Schlegel, D. ; Strauss, M. A. ; Schneider, D. P.</creatorcontrib><description>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 observed time lags span the range from 3 hours to over 3 years, and constrain the quasar variability for rest-frame time lags of up to two years, and at rest-frame wavelengths from 1000Å to 6000Å. We demonstrate that ∼66,000 SDSS measurements of magnitude differences can be described within the measurement noise by a simple function of only three free parameters. The addition of POSS data constrains the long-term behavior of quasar variability and provides evidence for a turn-over in the structure function. 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| title | Quasar variability measurements with SDSS repeated imaging and POSS data |
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