Quasar variability measurements with SDSS repeated imaging and POSS data

被引：29

作者：

Ivezic, Z ^{[1
]}

Lupton, RH ^{[1
]}

Juric, M ^{[1
]}

Anderson, S ^{[1
]}

Hall, PB ^{[1
]}

Richards, GT ^{[1
]}

Rockosi, CM ^{[1
]}

Vanden Berk, DE ^{[1
]}

Turner, EL ^{[1
]}

Knapp, GR ^{[1
]}

Gunn, JE ^{[1
]}

Schlegel, D ^{[1
]}

Strauss, MA ^{[1
]}

Schneider, DP ^{[1
]}

机构：

[1] Princeton Univ, Princeton, NJ 08544 USA

来源：

INTERPLAY AMONG BLACK HOLES, STARS AND ISM IN GALACTIC NUCLEI | 2004年 / 222期

关键词：

D O I：

10.1017/S1743921304003126

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 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 1000 angstrom to 6000 angstrom. We demonstrate that similar to 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 I year.

引用

页码：525 / 526

页数：2

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