Optical variability of quasars - Statistics and cosmological properties

Details Optical variability of quasars - Statistics and cosmological properties Optical variability of quasars - Statistics and cosmological properties

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..345g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 345-348. Research supported by Ministero dell'Univer

Mathematics

Logic

48

Cosmology, Quasars, Stellar Magnitude, Time Lag, Visible Spectrum, Light Curve, Red Shift, Statistical Analysis

Scientific paper

The long-term optical variability of a composite, complete sample of quasars is investigated. While no correlation with luminosity is detected, a positive correlation with redshift is found (p = 0.25). These results are reconciled with previous opposite findings of other authors, arguing that the analysis of variability can be biased by the combined effect of the structure function of light curves and of cosmological time dilation. Such bias becomes negligible if variability is measured by a magnitude difference at a fixed and large time lag (4 yr). Interpretation of this cosmological trend is given in terms of spectral variability. Statistical biases on the estimate of the evolution rate for the quasar population are discussed.

Affiliated with

Also associated with

No associations

Rating

Optical variability of quasars - Statistics and cosmological properties 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 Optical variability of quasars - Statistics and cosmological properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical variability of quasars - Statistics and cosmological properties will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1725334