Dear Guest

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The lightcurves presented here are part of a paper entitled 'Long-term optical variability properties of the Palomar-Green quasars' by Uriel Giveon, Dan Maoz, Shai Kaspi, Hagai Netzer, and Paul S. Smith, accepted on February 16, 1999 by the MNRAS (see also http://xxx.lanl.gov/abs/astro-ph/9902254).

In the following directories, named after the objects,
you will find a directory for each band used (B and R),
and in it a file named 'lightcurve' containing the
following data:

Column 1 - Julian date

Column 2 - Apparent magnitude

Column 3 - Total photometric error

Column 4 - Error due to the scatter in the reference star magnitudes

Column 5 - PSF fitting error of the quasar

Column 6 - Number of comparison stars used in that epoch

Column 7 - Image name (consists of observation date and serial number)

The last row gives the statistics of the lightcurve:

Number of data points

Total period

Mean sampling interval

Mean magnitude

Median magnitude

Standard deviation of the lightcurve

Mean difference of magnitudes

Median difference of magnitudes

Maximal difference of magnitudes

Mean gradient of the lightcurve (in mag per year)

Median gradient of lightcurve (in mag per year)

Maximal gradient of lightcurve (in mag per year)

allightcurves.tar.gz is a tar file containing these lightcurves together for convenience.

Individual files:

pg0026/B/lightcurve

pg0026/R/lightcurve

pg0052/B/lightcurve

pg0052/R/lightcurve

pg0804/B/lightcurve

pg0804/R/lightcurve

pg0838/B/lightcurve

pg0838/R/lightcurve

pg0844/B/lightcurve

pg0844/R/lightcurve

pg0923/B/lightcurve

pg0923/R/lightcurve

pg0953/B/lightcurve

pg0953/R/lightcurve

pg1001/B/lightcurve

pg1001/R/lightcurve

pg1012/B/lightcurve

pg1012/R/lightcurve

pg1048/B/lightcurve

pg1048/R/lightcurve

pg1100/B/lightcurve

pg1100/R/lightcurve

pg1114/B/lightcurve

pg1114/R/lightcurve

pg1115/B/lightcurve

pg1115/R/lightcurve

pg1121/B/lightcurve

pg1121/R/lightcurve

pg1151/B/lightcurve

pg1151/R/lightcurve

pg1202/B/lightcurve

pg1202/R/lightcurve

pg1211/B/lightcurve

pg1211/R/lightcurve

pg1226/B/lightcurve

pg1226/R/lightcurve

pg1229/B/lightcurve

pg1229/R/lightcurve

pg1307/B/lightcurve

pg1307/R/lightcurve

pg1309/B/lightcurve

pg1309/R/lightcurve

pg1322/B/lightcurve

pg1322/R/lightcurve

pg1351/B/lightcurve

pg1351/R/lightcurve

pg1354/B/lightcurve

pg1354/R/lightcurve

pg1402/B/lightcurve

pg1402/R/lightcurve

pg1404/B/lightcurve

pg1404/R/lightcurve

pg1411/B/lightcurve

pg1411/R/lightcurve

pg1415/B/lightcurve

pg1415/R/lightcurve

pg1426/B/lightcurve

pg1426/R/lightcurve

pg1427/B/lightcurve

pg1427/R/lightcurve

pg1444/B/lightcurve

pg1444/R/lightcurve

pg1512/B/lightcurve

pg1512/R/lightcurve

pg1519/B/lightcurve

pg1519/R/lightcurve

pg1545/B/lightcurve

pg1545/R/lightcurve

pg1613/B/lightcurve

pg1613/R/lightcurve

pg1617/B/lightcurve

pg1617/R/lightcurve

pg1626/B/lightcurve

pg1626/R/lightcurve

pg1700/B/lightcurve

pg1700/R/lightcurve

pg1704/B/lightcurve

pg1704/R/lightcurve

pg2130/B/lightcurve

pg2130/R/lightcurve

pg2233/B/lightcurve

pg2233/R/lightcurve

pg2251/B/lightcurve

pg2251/R/lightcurve