There is a newer version of the record available.

Published January 8, 2022 | Version 1
Journal article Open

Optical Variability of Quasars with 20-Year Photometric Light Curves

  • 1. University of Illinois at Urbana-Champaign
  • 2. University of Illinois at Urbana Champaign
  • 3. Harvard-Smithsonian Center for Astrophysics
  • 4. University of Illinois Urbana-Champaign
  • 5. Universidade Estadual Paulista
  • 6. Fermi National Accelerator Laboratory
  • 7. University of Portsmouth
  • 8. Sorbonne Université
  • 9. Ludwig-Maximilians-Universität
  • 10. University College London
  • 11. Stanford University
  • 12. Laboratório Interinstitucional de e-Astronomia
  • 13. Universitat Autònoma de Barcelona
  • 14. University of Michigan
  • 15. Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
  • 16. Indian Institute of Technology Hyderabad
  • 17. University of Oslo
  • 18. Universitat Autònoma de Madrid
  • 19. Institut d'Estudis Espacials de Catalunya (IEEC)
  • 20. University of Queensland
  • 21. Santa Cruz Institute for Particle Physics
  • 22. The Ohio State University
  • 23. Macquarie University
  • 24. The Australian National University
  • 25. Instituciò Catalana de Recerca i Estudis Avançats
  • 26. University of Wisconsin-Madison
  • 27. Princeton University
  • 28. Fermi National Accelerator
  • 29. University of Southampton
  • 30. Oak Ridge National Laboratory
  • 31. Waldorf High School of Massachusetts Bay


TotalDat.fits.gz: A FITS table storing information for each of the quasars used in the sample. The names, formats, and contents of each of the columns in this table are described in Table 1. All time-series data (MJD_x, MAG_x, MAG_ERR_x), structure function data (DT_REST_x, SF_x, SF_ERR_x), and PSD data (REST_FREQ_x, CARMA_PSD_x, CARMA_PSD_ERR_L_x, CARMA_PSD_ERR_U_x) are stored as arrays.


EnsDat.fits.gz: A FITS table storing information for the ensemble analysis conducted on different subsets of the total sample. The names, formats, and contents of each of the columns in this table are described in Table 2. Similar to the previous file, time-series, structure function, and PSD data are stored as arrays.


It should be noted that for each quasar/ensemble, each array will be the same length to conform to the FITS file standards. Therefore, to force each array to be the same shape, arrays shorter than the largest array will be filled with either NaNs or empty strings until they reach this maximum array length. There will be three columns for many of the values, one for each bandpass (g,r,i), also described in Table 1. 


Updated 2/9/2023. See Version 2.


Files (20.3 MB)

Name Size Download all
659.5 kB Download
19.7 MB Download

Additional details

Related works

Is supplement to
Journal article: arXiv:2201.02762 (arXiv)
Journal article: 10.1093/mnras/stac1259 (DOI)