Hostname: page-component-76fb5796d-x4r87 Total loading time: 0 Render date: 2024-04-26T19:09:52.087Z Has data issue: false hasContentIssue false
  • English
  • Français

Spectral Variability of Quasars in the Optical Band

Published online by Cambridge University Press:  12 April 2016

Dario Trèvese  and
Fausto Vagnetti
Dario Trèvese
Affiliation:
Dipartimento di Fisica, Università di Roma“La Sapienza”, Piazzale A.Moro 2, 2-00185 Roma, Italy
Fausto Vagnetti
Affiliation:
Dipartimento di Fisica, Università di Roma“Tor Vergata”, Via della Ricerca Scientifica 1, I-00133 Roma, Italy

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We performed a new analysis of the В and R light curves of a sample of PG QSOs. We confirm a variability-redshift correlation and its interpretation in terms of spectral variability. We find an intra-QSO and an inter-QSO α;-L correlation. The former can be explained neither by presence of the host galaxy nor by changes of the accretion rate. Hot spots due to accretion disk instabilities could explain the observations.

Type
Part 1. Optical Surveys for AGN
Information
International Astronomical Union Colloquium , Volume 184: AGN Surveys , 2002 , pp. 81 - 86
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Angione, R.J., & Smith, H.J. 1972, IAU Symp. 44, 171 Google Scholar
Aretxaga, I., Cid, Ferriades, & Terlevich, R., 1997, MNRAS, 286, 271 CrossRefGoogle Scholar
Bershady, M.A., Trèvese, D., & Kron, R.G. 1998, ApJ, 496, 103 CrossRefGoogle Scholar
Bonoli, F., Braccesi, A., Federici, L., & Zitelli, V., 1979, A&AS, 35, 391 Google Scholar
Cid Fernandes, R., Sodrè, L., Vieira da Silva, L., 2000 ApJ, 544, 123 Google Scholar
Cimatti, A., Zamorani, G., & Marano, B. 1993, MNRAS, 263, 236 CrossRefGoogle Scholar
Cristiani, S., Vio, R., & Andreani, P. 1990, AJ, 100, 56 Google Scholar
Cristiani, S., et al. 1996, A&A, 306, 395 Google Scholar
Cutri, R.M., et al. 1985, ApJ, 296, 423 CrossRefGoogle Scholar
Di Clemente, A., et al. 1996, ApJ, 463, 466 Google Scholar
Edelson, R.A., Krolik, J.H. Pike, G.F. 1990, ApJ, 359, 86 Google Scholar
Elvis, M., et al. 1994, ApJS, 95, 1 Google Scholar
Giallongo, E., Trèvese, D., Vagnetti, F.: 1991, ApJ, 377, 345 CrossRefGoogle Scholar
Giveon, U., et al. 1999, MNRAS, 306, 637 Google Scholar
Hawkins, M.R.S., 1983, MNRAS, 202, 571 Google Scholar
Hawkins, M.R.S., 1996, MNRAS, 278, 787 Google Scholar
Hook, I.M., et al. 1994, MNRAS, 268, 305 CrossRefGoogle Scholar
Kawaguchi, T., et al. 1998, ApJ, 504, 671 CrossRefGoogle Scholar
Kinney, A.L., et al. 1991, ApJS, 75, 645 CrossRefGoogle Scholar
Paltani, S., & Courvoisier, T.J.-L. 1994, AfcA, 291, 74 Google Scholar
Romano, P., & Peterson, B.M., 1998, ASP Conf. Ser. 175, 55 Google Scholar
Siemiginowska, , et al. 1995, ApJ, 454, 77 Google Scholar
Torricelli-Ciamponi, G., et al. 2000, A&A, 358, 57 Google Scholar
Trèvese, D., Kron, R.G., & Bunone, A., 2001, ApJ, 551, 103 Google Scholar
Trèvese, D., et al. 1994, ApJ, 433, 498 (T94)CrossRefGoogle Scholar
Trèvese, D., et al. 1989, AJ, 98, 108 Google Scholar
Trèvese, D., & Vagnetti, F., 2001, in ‘QSO Hosts and their Environments’, I. Marquez, et al. Eds., in press (astro-ph/0102252)Google Scholar
Trèvese, D., & Vagnetti, F., 2002, ApJ, (in press) (astro-ph/0110075)Google Scholar
Tripp, T.M., Bechtold, J., & Green, R.F. 1994, ApJ, 433, 533 Google Scholar
Ulrich, M.H., Maraschi, L., & Urry, C M. 1997, ARA&A, 35, 445 Google Scholar