Skip to main content Accessibility help
×
Home

AGN Variability

  • Toshihiro Kawaguchi (a1) and Shin Mineshige (a1)

Abstract

A number of monitoring observations of continuum emission from Active Galactic Nuclei (AGNs) have been made in optical-X-ray bands. The results obtained so far show (i) random up and down on timescales longer than decades, (ii) no typical timescales of variability on shorter timescales and (iii) decreasing amplitudes as timescales become shorter. The second feature indicates that any successful model must produce a wide variety of shot-amplitudes and -durations over a few orders in their light curves. In this sense, we conclude that the disk instability model is favored over the starburst model, since fluctuations on days are hard to produce by the latter model.

Inter-band correlations and time lags also impose great constraints on models. Thus, constructing wavelength and time dependent models remains as future work.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      AGN Variability
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      AGN Variability
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      AGN Variability
      Available formats
      ×

Copyright

References

Hide All
Aretxaga, I., Cid Fernandes, R., & Terlevich, R. J. 1997, MNRAS, 286, 271
Bak, P., Tang, C., & Wiesenfeld, K. 1988, Phys.Rev.A, 38, 364
Cid Fernandes, R. et al. 1996, MNRAS, 283, 419
Clavel, J. C. et al. 1991, ApJ, 366, 64
Courvoisier, T. J.-L. 1998, these proceedings
Cristiani, S. et al. 1996, A&A, 306, 395
Di Clemente, A. et al. 1996, ApJ, 463, 466
Edelson, R. A. et al. 1996, ApJ, 470, 364
Fahlman, G. G., & Ulrych, T. J. 1975, ApJ, 201, 277
Hayashida, K. et al. 1998, ApJ, 500, 642
Hook, I. M. et al. MNRAS, 268, 305
Kawaguchi, T., Mineshige, S., Umemura, M., & Turner, E. L. 1998, ApJ, 504, 671
Korista, K. T. et al. 1995, ApJS, 97, 285
Kundić, T. et al. 1997, ApJ, 482, 75
Leighly, K. M., & O'Brien, P. T. 1997, ApJ, 481, L15
Maoz, D. et al. 1993, ApJ, 404, 576
Matsumoto, R., & Shibata, K. 1998, in preparation
Mineshige, S., Takeuchi, M., & Nishimori, H. 1994, ApJ, 435, L125
Nandra, K. et al. 1998, ApJ, 505, 594
Paltani, S., & Courvoisier, T. J.-L. 1997, A&A, 323, 717
Peterson, B. M. et al. 1994, ApJ, 425, 622
Peterson, B. M. et al. 1998, PASP, 110, 660
Takeuchi, M., Mineshige, S., & Negoro, H. 1995, PASJ, 47, 617
Terlevich, R. et al. MNRAS, 255, 713
Trèvese, D. 1998, these proceedings
Ulrich, M.-H., Maraschi, L., & Urry, C. M. 1997, ARA&A, 35, 445

AGN Variability

  • Toshihiro Kawaguchi (a1) and Shin Mineshige (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed