Optical monitoring of the z=4.40 quasar Q 2203+292
| Autor: | Ovcharov, E. P., Nedialkov, P. L., Valcheva, A. T., Ivanov, V. D., Tikhonov, N. A., Stanev, I. S., Kostov, A. B., Georgiev, Ts. B. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2008.12990.x |
| Popis: | We report Cousins R-band monitoring of the high-redshift (z=4.40) radio quiet quasar Q 2203+292 from May 1999 to October 2007. The quasar shows maximum peak-to-peak light curve amplitude of ~0.3 mag during the time of our monitoring, and ~0.9 mag when combined with older literature data. The rms of a fit to the light curve with a constant is 0.08 mag and 0.2 mag, respectively. The detected changes are at ~3-sigma level. The quasar was in a stable state during the recent years and it might have undergone a brightening event in the past. The structure function analysis concluded that the object shows variability properties similar to those of the lower redshift quasars. We set a lower limit to the Q 2203+292 broad line region mass of 0.3-0.4 M_odot. Narrow-band imaging search for redshifted Ly_alpha from other emission line objects at the same redshift shows no emission line objects in the quasar vicinity. Comment: 9 pages, 8 figures, accepted for publication in MNRAS |
| Databáze: | arXiv |
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