| 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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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; May2008, Vol. 386 Issue 2, p819-825, 7p, 5 Charts, 8 Graphs |
| Abstrakt: |
We report Cousins R-band monitoring of the high-redshift ( z= 4.40) radio-quiet quasar Q 2203+292 from 1999 May to 2007 October. 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 and 0.2 mag, respectively. The detected changes are at ∼3σ 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 . Narrow-band imaging search for redshifted Lyα from other emission-line objects at the same redshift shows no emission-line objects in the quasar vicinity. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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