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Title:
Optical monitoring of the z = 4.40 quasar Q2203+292
Authors:
Ovcharov, E. P.; Nedialkov, P. L.; Valcheva, A. T.; Ivanov, V. D.; Tikhonov, N. A.; Stanev, I. S.; Kostov, A. B.; Georgiev, Ts. B.
Affiliation:
AA(Department of Astronomy, University of Sofia, 5 James Bourchier, Sofia 1164, Bulgaria), AB(Department of Astronomy, University of Sofia, 5 James Bourchier, Sofia 1164, Bulgaria), AC(Institute of Astronomy, Sofia 1784, Bulgaria), AD(European Southern Observatory, Ave. Alonso de Cordova 3107, Casilla 19, Santiago 19001, Chile), AE(Special Astrophysical Observatory, Russian Academy of Sciences, N. Arkhyz, KChR 369167, Russia), AF(Department of Astronomy, University of Sofia, 5 James Bourchier, Sofia 1164, Bulgaria), AG(Institute of Astronomy, Sofia 1784, Bulgaria), AH(Institute of Astronomy, Sofia 1784, Bulgaria)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 386, Issue 1, pp. 819-825. (MNRAS Homepage)
Publication Date:
05/2008
Origin:
MNRAS
MNRAS Keywords:
quasars: general , quasars: individual: Q2203+292
DOI:
10.1111/j.1365-2966.2008.12990.x
Bibliographic Code:
2008MNRAS.386..819O

Abstract

We report Cousins R-band monitoring of the high-redshift (z = 4.40) radio-quiet quasar Q2203+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 Q2203+292 broad-line region mass of 0.3-0.4Msolar. 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.
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