TY - JOUR
T1 - Muitiwavelengths observations of lensed quasars
T2 - 8th International Workshop on Multifrequency Behaviour of High Energy Cosmic Sources
AU - Koptelova, E.
AU - Oknyanskij, V.
AU - Artamonov, B.
AU - Chen, W. P.
N1 - Publisher Copyright:
© SAIt 2010.
PY - 2010
Y1 - 2010
N2 - The time delays between brightness variations in two different optical bands have been measured for a large number of low-redshift AGN and nonlensed quasars. These time delays represent a light travel time between two different emission regions and can be used to test variability mechanisms in the source. We search for the interband delays in a sample of lensed quasars: Q2237+0305, SBS1520+530, HE2149-2745, HE1104-1805, UM673 in the redshift range 1.7 ≲ z ≲ 2.7. From cross-correlation analysis of light curves of the quasars we find that the brightness variations at longer wavelengths may follow the brightness variations at shorter wavelengths. The observed delays are consistent with the delays expected from reprocessing in accretion disc irradiated by the central variable source.
AB - The time delays between brightness variations in two different optical bands have been measured for a large number of low-redshift AGN and nonlensed quasars. These time delays represent a light travel time between two different emission regions and can be used to test variability mechanisms in the source. We search for the interband delays in a sample of lensed quasars: Q2237+0305, SBS1520+530, HE2149-2745, HE1104-1805, UM673 in the redshift range 1.7 ≲ z ≲ 2.7. From cross-correlation analysis of light curves of the quasars we find that the brightness variations at longer wavelengths may follow the brightness variations at shorter wavelengths. The observed delays are consistent with the delays expected from reprocessing in accretion disc irradiated by the central variable source.
KW - Quasars: accretion discs
KW - Quasars: gravitational lensing
KW - Quasars: observations
UR - http://www.scopus.com/inward/record.url?scp=84874615464&partnerID=8YFLogxK
M3 - 會議論文
AN - SCOPUS:84874615464
SN - 1824-0178
VL - 81
SP - 138
EP - 143
JO - Memorie della Societa Astronomica Italiana, Supplementi - Journal of the Italian Astronomical Society, Supplement
JF - Memorie della Societa Astronomica Italiana, Supplementi - Journal of the Italian Astronomical Society, Supplement
IS - 1
Y2 - 25 May 2009 through 30 May 2009
ER -