Abstract
The monitoring of the gravitational lens Q2237+0305 carried out by the OGLE group during 1997–2000 is analyzed. The significant light amplifications in the C and A quasar components with maxima in mid-and late 1999, respectively, are interpreted as the crossing of microlens caustics by the source. A constraint on the emitting-region size R≤1015 cm has been obtained from the light-curve shape by assuming a power-law quasar brightness distribution (r 2+R 2)−p. To estimate the exponent p∼1.2 requires refining the standard model for the quasar continuum formation in an optically thick accretion disk with p=1.5.
Similar content being viewed by others
References
E. Agol and J. Krolik, Astrophys. J. 524, 49 (1999).
R. D. Blandford and R. Narayan, Astrophys. J. 310, 568 (1986).
P. V. Bliokh, V. N. Dudinov, V. G. Vakulik, et al., Kinematika Fiz. Nebesnykh Tel 15, 338 (1999).
K. Chang and S. Refsdal, Astron. Astrophys. 132, 168 (1984).
R. T. Corrigan, M. J. Irwin, J. Arnaud, et al., Astron. J. 102, 34 (1991).
C. J. Fluke and R. L. Webster, Mon. Not. R. Astron. Soc. 302, 68 (1999).
B. Grieger, R. Kayser, and T. Schramm, Astron. Astrophys. 252, 508 (1991).
M. J. Irwin, R. L. Webster, P. C. Hewett, et al., Astron. J. 98, 1989 (1989).
G. F. Lewis and M. J. Irwin, Mon. Not. R. Astron. Soc. 283, 225 (1996).
T. Manmoto, S. Mineshige, and M. Kusunose, Astrophys. J. 489, 791 (1997).
S. Mineshige and A. Yonehara, Publ. Astron. Soc. Jpn. 51, 497 (1999).
R. Østensen, S. Refsdal, R. Stabell, et al., Astron. Astrophys. 309, 59 (1996).
W. Press, S. Teukolsky, W. Vetterling, et al., Numerical Recipes in FORTRAN (Cambridge Univ. Press, Cambridge, 1992, 2nd ed.), p. 675.
P. Schneider and R. V. Wagoner, Astrophys. J. 314, 154 (1987).
P. Schneider and A. Weiss, Astron. Astrophys. 171, 49 (1987).
N. I. Shakura and R. A. Sunyaev, Astron. Astrophys. 24, 337 (1973).
J. Wambsganss, H. J. Witt, and P. Schneider, Astron. Astrophys. 258, 591 (1992).
P. R. Wozniak, C. Alard, A. Udalski, et al., Astrophys. J. 529, 88 (2000).
J. S. B. Wyithe, E. L. Turner, and R. L. Webster, astro-ph/0001307 (2000).
J. S. B. Wyithe, R. L. Webster, and E. L. Turner, Mon. Not. R. Astron. Soc. 309, 261 (1999).
A. F. Zakharov, Gravitational Lenses and Microlenses (Yanus, Moscow, 1997).
A. F. Zakharov and M. V. Sazhin, Usp. Fiz. Nauk 168, 1041 (1998) [Phys. Usp. 41, 945 (1998)].
Author information
Authors and Affiliations
Additional information
__________
Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 27, No. 3, 2001, pp. 180–186.
Original Russian Text Copyright © 2001 by Shalyapin.
Rights and permissions
About this article
Cite this article
Shalyapin, V.N. Caustic crossing in the gravitational lens Q2237+0305. Astron. Lett. 27, 150–155 (2001). https://doi.org/10.1134/1.1351558
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/1.1351558