2008A&A...480..327A


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET02:26:55

2008A&A...480..327A - Astronomy and Astrophysics, volume 480, 327-334 (2008/3-3)

The multiple quasar Q2237+0305 under a microlensing caustic.

ANGUITA T., SCHMIDT R.W., TURNER E.L., WAMBSGANSS J., WEBSTER R.L., LOOMIS K.A., LONG D. and McMILLAN R.

Abstract (from CDS):

We use the high magnification event seen in the 1999 OGLE campaign light curve of image C of the quadruply imaged gravitational lens Q2237+0305 to study the structure of the quasar engine. We have obtained g'- and r'-band photometry at the Apache Point Observatory 3.5m telescope where we find that the event has a smaller amplitude in the r'-band than in the g'- and OGLE V-bands. By comparing the light curves with microlensing simulations we obtain constraints on the sizes of the quasar regions contributing to the g'- and r'-band flux. Assuming that most of the surface mass density in the central kiloparsec of the lensing galaxy is due to stars and by modeling the source with a Gaussian profile, we obtain for the Gaussian width 1.20x1015sqrt(M/0.1M)cm≲σg'≲7.96x1015sqrt(M/0.1M)cm, where M is the mean microlensing mass, and a ratio σr'g'=1.25+0.45–0.15. With the limits on the velocity of the lensing galaxy from Gil-Merino et al. (2005A&A...432...83G) as our only prior, we obtain 0.60x1015sqrt(M/0.1 M)cm≲σg'≲1.57x1015sqrt(M/0.1M)cm and a ratio σr'g'=1.45+0.90–0.25 (all values at 68 percent confidence). Additionally, from our microlensing simulations we find that, during the chromatic microlensing event observed, the continuum emitting region of the quasar crossed a caustic at ≥72 percent confidence.

Abstract Copyright:

Journal keyword(s): gravitational lensing - galaxies: quasars: individual: Q2237+0305 - cosmology: observations - accretion, accretion disks

CDS comments: Fig. Standard star not identified.

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO J2240+0321 QSO 22 40 30.234 +03 21 30.63           ~ 646 0
2 Z 378-15 G 22 40 30.23447 +03 21 30.6290           ~ 629 0
3 QSO B2237+0305B LeI 22 40 30.30 +03 21 30.5   17.82       ~ 76 0
4 QSO B2237+0305C LeI 22 40 30.38 +03 21 30.0   18.66       ~ 79 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-02:26:55

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