2008A&A...480..647E


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.22CEST00:22:34

2008A&A...480..647E - Astronomy and Astrophysics, volume 480, 647-661 (2008/3-4)

Microlensing variability in the gravitationally lensed quasar. QSO 2237+0305 = the Einstein Cross. I. Spectrophotometric monitoring with the VLT.

EIGENBROD A., COURBIN F., SLUSE D., MEYLAN G. and AGOL E.

Abstract (from CDS):

We present the results of the first long-term (2.2-years) spectroscopic monitoring of a gravitationally lensed quasar, namely the Einstein Cross QSO 2237+0305. The goal of this paper is to present the observational facts to be compared in follow-up papers with theoretical models to constrain the inner structure of the source quasar. We spatially deconvolve deep VLT/FORS1 spectra to accurately separate the spectrum of the lensing galaxy from the spectra of the quasar images. Accurate cross-calibration of the 58 observations at 31-epoch from October 2004 to December 2006 is carried out with non-variable foreground stars observed simultaneously with the quasar. The quasar spectra are further decomposed into a continuum component and several broad emission lines to infer the variations of these spectral components. We find prominent microlensing events in the quasar images A and B, while images C and D are almost quiescent on a timescale of a few months. The strongest variations are observed in the continuum of image A. Their amplitude is larger in the blue (0.7mag) than in the red (0.5mag), consistent with microlensing of an accretion disk. Variations in the intensity and profile of the broad emission lines are also reported, most prominently in the wings of the CIII and center of the CIV emission lines. During a strong microlensing episode observed in June 2006 in quasar image A, the broad component of the CIII is more highly magnified than the narrow component. In addition, the emission lines with higher ionization potentials are more magnified than the lines with lower ionization potentials, consistent with the results obtained with reverberation mapping. Finally, we find that the V-band differential extinction by the lens, between the quasar images, is in the range 0.1-0.3mag.

Abstract Copyright:

Journal keyword(s): gravitational lensing - galaxies: quasars: general - galaxies: quasars: emission line - quasars: individual: QSO 2237+0305, Einstein Cross

Simbad objects: 24

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Number of rows : 24

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 CD-34 239 PM* 00 41 30.4742099792 -33 37 32.032402561 13.138 11.969 10.525 9.619 8.741 K9V 101 0
2 [VV2006] J005027.8-174009 QSO 00 50 27.8233602592 -17 40 09.171002680           ~ 42 1
3 CD-28 595 PM* 01 54 50.2704861570 -27 28 35.740415025   12.06 11.51     ~ 123 0
4 LP 995-86 PM* 03 48 22.6125635562 -39 08 37.013516494   13.61 13.15     F 92 0
5 [VV2006] J043814.8-122314 QSO 04 38 14.88 -12 17 14.6     17.15     ~ 190 2
6 HD 49798 HXB 06 48 04.7000758397 -44 18 58.432035331 6.758 8.017 8.287 8.391 8.543 sdO6 289 0
7 QSO B0908+0603 QSO 09 11 27.6052 +05 50 54.281   18.44 18.16     ~ 216 2
8 QSO J0924+0219 QSO 09 24 55.8048 +02 19 24.850   18.58 18.36     ~ 113 1
9 [VV98] J095122.6+263513 QSO 09 51 22.5840 +26 35 13.786   17.66 17.31     ~ 97 1
10 GD 108 HS* 10 00 47.2462037648 -07 33 30.777365253 12.406 13.349 13.563 13.662 13.781 sdB 132 1
11 QSO B1001+4127 QSO 10 04 34.9236085542 +41 12 42.771226567   19.14 19.03     ~ 171 1
12 QSO B1104-181 QSO 11 06 33.39 -18 21 23.8   15.8 15.9 15.7   ~ 308 1
13 QSO J1131-1231 QSO 11 31 51.5387 -12 31 58.716           ~ 232 1
14 QSO J1415+1129 QSO 14 15 46.25 +11 29 43.4   17.63 17.23     ~ 608 0
15 QSO B1520+530 QSO 15 21 44.8 +52 54 49   18.2       ~ 118 2
16 QSO B1600+4344 QSO 16 01 40.4818 +43 16 47.394   22.12 21.92     ~ 178 1
17 CD-30 17706 WD* 20 10 56.8485174654 -30 13 06.629141494 11.654 12.286 12.242 12.311 12.381 DA3.1 227 0
18 QSO B2149-2745 QSO 21 52 07.4534 -27 31 49.718   18.70 18.39     ~ 98 2
19 QSO J2240+0321 QSO 22 40 30.234 +03 21 30.63           ~ 650 1
20 Z 378-15 G 22 40 30.23447 +03 21 30.6290           ~ 629 0
21 QSO B2237+0305D LeI 22 40 30.28 +03 21 29.3   18.98       ~ 76 0
22 QSO B2237+0305B LeI 22 40 30.30 +03 21 30.5   17.82       ~ 76 0
23 QSO B2237+0305A LeI 22 40 30.34 +03 21 28.8   17.96       ~ 88 0
24 QSO B2237+0305C LeI 22 40 30.38 +03 21 30.0   18.66       ~ 79 0

    Equat.    Gal    SGal    Ecl

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2021.06.22-00:22:34

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