1996A&A...309...59O

Query : 1996A&A...309...59O

1996A&A...309...59O - Astronomy and Astrophysics, volume 30959-64 (1996/5-1)

Monitoring of the Einstein Cross with the Nordic Optical Telescope.

OSTENSEN R., REFSDAL S., STABELL R., TEUBER J., EMANUELSEN P.I., FESTIN L., FLORENTIN-NIELSEN R., GAHM G., GULLBRING E., GRUNDAHL F., HJORTH J., JABLONSKI M., JAUNSEN A.O., KAAS A.A., KARTTUNEN H., KOTILAINEN J., LAURIKAINEN E., LINDGREN H., MAEHOENEN P., NILSSON K., OLOFSSON G., OLSEN O., PETTERSEN B.R., PIIROLA V., SORENSEN A.N., TAKALO L., THOMSEN B., VALTAOJA E., VESTERGAARD M. and AV VIANBORG T.

Abstract (from CDS):

We report results from five years of monitoring of the Einstein Cross (QSO 2237+0305) with the Nordic Optical Telescope. The photometry, mainly in the R and I bands, has been performed by a PSF fitting and 'cleaning' procedure, in which the four image components as well as the host galaxy and its nucleus are iteratively removed. The resulting lightcurves exhibit several microlensing features; one event may have a timescale as short as 14days. Variations on timescales of several years are found in all four images. This becomes even more convincing when our data are combined with data published for 1986-89. No clear high amplification event was observed during the period. A brightening of all four components during 1994 is interpreted as intrinsic variation.

Abstract Copyright: ∼

Journal keyword(s): gravitational lensing - techniques: image processing - quasars: individual: Q 2237+0305

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 QSO B0142-100 QSO 01 45 16.5958283760 -09 45 17.265131352   17.23 16.95     ~ 247 1
2 8C 0958+561 QSO 10 01 20.6918953728 +55 53 55.593949272   17.16 16.95     ~ 757 3
3 QSO J1415+1129 QSO 14 15 46.25 +11 29 43.4   17.63 17.23     ~ 678 0
4 QSO J2240+0321 QSO 22 40 30.234 +03 21 30.63           ~ 705 1
5 Z 378-15 AGN 22 40 30.23447 +03 21 30.6290           ~ 636 0

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