2013
DOI: 10.1051/0004-6361/201118755
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Flux and color variations of the doubly imaged quasar UM673

Abstract: Aims. With the aim of characterizing the flux and color variations of the multiple components of the gravitationally lensed quasar UM673 as a function of time, we have performed multiepoch and multiband photometric observations with the Danish 1.54 m telescope at the La Silla Observatory. Methods. The observations were carried out in the VRi spectral bands during four seasons (2008)(2009)(2010)(2011). We reduced the data using the point spread function photometric technique as well as aperture photometry. Resu… Show more

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Cited by 6 publications
(7 citation statements)
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“…Such a behaviour has already been observed for the double quasar SBS 1520+530 by Gaynullina et al (2005). 2004), Pereyra et al (2006), Ricci et al (2011), andRicci et al (2013). The yearly averages of the colour are shown in Table 6.…”
Section: Time Delay For He 0047-1756supporting
confidence: 69%
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“…Such a behaviour has already been observed for the double quasar SBS 1520+530 by Gaynullina et al (2005). 2004), Pereyra et al (2006), Ricci et al (2011), andRicci et al (2013). The yearly averages of the colour are shown in Table 6.…”
Section: Time Delay For He 0047-1756supporting
confidence: 69%
“…light curve as a function of the MJD, shown in the upper part of Fig. 15, reveals that the two components span the highest colour variation of ≈ 0.07 mag between seasons 2008 and 2009, with both images turning bluer in correspondence to the 2009 brightening, as already observed by Vanden Berk et al (2004), Pereyra et al (2006), Ricci et al (2011), and Ricci et al (2013). The yearly averages of the colour are shown in Table 6.…”
Section: The Light Curve Of the Brightest Component A Is Linearly In-supporting
confidence: 62%
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“…The other possibility is to study the quasars in the strong lensing systems and remove any intrinsic variations in the light curve by shifting the light curves according to the time delay between the images [41]. This method in recent years is used for detecting microlensing signals in the geometric optics regime [46,62,63].…”
Section: Observational Prospect and Optical Depthmentioning
confidence: 99%
“…For the remaining more compact systems we performed a multiple PSF fitting analysis to precise their morphology (pointlike or extended source) and accurate magnitude measurement of each component. We adopted the same PSF fitting technique as that used for the analysis of the gravitational lens systems HE 0435-1223 described in Ricci et al (2011) and UM673 in Ricci et al (2013).…”
Section: The Sample Of Gravitational Lens Candidatesmentioning
confidence: 99%