Gravitationally Lensed QSOs: Optical Monitoring with the EOCA and the Liverpool Telescope (LT)
msra(2006)
摘要
The aim of this contribution is to present the two first phases of the
optical monitoring programme of the Gravitational Lenses group at the
Universidad de Cantabria (GLUC, http://grupos.unican.es/glendama/). In an
initial stage (2003 March-June), the Estacion de Observacion de Calar Alto
(EOCA) was used to obtain VR frames of SBS 0909+532 and QSO 0957+561. These
observations in 2003 led to accurate fluxes of the two components of both
double QSOs, which are being compared and complemented with data from other
1-1.5 m telescopes located in the North Hemisphere: Fred Lawrence Whipple
Observatory (USA), Maidanak Observatory (Uzbekistan) and Wise Observatory
(Israel). On the other hand, the GLUC started the second phase of its
monitoring programme in 2005 January. In this second phase, they are using the
2 m fully robotic Liverpool Telescope (LT). The key idea is the two-band
photometric follow-up of four lensed QSOs with different main lensing galaxies:
SBS 0909+532 (elliptical), QSO 0957+561 (giant cD), B1600+434 (edge-on spiral)
and QSO 2237+0305 (face-on spiral). Thus, the light rays associated with the
components of the four gravitational mirages cross different galaxy
environments, and the corresponding light curves could unveil the content of
these environments. While SBS 0909+532 and QSO 0957+561 are the targets for the
two first years with the LT (2005-2006), the rest of targets (B1600+434 and QSO
2237+0305) will be monitored starting from 2007.
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关键词
gravitational lensing
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