Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.2228....1g&link_type=abstract
The Astronomer's Telegram, #2228
Astronomy and Astrophysics
Astronomy
2
Optical, Request For Observations, Agn, Quasars, Transients
Scientific paper
The gravitationally lensed quasar Q0957+561 (RA=10:01:20.78, Dec=+55:53:49.4) consists of two images of the same distant source at z=1.41. These images Q0957+561A and Q0957+561B are separated by about 6 arcsec. From a long-term optical monitoring campaign with the 2.0 m Liverpool Robotic Telescope, we found that the g-band flux of the leading image Q0957+561A increases 30% just after a deep minimum, i.e., it changes from g~17.45 to g~17.15 over about 130 days. Taking the time delay of about 14 months into account, it is expected a similar g-band brightening of the trailing image Q0957+561B in the first semester of 2010, starting in early February and reaching its maximum in June. Thus, a multiwavelength (X-ray, UV, optical, IR and radio) follow-up of this system over the next months offers a unique opportunity to study the variability mechanism of the distant source.
Goicoechea Luis Julian
Shalyapin Vyacheslav N.
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