dc.contributor.author | Shalyapin, Vyacheslav | |
dc.contributor.author | Goicoechea Santamaría, Luis Julián | |
dc.contributor.author | Gil-Merino Rubio, Rodrigo | |
dc.contributor.other | Universidad de Cantabria | es_ES |
dc.date.accessioned | 2022-11-21T12:25:34Z | |
dc.date.available | 2022-11-21T12:25:34Z | |
dc.date.issued | 2012 | |
dc.identifier.issn | 0004-6361 | |
dc.identifier.issn | 1432-0746 | |
dc.identifier.other | AYA2007-67342-C03-02 | es_ES |
dc.identifier.other | AYA2010-21741-C03-03 | es_ES |
dc.identifier.uri | https://hdl.handle.net/10902/26521 | |
dc.description.abstract | New light curves of the gravitationally lensed double quasar Q0957+561 in the gr bands during 2008-2010 include densely sampled, sharp intrinsic fluctuations with unprecedentedly high signal-to-noise ratio. These relatively violent flux variations allow us to very accurately measure the g-band and r-band time delays between the two quasar images A and B. Using correlation functions, we obtain that the two time delays are inconsistent with each other at the 2σ level, with the r-band delay exceeding the 417-day delay in the g band by about 3 days. We also studied the long-term evolution of the delay-corrected flux ratio B/A from our homogeneous two-band monitoring with the Liverpool Robotic Telescope between 2005 and 2010. This ratio B/A slightly increases in periods of violent activity, which seems to be correlated with the flux level in these periods. The presence of the previously reported dense cloud within the cD lensing galaxy, along the line of sight to the A image, could account for the observed time delay and flux ratio anomalies | es_ES |
dc.description.sponsorship | We thank L. J. Hainline and C. W. Morgan for kind interactions regarding our respective pholometric approaches and data interpretations. The authors also thank the anonymous referee for valuable comments that improved the manuscript. We acknowledge the staff of the Liverpool Robotic Telescope (LRT) for their dedicated support and developmenl of the Phase 2. User interface, wich alows users to specify in detail the observations they wish the LRT to make. The LRT is operated on the islancl of La Palma by Liverpool John Moores University in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias with support from the K Science ancl Technology Facilities Council. This research has been supported by the Spanish Department of Science and lnnovation grants AYA2007-67342- C03-02 and AYA2010-21741-C03-03 (GLENDAMA Project),. and University of Cantabria funds. | |
dc.format.extent | 8 p. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | EDP Sciences | es_ES |
dc.rights | © ESO (2012) | es_ES |
dc.source | Astronomy and Astrophysics, 540, A132 (2012) | es_ES |
dc.subject.other | Gravitational lensing: strong | es_ES |
dc.subject.other | Quasars: individual: Q0957+561 | es_ES |
dc.subject.other | Galaxies: elliptical and lenticular, cD | es_ES |
dc.subject.other | Black hole physics | es_ES |
dc.title | A 5.5-year robotic optical monitoring of Q0957+561: Substructure in a non-local cD galaxy | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.relation.publisherVersion | https://doi.org/10.1051/0004-6361/201118316 | es_ES |
dc.rights.accessRights | openAccess | es_ES |
dc.identifier.DOI | 10.1051/0004-6361/201118316 | |
dc.type.version | publishedVersion | es_ES |