COSMOGRAIL: XVII. Time delays for the quadruply imaged quasar PG 1115+080
| Autor: | Daniel Gilman, Joshua A. Frieman, Sherry H. Suyu, Seung-Lee Kim, M. Millon, Timo Anguita, E. Buckley-Geer, Veronica Motta, Tommaso Treu, Frederic Courbin, R. Lachaume, M. Chijani, K. Gilmore, Peter R. Williams, Malte Tewes, E. Paic, Markus Rabus, Vivien Bonvin, Geoff C. F. Chen, Pierre Magain, Philip J. Marshall, D. C. Y. Chao, Christopher D. Fassnacht, K. Rojas, A. Hempel, Georges Meylan, James H. H. Chan |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cosmological parameters FOS: Physical sciences Astrophysics Gravitational microlensing strong [Gravitational lensing] 01 natural sciences law.invention black-holes Telescope hubble constant Observatory law 0103 physical sciences he 0435-1223 gravitational lens des j0408-5354 cosmological parameters Adaptive optics data analysis [Methods] 010303 astronomy & astrophysics Physics 010308 nuclear & particles physics gravitational lensing: strong Astronomy and Astrophysics Quasar Light curve methods: data analysis Galaxy Gravitational lens x-ray Space and Planetary Science systems precision galaxy spectroscopic survey Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Astronomy and Astrophysics |
| Popis: | We present time-delay estimates for the quadruply imaged quasar PG 1115+080. Our resuls are based on almost daily observations for seven months at the ESO MPIA 2.2m telescope at La Silla Observatory, reaching a signal-to-noise ratio of about 1000 per quasar image. In addition, we re-analyse existing light curves from the literature that we complete with an additional three seasons of monitoring with the Mercator telescope at La Palma Observatory. When exploring the possible source of bias we consider the so-called microlensing time delay, a potential source of systematic error so far never directly accounted for in previous time-delay publications. In fifteen years of data on PG 1115+080, we find no strong evidence of microlensing time delay. Therefore not accounting for this effect, our time-delay estimates on the individual data sets are in good agreement with each other and with the literature. Combining the data sets, we obtain the most precise time-delay estimates to date on PG 1115+080, with Dt(AB) = 8.3+1.5-1.6 days (18.7% precision), Dt(AC) = 9.9+1.1-1.1 days (11.1%) and Dt(BC) = 18.8+1.6-1.6 days (8.5%). Turning these time delays into cosmological constraints is done in a companion paper that makes use of ground-based Adaptive Optics (AO) with the Keck telescope. 15 pages, 6 figures, submitted to A&A. Comments welcome |
| Databáze: | OpenAIRE |
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