COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses
F. CourbinInstitute of Physics, Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, SwitzerlandV. BonvinInstitute of Physics, Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, SwitzerlandE. Buckley‐GeerFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAC. D. FassnachtDepartment of Physics, University of California, Davis, CA 95616, USAJ. FriemanFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAH. LinFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAPhilip J. MarshallKavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USAS. H. SuyuInstitute of Astronomy and Astrophysics, Academia Sinica, PO Box 23-141, 10617 Taipei, Taiwan, PR ChinaTommaso TreuDepartment of Physics and Astronomy, University of California, Los Angeles, CA 90095, USAT. AnguitaDepartamento de Ciencias Físicas, Universidad Andres Bello Fernandez Concha 700, Las Condes, Santiago, ChileV. MottaInstituto de Física y Astronomía, Universidad de Valparaíso, Avda. Gran Bretaña 1111, Playa Ancha, 2360102 Valparaíso, ChileG. MeylanInstitute of Physics, Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, SwitzerlandE. PaicInstitute of Physics, Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, SwitzerlandM. TewesAdriano AgnelloEuropean Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei Munchen, GermanyD. C.-Y. ChaoMax Planck Institute for Astrophysics, Karl-Schwarzschild-Strasse 1, 85740 Garching, GermanyM. ChijaniDepartamento de Ciencias Físicas, Universidad Andres Bello Fernandez Concha 700, Las Condes, Santiago, ChileDaniel GilmanDepartment of Physics and Astronomy, University of California, Los Angeles, CA 90095, USAK. RojasInstituto de Física y Astronomía, Universidad de Valparaíso, Avda. Gran Bretaña 1111, Playa Ancha, 2360102 Valparaíso, ChileP. R. WilliamsDepartment of Physics and Astronomy, University of California, Los Angeles, CA 90095, USAA. HempelDepartamento de Ciencias Físicas, Universidad Andres Bello Fernandez Concha 700, Las Condes, Santiago, ChileS. KimCentro de Astroingeniería, Facultad de Física, Pontificia Universidad Católica deChile, Av. Vicuña Mackenna 4860, Macul 7820436, Santiago, ChileR. LachaumeCentro de Astroingeniería, Facultad de Física, Pontificia Universidad Católica deChile, Av. Vicuña Mackenna 4860, Macul 7820436, Santiago, ChileM. RabusCentro de Astroingeniería, Facultad de Física, Pontificia Universidad Católica deChile, Av. Vicuña Mackenna 4860, Macul 7820436, Santiago, ChileT. M. C. AbbottCerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, ChileS. AllamFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAJ. AnnisFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAM. BanerjiInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UKK. BechtolLSST, 933 North Cherry Avenue, Tucson, AZ 85721, USAA. Benoit-LévyCNRS, UMR 7095, Institut d’Astrophysique de Paris, 75014 Paris, FranceDavid BrooksDepartment of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT, UKD. L. BurkeKavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USAA. Carnero RosellLaboratório Interinstitucional de e-Astronomia – LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ – 20921-400, BrazilM. Carrasco KindDepartment of Astronomy, University of Illinois, 1002 W. Green Street, Urbana, IL 61801, USAJ. CarreteroInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra (Barcelona), SpainC. B. D’AndreaDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USAL. N. da CostaLaboratório Interinstitucional de e-Astronomia – LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ – 20921-400, BrazilC. DavisKavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USAD. L. DePoyGeorge P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USAS. DesaiDepartment of Physics, IIT Hyderabad, Kandi, Telangana 502285, IndiaB. FlaugherFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAP. FosalbaInstitut de Ciències de l’Espai, IEEC-CSIC, Campus UAB, Carrer de Can Magrans, s/n, 08193 Bellaterra, Barcelona, SpainJ. García-BellidoInstituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, 28049 Madrid, SpainE. GaztañagaInstitut de Ciències de l’Espai, IEEC-CSIC, Campus UAB, Carrer de Can Magrans, s/n, 08193 Bellaterra, Barcelona, SpainD. A. GoldsteinDepartment of Astronomy, University of California, Berkeley, 501 Campbell Hall, Berkeley, CA 94720, USAD. GruenKavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USAR. A. GruendlDepartment of Astronomy, University of Illinois, 1002 W. Green Street, Urbana, IL 61801, USAJ. GschwendLaboratório Interinstitucional de e-Astronomia – LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ – 20921-400, BrazilG. GutiérrezFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAK. HonscheidCenter for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USAD. J. JamesAstronomy Department, University of Washington, Box 351580, Seattle, WA 98195, USAK. KuehnAustralian Astronomical Observatory, North Ryde, NSW 2113, AustraliaS. KuhlmannArgonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USAN. KuropatkinFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAO. LahavDepartment of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT, UKM. LimaDepartamento de Física Matemática, Instituto de Física, Universidade de São Paulo, CP 66318, São Paulo, SP, 05314-970, BrazilM. A. G. MaiaLaboratório Interinstitucional de e-Astronomia – LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ – 20921-400, BrazilM. MarchDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USAJ. L. MarshallGeorge P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USAR. G. McMahonInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UKF. MenanteauDepartment of Astronomy, University of Illinois, 1002 W. Green Street, Urbana, IL 61801, USAR. MiquelInstitució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, SpainB. NordFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAA. A. PlazasJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USAE. SánchezCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, SpainV. ScarpineFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAR. SchindlerSLAC National Accelerator Laboratory, Menlo Park, CA 94025, USAM. SchubnellDepartment of Physics, University of Michigan, Ann Arbor, MI 48109, USAI. Sevilla-NoarbeCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, SpainM. SmithSchool of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UKM. Soares-SantosFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAF. SobreiraInstituto de Física Gleb Wataghin, Universidade Estadual de Campinas, 13083-859 Campinas, SP, BrazilE. SuchytaComputer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USAG. TarléDepartment of Physics, University of Michigan, Ann Arbor, MI 48109, USAD. L. TuckerFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAA. R. WalkerCerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, ChileW. C. WesterFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA
2017en
ABI
Аннотация
We present time-delay measurements for the new quadruple imaged quasar DES J0408−5354, the first quadruple imaged quasar found in the Dark Energy Survey (DES). Our result is made possible by implementing a new observational strategy using almost daily observations with the MPIA 2.2 m telescope at La Silla observatory and deep exposures reaching a signal-to-noise ratio of about 1000 per quasar image. This data qualityallows us to catch small photometric variations (a few mmag rms) of the quasar, acting on temporal scales much shorter than microlensing, and hence making the time delay measurement very robust against microlensing. In only seven months we very accurately measured one of the time delays in DES J0408−5354: Δ t (AB) = −112.1 ± 2.1 days (1.8%) using only the MPIA 2.2 m data. In combination with data taken with the 1.2 m Euler Swiss telescope, we also measured two delays involving the D component of the system Δ t (AD) = −155.5 ± 12.8 days (8.2%) and Δ t (BD) = −42.4 ± 17.6 days (41%), where all the error bars include systematics. Turning these time delays into cosmological constraints will require deep Hubble Space Telescope (HST) imaging or ground-based adaptive optics (AO), and information on the velocity field of the lensing galaxy.
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