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COSMOGRAIL: The cosmological monitoring of gravitational lenses

COSMOGRAIL: The cosmological monitoring of gravitational lenses
COSMOGRAIL: The cosmological monitoring of gravitational lenses

We present time-delay measurements for the new quadruple imaged quasar DES J04085354, 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 J04085354: - "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 - "t(AD) = ± 12.8 days (8.2%) and - "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.

cosmological parameters, data analysis, gravitational lensing, methods, strong
0004-6361
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Courbin, F., Bonvin, V., Buckley-Geer, E., Fassnacht, C. D., Frieman, J., Lin, H., Marshall, P. J., Suyu, S. H., Treu, T., Anguita, T., Motta, V., Meylan, G., Paic, E., Tewes, M., Agnello, A., Chao, D. C.Y., Chijani, M., Gilman, D., Rojas, K., Williams, P., Hempel, A., Kim, S., Lachaume, R., Rabus, M., Abbott, T. M.C., Allam, S., Annis, J., Banerji, M., Bechtol, K., Benoit-Lévy, A., Brooks, D., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., D'Andrea, C. B., Da Costa, L. N., Davis, C., Depoy, D. L., Desai, S., Flaugher, B., Fosalba, P., García-Bellido, J., Gaztanaga, E., Goldstein, D. A., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Honscheid, K., James, D. J., Kuehn, K., Kuhlmann, S., Kuropatkin, N., Lahav, O., Lima, M., Maia, M. A.G., March, M., Marshall, J. L., McMahon, R. G., Menanteau, F., Miquel, R., Nord, B., Plazas, A. A., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Suchyta, E., Tarle, G., Tucker, D. L., Walker, A. R. and Wester, W. (2018) COSMOGRAIL: The cosmological monitoring of gravitational lenses. Astronomy & Astrophysics, 609. (doi:10.1051/0004-6361/201731461).

Record type: Article

Abstract

We present time-delay measurements for the new quadruple imaged quasar DES J04085354, 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 J04085354: - "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 - "t(AD) = ± 12.8 days (8.2%) and - "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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Accepted/In Press date: 5 October 2017
e-pub ahead of print date: 9 January 2018
Published date: January 2018
Keywords: cosmological parameters, data analysis, gravitational lensing, methods, strong

Identifiers

Local EPrints ID: 417333
URI: https://eprints.soton.ac.uk/id/eprint/417333
ISSN: 0004-6361
PURE UUID: b63aee01-bd29-46d9-ab29-f3904c4652b6

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Date deposited: 30 Jan 2018 17:30
Last modified: 14 Aug 2018 16:31

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Contributors

Author: F. Courbin
Author: V. Bonvin
Author: E. Buckley-Geer
Author: C. D. Fassnacht
Author: J. Frieman
Author: H. Lin
Author: P. J. Marshall
Author: S. H. Suyu
Author: T. Treu
Author: T. Anguita
Author: V. Motta
Author: G. Meylan
Author: E. Paic
Author: M. Tewes
Author: A. Agnello
Author: D. C.Y. Chao
Author: M. Chijani
Author: D. Gilman
Author: K. Rojas
Author: P. Williams
Author: A. Hempel
Author: S. Kim
Author: R. Lachaume
Author: M. Rabus
Author: T. M.C. Abbott
Author: S. Allam
Author: J. Annis
Author: M. Banerji
Author: K. Bechtol
Author: A. Benoit-Lévy
Author: D. Brooks
Author: D. L. Burke
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: J. Carretero
Author: C. B. D'Andrea
Author: L. N. Da Costa
Author: C. Davis
Author: D. L. Depoy
Author: S. Desai
Author: B. Flaugher
Author: P. Fosalba
Author: J. García-Bellido
Author: E. Gaztanaga
Author: D. A. Goldstein
Author: D. Gruen
Author: R. A. Gruendl
Author: J. Gschwend
Author: G. Gutierrez
Author: K. Honscheid
Author: D. J. James
Author: K. Kuehn
Author: S. Kuhlmann
Author: N. Kuropatkin
Author: O. Lahav
Author: M. Lima
Author: M. A.G. Maia
Author: M. March
Author: J. L. Marshall
Author: R. G. McMahon
Author: F. Menanteau
Author: R. Miquel
Author: B. Nord
Author: A. A. Plazas
Author: E. Sanchez
Author: V. Scarpine
Author: R. Schindler
Author: M. Schubnell
Author: I. Sevilla-Noarbe
Author: M. Smith
Author: M. Soares-Santos
Author: F. Sobreira
Author: E. Suchyta
Author: G. Tarle
Author: D. L. Tucker
Author: A. R. Walker
Author: W. Wester

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