TDCOSMO: II. Six new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2 m telescope

Millon, M.; Courbin, F.; Bonvin, V.; Buckley-Geer, E.; Fassnacht, C.D.; Frieman, J.; Marshall, P.J.; Suyu, S.H.; Treu, T.; Anguita, T.; Motta, V.; Agnello, A.; Chan, J.H.H.; Chao, D.C.-Y.; Chijani, M.; Gilman, D.; Gilmore, K.; Lemon, C.; Lucey, J.R.; Melo, A.; Paic, E.; Rojas, K.; Sluse, D.; Williams, P.R.; Hempel, A.; Kim, S.; Lachaume, R.; Rabus, M.

doi:10.1051/0004-6361/202038698

TDCOSMO: II. Six new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2 m telescope

Millon, M.; Courbin, F.; Bonvin, V.; Buckley-Geer, E.; Fassnacht, C.D.; Frieman, J.; Marshall, P.J.; Suyu, S.H.; Treu, T.; Anguita, T.; Motta, V.; Agnello, A.; Chan, J.H.H.; Chao, D.C.-Y.; Chijani, M.; Gilman, D.; Gilmore, K.; Lemon, C.; Lucey, J.R.; Melo, A.; Paic, E.; Rojas, K.; Sluse, D.; Williams, P.R.; Hempel, A.; Kim, S.; Lachaume, R.; Rabus, M.

Authors

M. Millon

F. Courbin

V. Bonvin

E. Buckley-Geer

C.D. Fassnacht

J. Frieman

P.J. Marshall

S.H. Suyu

T. Treu

T. Anguita

V. Motta

A. Agnello

J.H.H. Chan

D.C.-Y. Chao

M. Chijani

D. Gilman

K. Gilmore

C. Lemon

Dr John Lucey john.lucey@durham.ac.uk
Emeritus Professor

A. Melo

E. Paic

K. Rojas

D. Sluse

P.R. Williams

A. Hempel

S. Kim

R. Lachaume

M. Rabus

Abstract

We present six new time-delay measurements obtained from Rc-band monitoring data acquired at the Max Planck Institute for Astrophysics (MPIA) 2.2 m telescope at La Silla observatory between October 2016 and February 2020. The lensed quasars HE 0047−1756, WG 0214−2105, DES 0407−5006, 2M 1134−2103, PSJ 1606−2333, and DES 2325−5229 were observed almost daily at high signal-to-noise ratio to obtain highquality light curves where we can record fast and small-amplitude variations of the quasars. We measured time delays between all pairs of multiple images with only one or two seasons of monitoring with the exception of the time delays relative to image D of PSJ 1606−2333. The most precise estimate was obtained for the delay between image A and image B of DES 0407−5006, where τAB = −128.4 +3.5 −3.8 d (2.8% precision) including systematics due to extrinsic variability in the light curves. For HE 0047−1756, we combined our high-cadence data with measurements from decade-long light curves from previous COSMOGRAIL campaigns, and reach a precision of 0.9 d on the final measurement. The present work demonstrates the feasibility of measuring time delays in lensed quasars in only one or two seasons, provided high signal-to-noise ratio data are obtained at a cadence close to daily.

Citation

Millon, M., Courbin, F., Bonvin, V., Buckley-Geer, E., Fassnacht, C., Frieman, J., …Rabus, M. (2020). TDCOSMO: II. Six new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2 m telescope. Astronomy & Astrophysics, 642, Article A193. https://doi.org/10.1051/0004-6361/202038698

Journal Article Type	Article
Acceptance Date	Aug 21, 2020
Online Publication Date	Oct 20, 2020
Publication Date	2020-10
Deposit Date	Nov 11, 2020
Publicly Available Date	Nov 11, 2020
Journal	Astronomy and astrophysics.
Print ISSN	0004-6361
Electronic ISSN	1432-0746
Publisher	EDP Sciences
Peer Reviewed	Peer Reviewed
Volume	642
Article Number	A193
DOI	https://doi.org/10.1051/0004-6361/202038698

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Copyright Statement
Millon, M., Courbin, F., Bonvin, V., Buckley-Geer, E., Fassnacht, C. D., Frieman, J., Marshall, P. J., Suyu, S. H., Treu, T., Anguita, T., Motta, V., Agnello, A., Chan, J. H. H., Chao, D. C.-Y., Chijani, M., Gilman, D., Gilmore, K., Lemon, C., Lucey, J. R., Melo, A., Paic, E., Rojas, K., Sluse, D., Williams, P. R., Hempel, A., Kim, S., Lachaume, R. & Rabus, M. (2020). TDCOSMO: II. Six new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2 m telescope. Astronomy & Astrophysics 642: A193 reproduced with permission, © ESO.