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Robust Strong Lensing Time Delay Estimation

Alireza Hojjati
(
- Ewha Women's U., Seoul
)
,
Alex G. Kim
(
- LBL, Berkeley
)
,
Eric V. Linder
(
- LBL, Berkeley and
- BCCP, Berkeley and
- Ewha Women's U., Seoul
)

Apr 1, 2013

6 pages

Published in:

Phys.Rev.D 87 (2013) 12, 123512

Published: Jun 14, 2013

e-Print:

1304.0309 [astro-ph.CO]

DOI:

10.1103/PhysRevD.87.123512

View in:

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Abstract: (APS)

Strong gravitational lensing of time variable sources such as quasars and supernovae creates observable time delays between the multiple images. Time delays can provide a powerful cosmographic probe through the “time-delay distance” involving the ratio of lens, source, and lens-source distances. However, light curves of lensed images have measurement gaps, noise, systematics such as microlensing from substructure along an image line of sight, and no a priori functional model, making robust time-delay estimation challenging. Using Gaussian process techniques, we demonstrate success in accurate blind reconstruction of time delays and reduction in uncertainties for real data.

Note:

6 pages, 3 figures; v2 improved results using damped random walk kernel, matches PRD version

98.80.-k
95.30.Sf
gravitation: lens
time delay
supernova
structure
quasar
noise
gap
numerical calculations

References(28)

Figures(4)

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