Large-distance lens uncertainties and time-delay measurements of H0
نویسندگان
چکیده
منابع مشابه
A Determination of H0 with the CLASS Gravitational Lens B1608+656: I. Time Delay Measurements with the VLA
We present the results of a program to monitor the four-image gravitational lens B1608+656 with the VLA. The system was observed over a seven month period from 1996 October to 1997 May. The 64 epochs of observation have an average spacing of 3.6 d. The light curves of the four images of the background source show that the flux density of the background source has varied at the∼5% level. We meas...
متن کاملA Determination of with the Class Gravitational Lens B1608]656. I. Time Delay H0 Measurements with the Vla1
We present the results of a program to monitor the four-image gravitational lens B1608]656 with the VLA. The system was observed over a 7 month period from 1996 October to 1997 May. The 64 epochs of observation have an average spacing of 3.6 days. The light curves of the four images of the background source show that the Ñux density of the background source has varied at the D5% level. We measu...
متن کاملA New Mass Degeneracy in Gravitational Lenses: Is There a Crisis between a Large H0 and the Time Delay by a Large Lens Halo?
Isothermal models and other simple smooth models of dark matter halos of gravitational lenses often predict a dimensionless time delay H0∆t much too small to be comfortable with the observed time delays ∆t and the widely accepted H0 value (∼ 70 km/s/Mpc). This conflict or crisis of the CDM has been highlighted by several recent papers of Kochanek, who claims that the standard value of H0 favors...
متن کاملA Determination of H0 with the CLASS Gravitational Lens B1608+656: III. A Significant Improvement in the Precision of the Time Delay Measurements
The gravitational lens CLASS B1608+656 is the only four-image lens system for which all three independent time delays have been measured. This makes the system an excellent candidate for a high-quality determination of H0 at cosmological distances. However, the original measurements of the time delays had large (12–20%) uncertainties, due to the low level of variability of the background source...
متن کاملFinite time stabilization of time-delay nonlinear systems with uncertainty and time-varying delay
In this paper, the problem of finite-time stability and finite-time stabilization for a specific class of dynamical systems with nonlinear functions in the presence time-varying delay and norm-bounded uncertainty terms is investigated. Nonlinear functions are considered to satisfy the Lipchitz conditions. At first, sufficient conditions to guarantee the finite-time stability for time-delay nonl...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2017
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.96.103537