Gregory Dobler

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Flux ratio ‘anomalies’ in quadruply-imaged gravitational lenses can be explained with galactic substructure of the sort predicted by ΛCDM, but the strength and uniqueness of that hypothesis needs to be further assessed. A good way to do that is to use the physical scale associated with the size of the source quasar, and its dependence on wavelength. We(More)
Given the number of recently discovered galaxy-galaxy lens systems, we anticipate that a gravitationally lensed supernova will be observed within the next few years. We explore the possibility that stars in the lens galaxy will produce observable microlensing fluctuations in lensed supernova light curves. For typical parameters, we predict that ∼70% of(More)
We characterize spinning dust emission in the warm ionized medium by comparing templates of Galactic dust and Hα with the 5-year maps from the Wilkinson Microwave Anisotropy Probe. The Hα-correlated microwave emission deviates from the thermal bremsstrahlung (free-free) spectrum expected for ionized gas, exhibiting an additional broad bump peaked at ∼ 40(More)
We present the results of the first strong lens time delay challenge. The motivation, experimental design, and entry level challenge are described in a companion paper. This paper presents the main challenge, TDC1, which consisted of analyzing thousands of simulated light curves blindly. The observational properties of the light curves cover the range in(More)
In most of the traffic safety studies, both the identification of high-risk locations and the assessment of safety improvement solutions are done through the use of historical crash data. This study proposes an alternative approach that makes use of traffic conflicts extracted from traffic video recordings for safety assessment. State-of-the-art computer(More)
CMB experiments commonly use maps of Hα intensity as a spatial template for Galactic free–free emission, assuming a power law Iν ∝ ν −0.15 for the spectrum. Any departure from the assumed free–free spectrum could have a detrimental effect on determination of the primary CMB anisotropy. We show that the Hα-correlated emission spectrum in the diffuse WIM is(More)