Author

D. Wittman

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Preprint Sep 2026

Toward Detecting the Moving Lens Effect with Optical Spectroscopy

Relativity predicts that sky-plane motion of a gravitational lens changes the wavelengths of lensed photons. This moving lens effect is orders of magnitude smaller than cosmological and Doppler effects on the same photons, but can be isolated by comparing different strongly lensed images of a given source. With a massi...

D. Wittman, R. Stancioli, Christopher Hopp · 0 citations

Preprint Oct 2026

Exemplary Merging Clusters II: XMM-Newton and Chandra X-ray Observations of MACS J1752.0+4440 and ZwCl 1856.8+6616

Using deep XMM-Newton and Chandra observations, we compare the double-radio-relic galaxy cluster mergers MACS J1752.0+4440 and ZwCl 1856.8+6616. Both are 1:1 mass-ratio mergers with similar relic separations but differing nearly an order of magnitude in total mass. In MACS J1752.0+4440, the surface-brightness discontin...

K. HyeongHan, K. Finner, W. Lee et al. · 0 citations