- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
University of Chicago
2022-2023
Abstract We have digitized 24 spectrograms from the 1928 to 1930 eclipse of ϵ Aurigae, a binary system that has generated extensive investigation due its long 27.1 yr period and enigmatic secondary, which is completely obscured. The we comprise earliest campaign undertaken by Yerkes Observatory astronomers record an Aurigae. In this article, describe our methods digitization compare data with more contemporary spectrogram digitizations. This work demonstrates quality scientific extracted...
Abstract We report the discovery of COOL J0335−1927, a quasar at z = 3.27 lensed into three images with maximum separation 23.″3 by galaxy cluster 0.4178. To date, this is highest redshift wide-separation known. In addition, J0335−1927 shows several strong intervening absorbers visible in spectra all varying equivalent widths. The also mini-broad line absorption. construct parametric gravitational lens model using ground-based imaging, constrained and positions as well other multiply imaged...
Abstract In the second paper in this series, we improve on our previous demonstration of ability a commercially available graphic arts scanner and cost-effective analysis tools to produce scientifically useful scans astronomical photographic plates. We describe method using freely extract magnitude measurements from star images sky-survey plates, such as are stored observatory archives around world. detail use one plate particular, Plate 8 E. Barnard’s A Photographic Atlas Selected Regions...
Wide-separation lensed quasars (WSLQs) are a rare class of strongly quasars, magnified by foreground massive galaxy clusters, with typically large magnifications the multiple quasar images. They relatively unexplored opportunity for detailed study host galaxies. The current small sample known WSLQs has median redshift $z\approx 2.1$, larger than most other samples galaxies studied to date. Here, we derive precise constraints on properties six and their galaxies, using parametric surface...
We report the discovery of COOL J0335$-$1927, a quasar at z = 3.27 lensed into three images with maximum separation 23.3" by galaxy cluster 0.4178. To date this is highest redshift wide-separation known. In addition, J0335$-$1927 shows several strong intervening absorbers visible in spectra all varying equivalent width. The also mini-broad line absorption. construct parametric gravitational lens model using ground-based imaging, constrained and positions as well other multiply-imaged...