Kavli Affiliate: Alexander P. Ji | First 5 Authors: SDSS Collaboration, SDSS Collaboration, , , | Summary: Mapping the local and distant Universe is key to our understanding of it. For decades, the Sloan Digital Sky Survey (SDSS) has made a concerted effort to map millions of celestial objects to constrain the physical processes that […]
Kavli Affiliate: Michael D. Gladders | First 5 Authors: Michelle A. Berg, Michelle A. Berg, , , | Summary: Gravitational lensing has transformed the field of gas tomography in the intergalactic medium (IGM) and circumgalactic medium (CGM). Here we use the brightest lensed galaxy identified to date, the Sunburst Arc ($z$$approx$2.37), to constrain the physical […]
Kavli Affiliate: Joshua A. Frieman | First 5 Authors: Anowar J. Shajib, Anowar J. Shajib, , , | Summary: The spectral resolution ($R equiv lambda / Delta lambda$) of spectroscopic data is crucial information for accurate kinematic measurements. In this letter, we present a robust measurement of the spectral resolution for the JWST’s Near Infrared […]
Kavli Affiliate: Andrey Kravtsov | First 5 Authors: Vance Wheeler, Vance Wheeler, , , | Summary: We use intergalactic medium (IGM) metallicity distributions from several state-of-the-art cosmological simulations of Milky Way analogs and a semi-analytic model of ultra-faint dwarf galaxy (UFD) formation to model the stellar metallicities of UFDs in MW-like environments. We study simulations […]
Kavli Affiliate: Lindsey Bleem | First 5 Authors: Ryan Walker, Ryan Walker, , , | Summary: A wide range of scientific imaging datasets benefit from human inspection for purposes ranging from prosaic-such as fault identification and quality inspection-to profound, enabling the discovery of new phenomena. As such, these datasets come in a wide variety of […]
Kavli Affiliate: Wayne Hu | First 5 Authors: Keisuke Harigaya, Wayne Hu, Rayne Liu, Huangyu Xiao, | Summary: We show that enhancement of the axion relic abundance compared to the standard misalignment contribution generically leads to the production of nonzero momentum axion modes, resulting in warm dark matter behavior and enhanced isocurvature perturbations. It leads […]
Kavli Affiliate: Daniel E. Holz | First 5 Authors: Lei Hu, Tomás Cabrera, Antonella Palmese, James Freeburn, Mattia Bulla | Summary: Gravitational wave (GW) neutron star mergers with an associated electromagnetic counterpart constitute powerful probes of binary evolution, the production sites of heavy elements, general relativity, and the expansion of the universe. Only a handful […]
Kavli Affiliate: Emil J. Martinec | First 5 Authors: Andrea Dei, Emil J. Martinec, , , | Summary: We formulate a worldsheet description of string theory in the background of a single decoupled NS5-brane, which is a particularly simple example of “little string” holography. The worldsheet theory involves a gauged Wess-Zumino-Witten model for the group […]
Kavli Affiliate: Joshua A. Frieman | First 5 Authors: Anowar J. Shajib, Tommaso Treu, Sherry H. Suyu, David Law, Akın Yıldırım | Summary: Spatially resolved stellar kinematics has become a key ingredient in time-delay cosmography to break the mass-sheet degeneracy in the mass profile and, in turn, provide a precise constraint on the Hubble constant […]
Kavli Affiliate: Alexander P. Ji | First 5 Authors: Benjamin Cohen, Alexander P. Ji, Peter S. Ferguson, Sergey E. Koposov, Alex Drlica-Wagner | Summary: Stellar streams are sensitive laboratories for understanding the small-scale structure in our Galaxy’s gravitational field. Here, we analyze the morphology of the $300S$ stellar stream, which has an eccentric, retrograde orbit […]