Search Publications
The Discovery of a Gravitationally Lensed Supernova Ia at Redshift 2.22
Stern, D.; Huang, X.; Amanullah, R. +33 more
We present the discovery and measurements of a gravitationally lensed supernova (SN) behind the galaxy cluster MOO J1014+0038. Based on multi-band Hubble Space Telescope and Very Large Telescope (VLT) photometry of the supernova, and VLT spectroscopy of the host galaxy, we find a 97.5% probability that this SN is a SN Ia, and a 2.5% chance of a CC…
Beta Dips in the Gaia Era: Simulation Predictions of the Galactic Velocity Anisotropy Parameter (β) for Stellar Halos
Bell, Eric F.; Hattori, Kohei; Quinn, Thomas R. +7 more
The velocity anisotropy parameter, β, is a measure of the kinematic state of orbits in the stellar halo, which holds promise for constraining the merger history of the Milky Way (MW). We determine global trends for β as a function of radius from three suites of simulations, including accretion-only and cosmological hydrodynamic simulations. We fin…
A Complete Census of Luminous Stellar Variability on Day to Decade Timescales
Dolphin, Andrew E.; van Dokkum, Pieter; Conroy, Charlie +6 more
Stellar photometric variability offers a novel probe of the interior structure and evolutionary state of stars. Here we present a census of stellar variability on day to decade timescales across the color-magnitude diagram (CMD) for 73,000 stars brighter than M I,814 = -5 in the Whirlpool Galaxy (M51). Our Cycle 24 Hubble Space Telescop…
Prospects for Backtracing 1I/‘Oumuamua and Future Interstellar Objects
Zhang, Qicheng
1I/‘Oumuamua is the first of likely many small bodies of extrasolar origin to be found in the solar system. These interstellar objects (ISOs) are hypothesized to have formed in extrasolar planetary systems prior to being ejected into interstellar space and subsequently arriving at the solar system. This paper discusses necessary considerations for…
The H 0 Tension in Non-flat QCDM Cosmology
Huang, Zhiqi; Miao, Haitao
The recent local measurement of the Hubble constant leads to a more than 3σ tension with Planck + ΛCDM. In this article we study the H 0 tension in non-flat QCDM cosmology, where Q stands for a minimally coupled and slowly or moderately rolling quintessence field ϕ with a smooth potential V(φ ), and CDM refers to cold dark matter. By ge…
Evolution of the Stellar Mass-Metallicity Relation. I. Galaxies in the z ∼ 0.4 Cluster Cl0024
Treu, Tommaso; Ellis, Richard S.; Moran, Sean M. +2 more
We present the stellar mass-stellar metallicity relationship (MZR) in the galaxy cluster Cl0024+1654 at z ∼ 0.4 using full-spectrum stellar population synthesis modeling of individual quiescent galaxies. The lower limit of our stellar mass range is M * = 109.7 M ⊙, the lowest galaxy mass at which individual stellar…
The Type I Superluminous Supernova PS16aqv: Lightcurve Complexity and Deep Limits on Radioactive Ejecta in a Fast Event
Berger, E.; Chornock, R.; Fong, W. +6 more
We present UV/optical observations of PS16aqv (SN 2016ard), a fast-evolving Type I superluminous supernova (SLSN-I) that reached a peak absolute magnitude of M r ≈ -22.1. The lightcurves exhibit a significant undulation at 30 rest-frame days after peak, with a behavior similar to undulations seen in the slowly fading SLSN-I SN 2015bn.…
Constraints on Cosmological Parameters from the Angular Power Spectrum of a Combined 2500 deg2 SPT-SZ and Planck Gravitational Lensing Map
Bleem, L. E.; Stark, A. A.; George, E. M. +44 more
We report constraints on cosmological parameters from the angular power spectrum of a cosmic microwave background (CMB) gravitational lensing potential map created using temperature data from 2500 deg2 of South Pole Telescope (SPT) data supplemented with data from Planck in the same sky region, with the statistical power in the combined…
Forecasting the Contribution of Polarized Extragalactic Radio Sources in CMB Observations
Baccigalupi, C.; Bonavera, L.; Danese, L. +7 more
We combine the latest data sets obtained with different surveys to study the frequency dependence of polarized emission coming from extragalactic radio sources (ERS). We consider data over a very wide frequency range starting from 1.4 GHz up to 217 GHz. This range is particularly interesting since it overlaps the frequencies of the current and for…
Boötes III is a Disrupting Dwarf Galaxy Associated with the Styx Stellar Stream
Sand, D. J.; Carlin, Jeffrey L.
We present proper motion (PM) measurements of Boötes III, an enigmatic stellar satellite of the Milky Way (MW), utilizing data from the second data release of the Gaia mission. By selecting 15 radial velocity confirmed members of Boötes III, along with a likely RR Lyrae member in the vicinity, we measure an error-weighted mean PM of (µ …