Low-Mass Active Galactic Nuclei with Rapid X-Ray Variability

Kavli Affiliate: Luis Ho | First 5 Authors: Luis Ho, Minjin Kim, , , | Summary: We present a detailed study of the optical spectroscopic properties of 12 active galactic nuclei (AGNs) with candidate low-mass black holes (BHs) selected by Kamizasa et al. through rapid X-ray variability. The high-quality, echellette Magellan spectra reveal broad H$alpha$ […]


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Quantum difference equation for Nakajima varieties

Kavli Affiliate: Andrei Okounkov | First 5 Authors: Andrei Okounkov, Andrey Smirnov, , , | Summary: For an arbitrary Nakajima quiver variety $X$, we construct an analog of the quantum dynamical Weyl group acting in its equivariant K-theory. The correct generalization of the Weyl group here is the fundamental groupoid of a certain periodic locally […]


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Non-Truthful Position Auctions Are More Robust to Misspecification

Kavli Affiliate: Felix Fischer | First 5 Authors: Paul Dütting, Felix Fischer, David C. Parkes, , | Summary: In the standard single-dimensional model of position auctions, bidders agree on the relative values of the positions and each of them submits a single bid that is interpreted in terms of these values. Motivated by current practice […]


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Women in physics in the United States: recruitment and retention

Kavli Affiliate: Edmund Bertschinger | First 5 Authors: Nina Abramzon, Patrice Benson, Edmund Bertschinger, Susan Blessing, Geraldine L. Cochran | Summary: Initiatives to increase the number, persistence, and success of women in physics in the US reach pre-teen girls through senior women. Programs exist at both the local and national levels. In addition, researchers have […]


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The Hydrogen Epoch of Reionization Array Dish II: Characterization of Spectral Structure with Electromagnetic Simulations and its science Implications

Kavli Affiliate: Jacqueline Hewitt | First 5 Authors: Aaron Ewall-Wice, Richard Bradley, David DeBoer, Jacqueline Hewitt, Aaron Parsons | Summary: We use time-domain electromagnetic simulations to determine the spectral characteristics of the Hydrogen Epoch of Reionization Arrays (HERA) antenna. These simulations are part of a multi-faceted campaign to determine the effectiveness of the dish’s design […]


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Prospects of Passive Radio Detection of a Subsurface Ocean on Europa with a Lander

Kavli Affiliate: Dustin M. Schroeder | First 5 Authors: Andrew Romero-Wolf, Dustin M. Schroeder, Paul Ries, Bruce G. Bills, Charles Naudet | Summary: We estimate the sensitivity of a lander-based instrument for the passive radio detection of a subsurface ocean beneath the ice shell of Europa, expected to be between 3~km – 30~km thick, using […]


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Identifying False Alarms in the Kepler Planet Candidate Catalog

Kavli Affiliate: Christopher Burke | First 5 Authors: F. Mullally, Jeffery L. Coughlin, Susan E. Thompson, Jessie Christiansen, Christopher Burke | Summary: We present a new automated method to identify instrumental features masquerading as small, long period planets in the kepler planet candidate catalog. These systematics, mistakenly identified as planet transits, can have a strong […]


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A Baryonic Effect on the Merger Timescale of Galaxy Clusters

Kavli Affiliate: Qingjuan Yu | First 5 Authors: Congyao Zhang, Qingjuan Yu, Youjun Lu, , | Summary: Accurate estimation of the merger timescale of galaxy clusters is important to understand the cluster merger process and further the formation and evolution of the large-scale structure of the universe. In this paper, we explore a baryonic effect […]


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On Determining if Tree-based Networks Contain Fixed Trees

Kavli Affiliate: Keith Thompson | First 5 Authors: Maria Anaya, Olga Anipchenko-Ulaj, Aisha Ashfaq, Joyce Chiu, Mahedi Kaiser | Summary: We address an open question of Francis and Steel about phylogenetic networks and trees. They give a polynomial time algorithm to decide if a phylogenetic network, N, is tree-based and pose the problem: given a […]


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Bayesian Estimates of Astronomical Time Delays between Gravitationally Lensed Stochastic Light Curves

Kavli Affiliate: Kaisey Mandel | First 5 Authors: Hyungsuk Tak, Kaisey Mandel, David A. van Dyk, Vinay L. Kashyap, Xiao-Li Meng | Summary: The gravitational field of a galaxy can act as a lens and deflect the light emitted by a more distant object such as a quasar. Strong gravitational lensing causes multiple images of […]


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