Search Publications
Possible Periodic Dips in the Pulsating Ultraluminous X-Ray Source M51 ULX-7
Enoto, Teruaki; Ueda, Yoshihiro; Hu, Chin-Ping
We report the discovery of possible periodic X-ray dips in a pulsating ultraluminous X-ray source, M51 ULX-7, with archival Chandra observations. With ∼20 days of monitoring in the superorbital descending state, we discovered three dips with separations of ∼2 and ∼8 days via the Bayesian block technique. A phase-dispersion minimization and a ${\ch…
The H I Column Density Distribution of the Galactic Disk and Halo
Richter, Philipp; Heckman, Timothy; Savage, Blair D. +8 more
We present a census of neutral gas in the Milky Way disk and halo down to limiting column densities of N(H I) ~ 1014 cm-2 using measurements of H I Lyman series absorption from the Far Ultraviolet Spectroscopic Explorer. Our results are drawn from an analysis of 25 AGN sight lines spread evenly across the sky with Galactic la…
ALMA Observations of Lyα Blob 1: Multiple Major Mergers and Widely Distributed Interstellar Media
Ivison, R. J.; Smail, Ian; Hayes, Matthew +11 more
We present observations of a giant Lyα blob (LAB) in the SSA22 protocluster at z = 3.1, SSA22-LAB1, taken with the Atacama Large Millimeter/submillimeter Array. Dust continuum, along with [C II] 158 µm and CO(4-3) line emission have been detected in LAB1, showing complex morphology and kinematics across a ~100 kpc central region. Seven galax…
The VLA Frontier Fields Survey: Deep, High-resolution Radio Imaging of the MACS Lensing Clusters at 3 and 6 GHz
Smail, I.; Dickinson, M.; Jiménez-Andrade, E. F. +9 more
The Frontier Fields project is an observational campaign targeting six galaxy clusters, with the intention of using the magnification provided by gravitational lensing to study galaxies that are extremely faint or distant. We used the Karl G. Jansky Very Large Array (VLA) at 3 and 6 GHz to observe three Frontier Fields: MACS J0416.1-2403 (z = 0.39…
Testing for Dark Matter in the Outskirts of Globular Clusters
Grillmair, Carl J.; Carlberg, Raymond G.
The proper motions of stars in the outskirts of globular clusters are used to estimate cluster velocity dispersion profiles as far as possible within their tidal radii. We use individual color-magnitude diagrams to select high-probability cluster stars for 25 metal-poor globular clusters within 20 kpc of the Sun, 19 of which have substantial numbe…
An In Situ Study of Turbulence near Stellar Bow Shocks
Chatterjee, Shami; Dolch, Timothy; Cordes, James M. +1 more
Stellar bow shocks are observed in a variety of interstellar environments and shaped by the conditions of gas in the interstellar medium (ISM). In situ measurements of turbulent density fluctuations near stellar bow shocks are only achievable with a few observational probes, including Hα-emitting bow shocks and the Voyager Interstellar Mission (VI…
Spatial and Kinematic Clustering of Stars in the Galactic Disk
Conroy, Charlie; Ting, Yuan-Sen; El-Badry, Kareem +1 more
The Galactic disk is expected to be spatially and kinematically clustered on many scales due to both star formation and the Galactic potential. In this work we calculate the spatial and kinematic two-point correlation functions (TPCF) using a sample of 1.7 × 106 stars with radial velocities from Gaia DR2. Clustering is detected on spati…
Magnetofrictional Modeling of an Erupting Pseudostreamer
Reeves, Katharine K.; DeLuca, Edward E.; Savcheva, Antonia +4 more
In this study, we present the magnetic configuration of an erupting pseudostreamer observed on 2015 April 19, on the southwest limb of the Sun, with a prominence cavity embedded inside. The eruption resulted in a partial halo coronal mass ejection. The prominence eruption begins with a slow rise and then evolves to a fast-rise phase. We analyze th…
An Insight into the Coupling of CME Kinematics in Inner and Outer Corona and the Imprint of Source Regions
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +1 more
Despite studying coronal mass ejections (CMEs) for several years, we do not yet have a complete understanding of their kinematics. To this end, it is essential to understand the change in kinematics of the CMEs as they travel from the inner corona (<3 R⊙) up to the higher heights of the outer corona. We conduct a follow-up statistica…
Eclipsing Binaries Found by the EREBOS Project: Gaia DR2 6097540197980557440-a Deeply Eclipsing sdB+dM System
Barlow, Brad N.; Corcoran, Kyle A.; Schaffenroth, Veronika +3 more
We present time-series spectroscopy and photometry of Gaia DR2 6097540197980557440, a new deeply eclipsing hot subdwarf B (sdB) + M dwarf (dM) binary. We discovered this object during the course of the Eclipsing Reflection Effect Binaries from Optical Surveys (EREBOS) project, which aims to find new eclipsing sdB+dM binaries (HW Vir systems) and i…