Search Publications
Superorbital Modulation in the High-mass X-Ray Binary 4U 1538-52 and Possible Modulation in IGR J16393-4643
Roche, Paul; Pottschmidt, Katja; Corbet, Robin H. D. +2 more
Hard X-ray observations with the Neil Gehrels Swift Observatory Burst Alert Telescope (BAT) reveal superorbital modulation in the wind-accreting supergiant high-mass X-ray binary (HMXB) 4U 1538-52 at a period of 14.9130 ± 0.0026 days that is consistent with four times the 3.73 day orbital period. These periods agree with a previously suggested cor…
Revisiting the Spectral Features of Ellerman Bombs and UV Bursts. I. Radiative Hydrodynamic Simulations
Ding, M. D.; Li, Ying; Hong, Jie +1 more
Ellerman bombs (EBs) and UV bursts are both small-scale solar activities that occur in active regions. They are now believed to form at different heights in the lower atmosphere. In this paper, we use one-dimensional radiative hydrodynamic simulations to calculate various line profiles in response to heating in different atmospheric layers. We con…
Constraints on Optical Emission of FAST-detected FRB 20181130B with GWAC Synchronized Observations
Huang, L.; Wang, J.; Li, H. L. +17 more
Multiwavelength simultaneous observations are essential to the constraints on the origin of fast radio bursts (FRBs). However, it is a significant observational challenge due to the nature of FRBs as transients with a radio millisecond duration, which occur randomly in the sky regardless of time and position. Here, we report the search for short-t…
The Carina Nebula and Gum 31 Molecular Complex. III. The Distribution of the 1-3 GHz Radio Continuum across the Whole Nebula
Garay, Guido; Breen, Shari L.; Rebolledo, David +2 more
We report the most detailed 1-3 GHz radio continuum emission map of the nearest region of massive-star formation, the Carina Nebula. As part of a large program with the Australia Telescope Compact Array, we have covered ∼12 deg2, achieving an angular resolution of ∼16″, representing the largest and most complete map of the radio continu…
Spectroscopic Monitoring of the Candidate Tidal Disruption Event in F01004-2237
Jonker, Peter G.; Cannizzaro, Giacomo; Mata-Sánchez, D.
We present results of spectroscopic monitoring observations of the ultraluminous infrared galaxy F01004-2237. This galaxy was observed to undergo changes in its optical spectrum, detected by comparing a spectrum from 2015 with one from 2000. These changes were coincident with photometric brightening. The main changes detected in the optical spectr…
The Fundamental Plane of Massive Quiescent Galaxies at z ∼ 2
Conselice, Christopher J.; Gallazzi, Anna; Zibetti, Stefano +11 more
We examine the Fundamental Plane (FP) and mass-to-light ratio (M/L) scaling relations using the largest sample of massive quiescent galaxies at 1.5 < z < 2.5 to date. The FP (re, σe, Ie) is established using 19 UVJ quiescent galaxies from COSMOS with Hubble Space Telescope HF160W rest-frame optical…
Low-frequency Waves due to Newborn Interstellar Pickup He+ Observed by the Ulysses Spacecraft
Isenberg, Philip A.; Schwadron, Nathan A.; Murphy, Neil +8 more
We have surveyed magnetic field data from the Ulysses spacecraft and found examples of magnetic waves with the expected characteristics that point to excitation by newborn pickup He+. With interstellar neutrals as the likely source for the pickup ions, we have modeled the ion production rates and used them to produce wave excitation rat…
Stellar, Gas, and Dust Emission of Star-forming Galaxies out to z ∼ 2
Gronwall, Caryl; Ciardullo, Robin; Bowman, William P. +1 more
While dust is a major player in galaxy evolution, its relationship with gas and stellar radiation in the early universe is still not well understood. We combine 3D-Hubble Space Telescope emission-line fluxes with far-UV through far-IR photometry in a sample of 669 emission-line galaxies (ELGs) between 1.2 < z < 1.9 and use the MCSED spectral…
A Deep Census of Outlying Star Formation in the M101 Group
Mihos, J. Christopher; Harding, Paul; Watkins, Aaron E. +1 more
We present deep, narrowband imaging of the nearby spiral galaxy M101 and its group environment to search for star-forming dwarf galaxies and outlying H II regions. Using the Burrell Schmidt telescope, we target the brightest emission lines of star-forming regions, Hα, Hβ, and [O III], to detect potential outlying star-forming regions. Our survey c…
Radiation Belt Response to Fast Reverse Shock at Geosynchronous Orbit
Kanekal, Shrikanth G.; Sibeck, David; Bhaskar, Ankush +5 more
Fast reverse shocks (FRSs) cause the magnetosphere to expand, by contrast to the well-known compressions caused by the impact of fast forward shocks (FFS). Usually, FFSs are more geoeffective than FRSs, and consequently the inner magnetosphere dynamic responses to both shock types can be quite different. In this study, we investigate for the first…