Search Publications
The Roll-over of Heliospheric Neutral Hydrogen below 100 eV: Observations and Implications
Wurz, P.; McComas, D. J.; Fuselier, S. A. +8 more
We present an improved analysis of the energy spectrum of energetic neutral hydrogen from the heliosheath observed with the IBEX-Lo sensor on the Interstellar Boundary EXplorer from the years 2009 to 2012. This analysis allows us to study the lowest energies between 10 and 100 eV although various background sources are more intense than the target…
Leveraging 3D-HST Grism Redshifts to Quantify Photometric Redshift Performance
Weiner, Benjamin J.; van Dokkum, Pieter G.; Franx, Marijn +10 more
We present a study of photometric redshift accuracy in the 3D-HST photometric catalogs, using 3D-HST grism redshifts to quantify and dissect trends in redshift accuracy for galaxies brighter than JH IR > 24 with an unprecedented and representative high-redshift galaxy sample. We find an average scatter of 0.0197 ± 0.0003(1 + z) in th…
Tracing p-mode Waves from the Photosphere to the Corona in Active Regions
Zhao, Junwei; Chen, Ruizhu; Felipe, Tobías +1 more
Atmosphere above sunspots is abundant with different types of waves. Among these waves are running penumbral waves in the chromosphere, quasi-periodic oscillations in the lower coronal loops, and recently reported running waves in sunspots’ photosphere, all of which were interpreted as magnetoacoustic waves by some authors. Are these waves in diff…
Analysis of Coronal Rain Observed by IRIS, HINODE/SOT, and SDO/AIA: Transverse Oscillations, Kinematics, and Thermal Evolution
Kohutova, P.; Verwichte, E.
Coronal rain composed of cool plasma condensations falling from coronal heights along magnetic field lines is a phenomenon occurring mainly in active region coronal loops. Recent high-resolution observations have shown that coronal rain is much more common than previously thought, suggesting its important role in the chromosphere-corona mass cycle…
A Very Compact Dense Galaxy Overdensity with δ ≃ 130 Identified at z ∼ 8: Implications for Early Protocluster and Cluster Core Formation
Ouchi, Masami; Harikane, Yuichi; Ishigaki, Masafumi
We report the first identification of a compact dense galaxy overdensity at z∼ 8 called A2744z8OD. A2744z8OD consists of eight Y-dropout galaxies behind Abell 2744 that were originally pinpointed by Hubble Frontier Fields studies. However, so far, no studies have derived the basic physical quantities of structure formation or made comparisons with…
Disky Elliptical Galaxies and the Allegedly Over-massive Black Hole in the Compact “ES“ Galaxy NGC 1271
Ciambur, Bogdan C.; Graham, Alister W.; Savorgnan, Giulia A. D.
While spiral and lenticular galaxies have large-scale disks extending beyond their bulges, and most local early-type galaxies with 1010 < M */M ⊙ < 2 × 1011 contain a disk (e.g., ATLAS3D), the early-type galaxies do possess a range of disk sizes. The edge-on, intermediate-scale disk in t…
A Soft X-Ray Spectral Episode for the Clocked Burster, GS 1826-24 as Measured by Swift and NuStar
Harrison, F. A.; Stern, D.; Zhang, W. W. +12 more
We report on NuSTAR and Swift observations of a soft state of the neutron star low-mass X-ray binary GS 1826-24, commonly known as the “clocked” burster. The transition to the soft state was recorded in 2014 June through an increase of the 2-20 keV source intensity measured by MAXI, simultaneous with a decrease of the 15-50 keV intensity measured …
Scale-dependent Normalized Amplitude and Weak Spectral Anisotropy of Magnetic Field Fluctuations in the Solar Wind Turbulence
He, Jiansen; Wang, Xin; Wang, Linghua +2 more
Turbulence in the solar wind was recently reported to be anisotropic, with the average power spectral index close to -2 when sampling parallel to the local mean magnetic field B0 and close to -5/3 when sampling perpendicular to the local B0. This result was widely considered to be observational evidence for the critical balan…
A Herschel View of Protoplanetary Disks in the σ Ori Cluster
Calvet, Nuria; Briceño, César; Ali, Babar +6 more
We present new Herschel observations using the Photodetector Array Camera and Spectrometer of 32 T Tauri stars in the young (∼3 Myr) σ Ori cluster. Most of our objects are K and M stars with large excesses at 24 µm. We used irradiated accretion disk models of D’Alessio et al. to compare their spectral energy distributions with our observatio…
Flare-generated Shock Wave Propagation through Solar Coronal Arcade Loops and an Associated Type II Radio Burst
Innes, D. E.; Kumar, Pankaj; Cho, Kyung-Suk
This paper presents multiwavelength observations of a flare-generated type II radio burst. The kinematics of the shock derived from the type II burst closely match a fast extreme ultraviolet (EUV) wave seen propagating through coronal arcade loops. The EUV wave was closely associated with an impulsive M1.0 flare without a related coronal mass ejec…