Search Publications
Disentangling the ICL with the CHEFs: Abell 2744 as a Case Study
Jiménez-Teja, Y.; Dupke, R.
Measurements of the intracluster light (ICL) are still prone to methodological ambiguities, and there are multiple techniques in the literature to address them, mostly based on the binding energy, the local density distribution, or the surface brightness. A common issue with these methods is the a priori assumption of a number of hypotheses on eit…
MC2: Mapping the Dark Matter Distribution of the "Toothbrush" Cluster RX J0603.3+4214 with Hubble Space Telescope and Subaru Weak Lensing
Bradač, Maruša; Dawson, William A.; Jee, M. James +5 more
The galaxy cluster RX J0603.3+4214 at z = 0.225 is one of the rarest clusters boasting an extremely large (∼2 Mpc) radio relic. Because of the remarkable morphology of the relic, the cluster is nicknamed the “Toothbrush Cluster.” Although the cluster's underlying mass distribution is one of the critical pieces of information needed to reconstruct …
An HST Survey for 100-1000 au Companions around Young Stellar Objects in the Orion Molecular Clouds: Evidence for Environmentally Dependent Multiplicity
Megeath, S. T.; Hartmann, L.; Fischer, W. J. +2 more
We present a near-infrared survey for the visual multiples in the Orion molecular clouds region at separations between 100 and 1000 au. These data were acquired at 1.6 µm with the NICMOS and WFC3 cameras on the Hubble Space Telescope. Additional photometry was obtained for some of the sources at 2.05 µm with NICMOS and in the L‧ band w…
Shock Connectivity in the August 2010 and July 2012 Solar Energetic Particle Events Inferred from Observations and ENLIL Modeling
Luhmann, J. G.; Jian, L. K.; Odstrcil, D. +3 more
During periods of increased solar activity, coronal mass ejections (CMEs) can occur in close succession and proximity to one another. This can lead to the interaction and merger of CME ejecta as they propagate in the heliosphere. The particles accelerated in these shocks can result in complex solar energetic particle (SEP) events, as observing spa…
Chandra Observations of Outflows from PSR J1509-5850
Pavlov, George G.; Kargaltsev, Oleg; Klingler, Noel +3 more
PSR J1509-5850 is a middle-aged pulsar with a period of P ≈ 89 ms and spin-down power of \dot{E}=5.1× {10}35 erg s-1, at a distance of about 3.8 kpc. We report on deep Chandra X-ray Observatory observations of this pulsar and its pulsar wind nebula (PWN). In addition to the previously detected tail extending up to 7‧ southwes…
High-speed Bullet Ejections during the AGB-to-Planetary Nebula Transition: HST Observations of the Carbon Star, V Hydrae
Sahai, R.; Morris, M. R.; Scibelli, S.
The well-studied carbon star, V Hya, showing evidence for high-speed, collimated outflows and dense equatorial structures, is a key object in the study of the poorly understood transition of AGB stars into aspherical planetary nebulae. Using the Space Telescope Imaging Spectrograph instrument on board the Hubble Space Telescope, we have obtained h…
Structure of Prominence Legs: Plasma and Magnetic Field
Schmieder, B.; Labrosse, N.; López Ariste, A. +1 more
We investigate the properties of a “solar tornado” observed on 2014 July 15, and aim to link the behavior of the plasma to the internal magnetic field structure of the associated prominence. We made multi-wavelength observations with high spatial resolution and high cadence using SDO/AIA, the Interface Region Imaging Spectrograph (IRIS) spectrogra…
Axion Decay and Anisotropy of Near-IR Extragalactic Background Light
Gong, Yan; Cooray, Asantha; Mitchell-Wynne, Ketron +3 more
The extragalactic background light (EBL) is composed of the cumulative radiation from all galaxies and active galactic nuclei over cosmic history. In addition to point sources, the EBL also contains information from diffuse sources of radiation. The angular power spectra of the near-infrared intensities could contain additional signals, and a comp…
On the Misalignment between Chromospheric Features and the Magnetic Field on the Sun
Martínez-Sykora, Juan; De Pontieu, Bart; Hansteen, Viggo +1 more
Observations of the upper chromosphere show an enormous amount of intricate fine structure. Much of this comes in the form of linear features, which are most often assumed to be well aligned with the direction of the magnetic field in the low plasma β regime that is thought to dominate the upper chromosphere. We use advanced radiative magnetohydro…
Detection of Three Gamma-ray Burst Host Galaxies at z ∼ 6
Stocke, J. T.; Shull, J. M.; Bremer, M. +17 more
Long-duration gamma-ray bursts (GRBs) allow us to pinpoint and study star-forming galaxies in the early universe, thanks to their orders of magnitude brighter peak luminosities compared to other astrophysical sources, and their association with the deaths of massive stars. We present Hubble Space Telescope Wide Field Camera 3 detections of three S…