Search Publications
Mapping the Particle Acceleration in the Cool Core of the Galaxy Cluster RX J1720.1+2638
Brunetti, G.; Giacintucci, S.; Venturi, T. +4 more
We present new deep, high-resolution radio images of the diffuse minihalo in the cool core of the galaxy cluster RX J1720.1+2638. The images have been obtained with the Giant Metrewave Radio Telescope at 317, 617, and 1280 MHz and with the Very Large Array at 1.5, 4.9, and 8.4 GHz, with angular resolutions ranging from 1'' to 10''. This represents…
Spectral and Morphological Analysis of the Remnant of Supernova 1987A with ALMA and ATCA
Baes, Maarten; Matsuura, Mikako; Fransson, Claes +18 more
We present a comprehensive spectral and morphological analysis of the remnant of supernova (SN) 1987A with the Australia Telescope Compact Array (ATCA) and the Atacama Large Millimeter/submillimeter Array (ALMA). The non-thermal and thermal components of the radio emission are investigated in images from 94 to 672 GHz (λ 3.2 mm to 450 µm), w…
Observations of MCG-5-23-16 with Suzaku, XMM-Newton and NuSTAR: Disk Tomography and Compton Hump Reverberation
Harrison, F. A.; Craig, W.; Stern, D. +12 more
MCG-5-23-16 is one of the first active galactic nuclei (AGNs) where relativistic reverberation in the iron K line originating in the vicinity of the supermassive black hole was found, based on a short XMM-Newton observation. In this work, we present the results from long X-ray observations using Suzaku, XMM-Newton, and NuSTAR designed to map the e…
Nonlinear and Linear Timescales near Kinetic Scales in Solar Wind Turbulence
Matthaeus, W. H.; Chapman, S. C.; Karimabadi, H. +8 more
The application of linear kinetic treatments to plasma waves, damping, and instability requires favorable inequalities between the associated linear timescales and timescales for nonlinear (e.g., turbulence) evolution. In the solar wind these two types of timescales may be directly compared using standard Kolmogorov-style analysis and observationa…
Probing the Crust of the Neutron Star in EXO 0748-676
Degenaar, N.; Wijnands, R.; Wolff, M. T. +7 more
X-ray observations of quiescent X-ray binaries have the potential to provide insight into the structure and the composition of neutron stars. EXO 0748-676 had been actively accreting for over 24 yr before its outburst ceased in late 2008. Subsequent X-ray monitoring revealed a gradual decay of the quiescent thermal emission that can be attributed …
Three Gravitationally Lensed Supernovae behind CLASH Galaxy Clusters
Donahue, Megan; Broadhurst, Tom; Filippenko, Alexei V. +42 more
We report observations of three gravitationally lensed supernovae (SNe) in the Cluster Lensing And Supernova survey with Hubble (CLASH) Multi-Cycle Treasury program. These objects, SN CLO12Car (z = 1.28), SN CLN12Did (z = 0.85), and SN CLA11Tib (z = 1.14), are located behind three different clusters, MACSJ1720.2+3536 (z = 0.391), RXJ1532.9+3021 (z…
Atmospheric Characterization of Five Hot Jupiters with the Wide Field Camera 3 on the Hubble Space Telescope
Deming, Drake; Madhusudhan, Nikku; Ranjan, Sukrit +4 more
We probe the structure and composition of the atmospheres of five hot Jupiter exoplanets using the Hubble Space Telescope Wide Field Camera 3 (WFC3) instrument. We use the G141 grism (1.1-1.7 µm) to study TrES-2b, TrES-4b, and CoRoT-1b in transit; TrES-3b in secondary eclipse; and WASP-4b in both. This wavelength region includes a predicted …
Supernova 2010as: The Lowest-velocity Member of a Family of Flat-velocity Type IIb Supernovae
Morrell, Nidia; Nomoto, Ken'ichi; Phillips, Mark M. +23 more
We present extensive optical and near-infrared photometric and spectroscopic observations of the stripped-envelope supernova SN 2010as. Spectroscopic peculiarities such as initially weak helium features and low expansion velocities with a nearly flat evolution place this object in the small family of events previously identified as transitional Ty…
Fast and Furious: Shock Heated Gas as the Origin of Spatially Resolved Hard X-Ray Emission in the Central 5 kpc of the Galaxy Merger NGC 6240
Elvis, Martin; Zezas, Andreas; Risaliti, Guido +7 more
We have obtained a deep, subarcsecond resolution X-ray image of the nuclear region of the luminous galaxy merger NGC 6240 with Chandra, which resolves the X-ray emission from the pair of active nuclei and the diffuse hot gas in great detail. We detect extended hard X-ray emission from kT ~ 6 keV (~70 MK) hot gas over a spatial scale of 5 kpc, indi…
C/O Abundance Ratios, Iron Depletions, and Infrared Dust Features in Galactic Planetary Nebulae
Delgado-Inglada, Gloria; Rodríguez, Mónica
We study the dust present in 56 Galactic planetary nebulae (PNe) through their iron depletion factors, their C/O abundance ratios (in 51 objects), and the dust features that appear in their infrared spectra (for 33 objects). Our sample objects have deep optical spectra of good quality, and most of them also have ultraviolet observations. We use th…