Search Publications
Supernova Remnant Kes 17: An Efficient Cosmic Ray Accelerator inside a Molecular Cloud
Gelfand, Joseph D.; Temim, Tea; Hughes, John P. +3 more
The supernova remnant Kes 17 (SNR G304.6+0.1) is one of a few but growing number of remnants detected across the electromagnetic spectrum. In this paper, we analyze recent radio, X-ray, and γ-ray observations of this object, determining that efficient cosmic ray acceleration is required to explain its broadband non-thermal spectrum. These observat…
Radial profile of the inner heliospheric magnetic field as deduced from Faraday rotation observations
Mancuso, S.; Garzelli, M. V.
Faraday rotation measures (RMs) of the polarized emission from extragalactic radio sources occulted by the coronal plasma were used to infer the radial profile of the inner heliospheric magnetic field near the solar minimum. By inverting LASCO/SOHO polarized brightness (pB) data taken during the observations in May 1997, we retrieved the electron …
A Transmission Spectrum of Titan's North Polar Atmosphere from a Specular Reflection of the Sun
Nicholson, Philip D.; Sotin, Christophe; Barnes, Jason W. +9 more
Cassini/VIMS T85 observations of a solar specular reflection off of Kivu Lacus (87.°4N 241.°1E) provide an empirical transmission spectrum of Titan's atmosphere. Because this observation was acquired from short range (33,000 km), its intensity makes it visible within the 2.0, 2.7, and 2.8 µm atmospheric windows in addition to the 5 µm …
VLT/XSHOOTER and Subaru/MOIRCS spectroscopy of HUDF.YD3: no evidence for Lyman α emission at z = 8.55
Wilkins, Stephen M.; Bunker, Andrew J.; Caruana, Joseph +5 more
We present spectroscopic observations with VLT/XSHOOTER and Subaru/MOIRCS of a relatively bright Y-band drop-out galaxy in the Hubble Ultra Deep Field (HUDF), first selected by Bunker et al., McLure et al. and Bouwens et al. to be a likely z ≈ 8-9 galaxy on the basis of its colours in the Hubble Space Telescope (HST) Advanced Camera for Surveys an…
Herschel Observations of Cataclysmic Variables
Harrison, Thomas E.; Campbell, Ryan K.; Tappert, Claus +2 more
We have used the PACS instrument on the Herschel Space Observatory to observe eight cataclysmic variables at 70 and 160 µm. Of these eight objects, only AM Her was detected. We have combined the Herschel results with ground-based, Spitzer, and WISE observations to construct spectral energy distributions for all of the targets. For the two dw…
Low-frequency Observations of Drifting, Non-thermal Continuum Radio Emission Associated with the Solar Coronal Mass Ejections
Ramesh, R.; Kathiravan, C.; Wang, T. J. +3 more
Low-frequency (80 MHz) imaging and spectral (≈85-20 MHz) observations of moving type IV radio bursts associated with coronal mass ejections (CMEs) from the Sun on three different days are reported. The estimated drift speed of the bursts is in the range ≈150-500 km s-1. We find that all three bursts are most likely due to second harmoni…
α Centauri A in the far infrared. First measurement of the temperature minimum of a star other than the Sun
Olofsson, G.; Krivov, A. V.; Eiroa, C. +15 more
Context. Chromospheres and coronae are common phenomena on solar-type stars. Understanding the energy transfer to these heated atmospheric layers requires direct access to the relevant empirical data. Study of these structures has, by and large, been limited to the Sun thus far.
Aims: The region of the temperature reversal can be directly obs…
Core electron temperature and density in the innermost Saturn's magnetosphere from HF power spectra analysis on Cassini
Schippers, P.; Moncuquet, M.; Meyer-Vernet, N. +1 more
We analyze the large-scale structures of electrons in Saturn's inner magnetosphere equatorial plane, from 2.8 to about 10 Saturnian radii (RS). The electron total density and core temperature are obtained using the quasi-thermal noise spectroscopy method, based on the HF power spectra measurements acquired with the Cassini/Radio and Pla…
The Herschel-PEP survey: evidence for downsizing in the hosts of dusty star-forming systems
Berta, S.; Magnelli, B.; Nordon, R. +27 more
By making use of Herschel PACS Evolutionary Probe observations of the COSMOS and Extended Groth Strip fields, we have estimated the dependence of the clustering properties of FIR-selected sources on their 100 µm fluxes. Our analysis shows a tendency for the clustering strength to decrease with limiting fluxes. By assuming a power-law slope w…
Hubble Space Telescope Imaging of the Binary Nucleus of the Planetary Nebula EGB 6
Bond, Howard E.; Gianninas, A.; Ciardullo, Robin +4 more
EGB 6 is an ancient, low-surface-brightness planetary nebula. The central star, also cataloged as PG 0950+139, is a very hot DAOZ white dwarf (WD) with an apparent M dwarf companion, unresolved from the ground but detected initially through excesses in the JHK bands. Its kinematics indicates membership in the Galactic disk population. Inside of EG…