Search Publications
Missions
Journals
Publication Years
The Connection between Internetwork Magnetic Elements and Supergranular Flows
Bellot Rubio, L. R.; Katsukawa, Y.; Orozco Suárez, D.
The advection of internetwork magnetic elements by supergranular convective flows is investigated using high spatial resolution, high cadence, and high signal-to-noise ratio Na I D1 magnetograms obtained with the Hinode satellite. The observations show that magnetic elements appear everywhere across the quiet Sun surface. We calculate the proper m…
EUV SpectroPhotometer (ESP) in Extreme Ultraviolet Variability Experiment (EVE): Algorithms and Calibrations
Didkovsky, L.; Jones, A.; Judge, D. +2 more
The Extreme ultraviolet SpectroPhotometer (ESP) is one of five channels of the Extreme ultraviolet Variability Experiment (EVE) onboard the NASA Solar Dynamics Observatory (SDO). The ESP channel design is based on a highly stable diffraction transmission grating and is an advanced version of the Solar Extreme ultraviolet Monitor (SEM), which has b…
Narrow Dust Jets in a Diffuse Gas Coma: A Natural Product of Small Active Regions on Comets
Combi, M. R.; Fougere, N.; Gombosi, T. I. +2 more
Comets often display narrow dust jets but more diffuse gas comae when their eccentric orbits bring them into the inner solar system and sunlight sublimates the ice on the nucleus. Comets are also understood to have one or more active areas covering only a fraction of the total surface active with sublimating volatile ices. Calculations of the gas …
X-Ray Observations of the New Unusual Magnetar Swift J1834.9-0846
Pavlov, George G.; Kargaltsev, Oleg; Griffith, Roger L. +6 more
We present X-ray observations of the new transient magnetar Swift J1834.9-0846, discovered with the Swift Burst Alert Telescope on 2011 August 7. The data were obtained with Swift, Rossi X-ray Timing Explorer (RXTE), CXO, and XMM-Newton both before and after the outburst. Timing analysis reveals single peak pulsations with a period of 2.4823 s and…
Transiting exoplanets from the CoRoT space mission. XX. CoRoT-20b: A very high density, high eccentricity transiting giant planet
Mazeh, T.; Aigrain, S.; Alonso, R. +43 more
We report the discovery by the CoRoT space mission of a new giant planet, CoRoT-20b. The planet has a mass of 4.24 ± 0.23 MJup and a radius of 0.84 ± 0.04 RJup. With a mean density of 8.87 ± 1.10 g cm-3, it is among the most compact planets known so far. Evolutionary models for the planet suggest a mass of heavy el…
An XMM-Newton spatially-resolved study of metal abundance evolution in distant galaxy clusters
Molendi, S.; Gastaldello, F.; Tozzi, P. +3 more
Context. We present an XMM-Newton analysis of the X-ray spectra of 39 clusters of galaxies at 0.4 < z < 1.4, covering a temperature range of 1.5 ≲ kT ≲ 11 keV.
Aims: The main goal of this paper is to study how the abundance evolves with redshift not only by means of a single emission measurement performed on the whole cluster but also b…
Discovery of the millisecond pulsar PSR J2043+1711 in a Fermi source with the Nançay Radio Telescope
Camilo, F.; Guillemot, L.; Harding, A. K. +18 more
We report the discovery of the millisecond pulsar PSR J2043+1711 in a search of a Fermi Large Area Telescope (LAT) source with no known associations, with the Nançay Radio Telescope. The new pulsar, confirmed with the Green Bank Telescope, has a spin period of 2.38 ms, is relatively nearby (? kpc) and is in a 1.48-d orbit around a low-mass compani…
Stars, dust, and the growth of ultraviolet-selected sub-L* galaxies at redshift z∼ 2
Sawicki, Marcin
This work concerns the physical properties of very faint (?= 28 AB mag; Mstars,lim∼ 108 M⊙), ultraviolet-selected (UV-selected) sub-L* BX galaxies at z∼ 2.3. Stellar masses, dust content and dust-corrected star formation rates are constrained using broad-band spectral energy distribution fitting, resulting in a num…
Testing cosmology with extreme galaxy clusters
Harrison, Ian; Coles, Peter
Motivated by recent suggestions that a number of observed galaxy clusters have masses which are too high for their given redshift to occur naturally in a standard model cosmology, we use extreme value statistics to construct confidence regions in the mass-redshift plane for the most extreme objects expected in the universe. We show how such a diag…
Cassini observations of ion and electron beams at Saturn and their relationship to infrared auroral arcs
Coates, A. J.; Brown, R. H.; Baines, K. H. +14 more
We present Cassini Visual and Infrared Mapping Spectrometer observations of infrared auroral emissions from the noon sector of Saturn's ionosphere revealing multiple intense auroral arcs separated by dark regions poleward of the main oval. The arcs are interpreted as the ionospheric signatures of bursts of reconnection occurring at the dayside mag…