Search Publications
The Blue Straggler Population in the Globular Cluster M53 (NGC 5024): A Combined HST, LBT, and CFHT Study
Pasian, F.; Fontana, A.; Grazian, A. +24 more
We used a proper combination of high-resolution and wide-field multiwavelength observations collected at three different telescopes (HST, LBT, and CFHT) to probe the blue straggler star (BSS) population in the globular cluster M53. Almost 200 BSSs have been identified over the entire cluster extension. The radial distribution of these stars has be…
Tailward flow of energetic neutral atoms observed at Mars
Kallio, E.; Barabash, S.; Holmström, M. +7 more
The ASPERA-3 experiment on Mars Express provides the first measurements of energetic neutral atoms (ENAs) from Mars. These measurements are used to study the global structure of the interaction of the solar wind with the Martian atmosphere. In this study we describe the tailward ENA flow observed at the nightside of Mars. After characterizing ener…
Understanding the global evolution of Saturn's ring current
Krimigis, S. M.; Mitchell, D. G.; Carbary, J. F. +3 more
An explanation for the morphology and evolution of the ring current in Saturn's magnetosphere is provided. We use global Energetic Neutral Atom (ENA) images of the 20-140 keV proton distribution obtained by the Ion and Neutral Camera (INCA) on board the Cassini spacecraft. A case where the ring current displays an exceptionally clear spiral shape …
Influence of Nonuniform Distribution of Acoustic Wavefield Strength on Time-Distance Helioseismology Measurements
Zhao, Junwei; Kosovichev, Alexander G.; Parchevsky, Konstantin V.
By analyzing numerically simulated solar oscillation data we study the influence of nonuniform distribution of acoustic wave amplitude, acoustic source strength, and perturbations of the sound speed on the shifts of acoustic travel times measured by the time-distance helioseismology method. It is found that for short distances, the contribution to…
On nonstationarity and rippling of the quasiperpendicular zone of the Earth bow shock: Cluster observations
Dudok de Wit, T.; Krasnoselskikh, V. V.; Lobzin, V. V. +1 more
A new method for remote sensing of the quasiperpendicular part of the bow shock surface is presented. The method is based on analysis of high frequency electric field fluctuations corresponding to Langmuir, upshifted, and downshifted oscillations in the electron foreshock. Langmuir waves usually have maximum intensity at the upstream boundary of t…
A probable close brown dwarf companion to GJ 1046 (M 2.5V)
Kürster, M.; Reffert, S.; Endl, M.
Context: Brown dwarf companions to stars at separations of a few AU or less are rare objects, and none have been found so far around early-type M dwarfs (M 0V-M 5V). With GJ 1046 (M 2.5V), a strong candidate for such a system with a separation of 0.42 AU is presented.
Aims: We aim at constraining the mass of the companion in order to decide wh…
A Deep 0.3-10 keV Spectrum of the H2O Maser Galaxy IC 2560
Done, Chris; Tilak, Avanti; Greenhill, Lincoln J. +1 more
We present a new XMM-Newton spectrum of the Seyfert 2 nucleus of IC 2560, which hosts H2O maser emission from an inclined Keplerian accretion disk. The X-ray spectrum shows soft excess due to multitemperature ionized plasma, a hard continuum, and strong emission features, from Mg, Si, S, Ca, Fe, and Ni, mainly due to fluorescence. It is…
Observation of three distinct ion populations at the Kelvin-Helmholtz-unstable magnetopause
Lavraud, B.; Taylor, M. G. G. T.
We report Double Star spacecraft observations of the dusk-flank magnetopause and its boundary layer under predominantly northward interplanetary magnetic field (IMF). Under such conditions the flank low-latitude boundary layers (LLBL) of the magnetosphere are known to broaden. The primary candidate processes associated with the transport of solar …
A method to search for strong galaxy-galaxy lenses in optical imaging surveys
Dell'Antonio, Ian P.; Kubo, Jeffrey M.
We present a semi-automated method to search for strong galaxy-galaxy lenses in optical imaging surveys. Our search technique constrains the shape of strongly lensed galaxies (or arcs) in a multiparameter space, which includes the third-order (octopole) moments of objects. This method is applied to the Deep Lens Survey (DLS), a deep ground-based w…
Study of Lorentz violation in INTEGRAL gamma-ray bursts
Steiner, Frank; Produit, Nicolas; Lamon, Raphael
We search for possible time lags caused by quantum gravitational effects using gamma-ray bursts (GRBs) detected by INTEGRAL. The advantage of this satellite is that we have at our disposal the energy and arrival time of every detected single photon, which enhances the precision of the time resolution. We present a new method for seeking time lags …