Search Publications
Proton and alpha particle precipitation onto the upper atmosphere of Venus
Fedorov, A.; Barabash, S.; Futaana, Y. +5 more
We study the precipitation of protons and alpha-particles onto the upper atmosphere of Venus, using particle data recorded by the Venus Express spacecraft inside the induced magnetosphere. Our investigations are limited to the dayside close to the terminator. We observe on average a net downward flux of protons, which originate partly from the pla…
Particle-in-cell modeling of Dual Segmented Langmuir Probe on PROBA2
Imtiaz, Nadia; Marchand, Richard
We model the current characteristics of the Dual Segmented Langmuir Probe (DSLP), which is a part of the scientific payload of the ESA satellite PROBA2. It is used for the directional measurement of plasma parameters in the ionosphere at an altitude of approximately 725 km. The DSLP consists of two independent segmented Langmuir probes. Each probe…
Study of COROT 310266512: A Light Curve with Primary, Secondary, and Tertiary Eclipses
Chou, Dean-Yi; Fernández Fernández, Javier
Application of Vector Spherical Harmonics and Kernel Regression to the Computations of OMM Parameters
Marco, F. J.; Martínez, M. J.; López, J. A.
The high quality of Hipparcos data in position, proper motion, and parallax has allowed for studies about stellar kinematics with the aim of achieving a better physical understanding of our galaxy, based on accurate calculus of the Ogorodnikov-Milne model (OMM) parameters. The use of discrete least squares is the most common adjustment method, but…
Source Identification in the IGR J17448-3232 Field: Discovery of the Scorpius Galaxy Cluster
Wik, Daniel R.; Tomsick, John A.; Chaty, Sylvain +2 more
We use a 43 ks XMM-Newton observation to investigate the nature of sources first distinguished by a follow-up Chandra observation of the field surrounding INTEGRAL source IGR J17448-3232, which includes extended emission and a bright point source previously classified as a blazar. We establish that the extended emission is a heretofore unknown mas…
Mid-IR Enhanced Galaxies in the Coma & Virgo Clusters: Lenticulars with a High Star Formation Rate
Riguccini, L.; Amblard, A.; Temi, P. +2 more
We explore the properties of early-type galaxies (ETGs), including ellipticals (E) and lenticulars (S0), in rich environments, such as clusters of galaxies (Virgo and Coma). The L24/LK distribution of ETGs in both Virgo and Coma clusters shows that some S0s have a much larger L24/LK ratio (0.5 to ∼2 dex)…
Resolving the Merging Planck Cluster PLCK G147.3-16.6 with GISMO
van Weeren, R. J.; Bulbul, E.; Kovács, A. +6 more
The Planck satellite has recently completed an all-sky galaxy cluster survey exploiting the thermal Sunyaev-Zel’dovich (SZ) effect to locate some of the most massive systems observable. With a median redshift of < z> =0.22, the clusters found by Planck at z\gt 0.3 are proving to be exceptionally massive and/or disturbed systems. One notable …
Attenuation of Coronal Magnetic Fields in Solar Microwave Bursts
Tan, Baolin; Wu, Zhao; Huang, Guangli +3 more
Based on the observed data by the Nobeyama Radio Observatory and the nonthermal gyrosynchrotron theory, the calculated magnetic field in a loop-like radio source of the 2001 October 23 flare attenuates from hundreds to tens of Gauss, except in the region with very weak magnetic fields. Meanwhile, the viewing angle between the magnetic field and li…
Magnetospheric signatures of ionospheric density cavities observed by Cluster
Karlsson, T.; Wright, A. N.; Russell, A. J. B.
We present Cluster measurements of large amplitude electric fields correlated with intense downward field-aligned currents, observed during a nightside crossing of the auroral zone. The data are reproduced by a simple model of magnetosphere-ionosphere coupling which, under different conditions, can also produce a divergent electric field signature…
Supernova Remnant Mass Accumulated during the Star Formation History of the z = 3.8 Radio Galaxies 4C41.17 and TN J2007-1316
De Breuck, C.; Drouart, G.; Rocca-Volmerange, B.
In this paper, we show that the supernova remnant (SNR) masses accumulated from core-collapse supernovae (SNe) along the star formation history of two powerful z = 3.8 radio galaxies, 4C41.17 and TN J2007-1316, reach up to ≥slant {{10}9} {{M}⊙ }, which is comparable to supermassive black hole (SMBH) masses measured from the S…