Search Publications
Ion cyclotron harmonics in the Saturn downward current auroral region
Schippers, P.; Gurnett, D. A.; Coates, A. J. +3 more
Observations of intense upgoing electron beams and diffuse ion beams have been reported during a pass by Cassini in a downward current auroral region, nearby a source region of Saturn kilometric radiation. Using the Cassini Radio and Plasma Wave Science (RPWS) instrument low frequency waveform receiver and the Cassini Plasma Spectrometer Investiga…
The properties of asteroid (2867) Steins from Spitzer Space Telescope observations and OSIRIS shape reconstruction
Jorda, L.; Lamy, P.; Fornasier, S. +1 more
Aims: We report on the thermal properties and composition of asteroid (2867) Steins derived from an analysis of new Spitzer Space Telescope (SST) observations performed in March 2008, in addition to previously published SST observations performed in November 2005.
Methods: We consider the three-dimensional shape model and photometric pro…
Modeling of Jupiter's auroral curtain and upper atmospheric thermal structure
Clarke, J. T.; Cohen, I. J.
A three-dimensional simulation that takes into account the altitude extent of auroral emission along the line of sight has been applied to the analysis of auroral images of Jupiter taken by the Hubble Space Telescope (HST). The simulation's input auroral emission profile with altitude was expanded by an emission scale height factor ranging from n …
High-resolution Observations of Siphon Flows in a Solar Magnetic Pore
Guglielmino, Salvo L.; Zuccarello, Francesca
We investigate signatures of siphon flows in a region around a solar magnetic pore, observed in the photosphere at µ = 0.6, during its decay phase. We analyze high-resolution Stokes spectra acquired by Hinode/Solar Optical Telescope along the Fe I pair at 630.2 nm. We determine the vector magnetic field and the line-of-sight velocity by an i…
Ten Years of Monitoring 3C 273 with XMM–Newton
Zhang, Youhong; Liu, Liu
We present ten years optical/UV/X-ray observations of 3C 273 performed using XMM–Newton between 2000 and 2009. The short-time scale variability behaviour of the soft and hard X-ray light curves may suggest different origins of the soft/hard X-ray emissions. We fit well the 0.2–10 keV X-ray spectrum with a hard power-law component plus a soft Compt…
The Dynamical Distance, RR Lyrae Absolute Magnitude, and Age of the Globular Cluster NGC 6266
McNamara, Bernard J.; McKeever, Jean
The internal proper motion dispersion of NGC 6266 was measured using Hubble Space Telescope Wide Field Planetary Camera 2 images with an epoch difference of eight years. The dispersion was found to be 0.041 ± 0.001 arcsec century -1. This value was then equated to the cluster's radial velocity dispersion of 13.7 ± 1.1 km s-1 …
Integral field spectroscopy of local LCBGs: NGC 7673, a case study. Physical properties of star-forming regions
Sánchez, S. F.; Pérez-Gallego, J.; Guzmán, R. +4 more
Physical properties of the star-forming regions in the local Luminous Compact Blue Galaxy (LCBG) NGC 7673 are studied in detail using 3D spectroscopic data taken with the PMAS fibre pack (PPAK) integral field unit at the 3.5-m telescope in the Centro Astronómico Hispano Alemán (CAHA). We derive integrated and spatially resolved properties such as …
Crossing Filaments
Srivastava, A. K.; Filippov, Boris
Solar filaments show the position of large-scale polarity-inversion lines and are used for the reconstruction of large-scale solar magnetic field structure on the basis of Hα synoptic charts for the periods that magnetographic measurements are not available. Sometimes crossing filaments are seen in Hα filtergrams. We analyze daily Hα filtergrams f…
The response of the polar cusp to a high-speed solar wind stream studied by a multispacecraft wavelet analysis
Zong, Q. -G.; Mouikis, C. G.; Korth, A. +3 more
We investigate the coupling between the solar wind and the magnetospheric cusp during the passage of a Corotating Interaction Region (CIR) high-speed stream. A CIR event on 11 January 2002 is selected for this study. We use ACE (Advanced Composition Explorer) and Geotail plasma and magnetic field data for interplanetary solar wind observations and…
Detection of X-ray galaxy clusters based on the Kolmogorov method
Durret, F.; Gurzadyan, V. G.; Kashin, A. L. +3 more
The detection of clusters of galaxies in large surveys plays an important part in extragalactic astronomy, and particularly in cosmology, since cluster counts can give strong constraints on cosmological parameters. X-ray imaging is, in particular, a reliable means to discover new clusters, and large X-ray surveys are now available. Considering XMM…