Search Publications
Near-Earth substorm features from multiple satellite observations
Zhang, T. L.; RèMe, H.; Fazakerley, A. N. +12 more
We investigate a substorm on 3 October 2004 during which 11 satellites were located in near-Earth magnetotail (XGSM > -10 RE). Double Star 1 (TC-1), Cluster, and LANL-97 satellites were closely aligned in the dawn-dusk direction (<1 RE apart) for this conjunction. After substorm expansion onset, TC-1 observed…
Estimation of Spicule Magnetic Field Using Observed MHD Waves by the Hinode SOT
Moon, Yong-Jae; Suematsu, Yoshinori; Cho, Kyung-Suk +3 more
Contribution to Unresolved Infrared Fluctuations from Dwarf Galaxies at Redshifts of 2-3
Chary, Ranga-Ram; Cooray, Asantha; Sullivan, Ian
In order to understand the origin of clustered anisotropies detected in Spitzer images between 3.6 and 8 µm, we stack the Spitzer IRAC/Great Observatories Origins Deep Survey (GOODS) images at pixel locations corresponding to faint, zAB ~ 27 mag, optical sources with no obvious IR counterparts. We obtain a strong detection of the …
Suppression of convection around small magnetic concentrations
Ichimoto, K.; Katsukawa, Y.; Shimojo, M. +3 more
Aims: It is well known that convective motions in the photosphere are suppressed by magnetic fields. However, it has been difficult to study the interaction between convection and small magnetic features, such as G-band bright points (GBPs) or pores with polarimetric measurements, because of the available spatial resolution (~1´´). This situation …
Detectable signatures of cosmic radiative feedback
Salvaterra, R.; Burigana, C.; Schneider, R. +3 more
We use a semi-analytical model to study the impact of reionization, and the associated radiative feedback, on galaxy formation. Two feedback models have been considered: (i) a standard prescription, according to which star formation is totally suppressed in galaxies with circular velocity below a critical threshold (model CF06) and (ii) a characte…
Time Distance Analysis of the Emerging Active Region NOAA 10790
Thompson, M. J.; Zharkov, S.
We investigate the emergence of Active Region NOAA 10790 by means of time - distance helioseismology. Shallow regions of increased sound speed at the location of increased magnetic activity are observed, with regions becoming deeper at the locations of sunspot pores. We also see a long-lasting region of decreased sound speed located underneath the…
EG And: Far Ultraviolet Spectroscopic Explorer and Hubble Space Telescope STIS Monitoring of an Eclipsing Symbiotic Binary
Espey, Brian R.; McCandliss, Stephan R.; Crowley, Cian
We present highlights and an overview of 20 FUSE and HST STIS observations of the bright symbiotic binary EG And. The main motivation behind this work is to obtain spatially resolved information on an evolved giant star in order to understand the mass-loss processes at work in these objects. The system consists of a low-luminosity white dwarf and …
A non-hydrostatic Rhea
Mackenzie, R. A.; Iess, L.; Tortora, P. +1 more
Radiometric data obtained during Cassini's close flyby of Rhea, on 26 November 2005, has been subject to several published analyses aiming to determine the satellite's mass and quadrupole gravity moments. Combining aspects of two of these analyses we present our best, unbiased estimates of the gravity field parameters and point out how the constra…
A phenomenological model of galaxy clusters
Diego, J. M.; Ascasibar, Y.
We present a simple model to describe the dark matter density, the gas density and the gas temperature profiles of galaxy clusters. Analytical expressions for these quantities are given in terms of only five free parameters with a clear physical meaning: the mass M of the dark matter halo (or the characteristic temperature T0), the char…
Optical spectroscopy of Arp220: the star formation history of the closest ULIRG
Tadhunter, C. N.; González Delgado, R. M.; Rodríguez Zaurín, J.
We present long-slit, optical spectra of the merging system Arp220, obtained using the William Herschel Telescope (WHT) on La Palma. These data were taken as a part of a large study of ultraluminous infrared galaxies (ULIRGs) with the aim of investigating the evolution and star formation histories of such objects. Spectral synthesis modelling has …