Search Publications
CARMA Follow-up of the Northern Unconfirmed Planck Galaxy Cluster Candidates
Carpenter, John; Sievers, Jonathan; Muchovej, Stephen +2 more
We present the Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of the three northern unconfirmed galaxy clusters discovered by the Planck satellite. We confirm the existence of two massive clusters (PLCKESZ G115.71+17.52 and PLCKESZ G121.11+57.01) at high significance. For these clusters, we present refined centroid l…
Inter-hemispheric asymmetry of dependence of the cusp location on dipole tilt during northward IMF conditions
Liu, Z.; Dandouras, I.; Lucek, E. +6 more
A data set of the Cluster cusp crossings over a 5-year period is studied for the interhemispheric comparison of the dipole tilt angle effect on the latitude of the mid-altitude cusp. The result shows that the dipole tilt angle has a clear control of the cusp latitudinal location. Although, the northern cusp moves 0.054° ILAT for every 1° increase …
Diurnal variation of electron density in Saturn’s ionosphere: Model comparisons with Saturn Electrostatic Discharge (SED) observations
Galand, Marina; Moore, Luke; Fischer, Georg +2 more
Using the Saturn Thermosphere Ionosphere Model (STIM), we present a study of the diurnal variation of electron density, with a focus on comparisons with peak electron densities (NMAX) inferred from the low-frequency cutoff of radio emission due to lightning in the lower atmosphere, called Saturn Electrostatic Discharges (SEDs). It is de…
Cassini-UVIS observation of dayglow FUV emissions of carbon in the thermosphere of Venus
Gérard, J. -C.; Hubert, B.; Gladstone, G. R. +3 more
We analyze FUV spatially-resolved dayglow spectra obtained at 0.37 nm resolution by the UVIS instrument during the Cassini flyby of Venus. The intensities of the ultraviolet multiplets of carbon at 126.1, 156.1 and 165.7 nm are determined using a least squares fit technique applied to all dayglow spectra recorded by UVIS along the Cassini track. T…
Study of an Extended EUV Filament Using SoHO/SUMER Observations of the Hydrogen Lyman Lines. II. Lyman α Line Observed During a Multi-wavelength Campaign
Heinzel, P.; Schmieder, B.; Schwartz, P. +1 more
A filament and its channel close to the solar disk were observed in the complete hydrogen Lyman spectrum, and in several EUV lines by the SUMER (Solar Ultraviolet Measurement of Emitted Radiation) and CDS (Coronal Diagnostic Spectrometer) spectrographs on the SoHO satellite, and in Hα by ground-based telescopes during a multi-instrument campaign i…
The magnetar candidate AX J1818.8-1559
Tiengo, A.; Götz, D.; Mereghetti, S. +3 more
In October 2007, a hard X-ray burst was detected by the INTEGRAL satellite from a direction consistent with the position of AX J1818.8-1559, an X-ray source at low Galactic latitude discovered with the Advanced Satellite for Cosmology and Astrophysics (ASCA) satellite in 1996-1999. The short duration (0.8 s) and soft spectrum (power-law photon ind…
The nature of the multi-wavelength emission of 3C 111
Beckmann, V.; Mattana, F.; de Jong, S.
Aims: We attempt to determine the nature of the high energy emission of the radio galaxy 3C 111, by distinguishing between the effects of the thermal and non-thermal processes.
Methods: We study the X-ray spectrum of 3C 111 between 0.4 keV and 200 keV, and its spectral energy distribution, using data from the Suzaku satellite combined wi…
A Chandra Observation of the Ultraluminous Infrared Galaxy IRAS 19254-7245 (the Superantennae): X-Ray Emission from the Compton-thick Active Galactic Nucleus and the Diffuse Starburst
Heckman, Timothy M.; Reeves, James; Braito, Valentina +2 more
We present a Chandra observation of IRAS 19254-7245, a nearby ultraluminous infrared galaxy also known as the Superantennae. The high spatial resolution of Chandra allows us to disentangle for the first time the diffuse starburst (SB) emission from the embedded Compton-thick active galactic nucleus (AGN) in the southern nucleus. No AGN activity is…
Multi-spacecraft Study of the 8 November 2000 SEP Event: Electron Injection Histories 100° Apart
Lario, D.; Vainio, R.; Kilpua, E. +3 more
We present the analysis of a large solar near-relativistic electron event observed by the Ulysses and the ACE spacecraft on 8 November 2000, when Ulysses was located at a heliocentric distance of 2.4 AU and at a heliographic latitude of ∼80° S. We use a particle propagation model to infer the local interplanetary transport conditions and the injec…
The role of photospheric shearing motions in a filament eruption related to the 2010 April 3 coronal mass ejection
Poedts, S.; Romano, P.; Zuccarello, F. P. +1 more
Context. Coronal mass ejections (CMEs) are huge expulsion of solar plasma and magnetic field in the interplanetary medium. Understanding the physics that lies beyond the CME initiation is one of the most fascinating research questions. Several models have been proposed to explain the initiation of CMEs. However, which model better explains the dif…