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Unveiling the Nature of INTEGRAL Sources Through Optical Spectroscopy
Masetti, Nicola
Since its launch on October 2002 the INTEGRAL satellite is performing an deep survey of the hard X-ray sky with unprecedented sensitivity and positional accuracy. This allowed pinpointing, through positional cross-correlation with catalogs at longer wavelengths, possible optical/near-infrared candidates for the hard X-ray sources of still unknown …
The evolution of QSO host colours
Schramm, Malte; Wisotzki, Lutz; Jahnke, Knud +1 more
We summarise the evidence that the hosts of luminous QSOs are systematically bluer than normal (inactive) galaxies of comparable morphological type. We particularly emphasize the importance of performing such studies in a comparative way, placing QSO hosts in a context of the overall galaxy population.
Search for cyclotron lines in INTEGRAL/SPI spectra of Vela X-1
von Kienlin, A.; Schanne, S.; Kretschmar, P. +5 more
The wind-accreting X-ray binary pulsar Vela X-1 has been observed during the two INTEGRAL Core Program observations of the Vela region in June July and November December 2003. Preliminary results on time averaged and time resolved spectra of INTEGRAL/SPI for the two observation epochs are presented. Time averages have been used in order to increas…
Corrigendum: Titan Radar Mapper observations from Cassini's T3 fly-by
Stiles, B.; Kelleher, K.; Callahan, P. +32 more
Stochastic Acceleration of Energetic Particles in the Magnetosphere of Saturn
Martínez-Gómez, E.; Durand-Manterola, H. J.; Tejada, H. Pérez de
Voyager's plasma probe observations suggest that there are at least three fundamentally different plasma regimes in Saturn: the hot outer magnetosphere, the extended plasma sheet, and the inner plasma torus. At the outer regions of the inner torus some ions have been accelerated to reach energies of the order of 43 keV. We develop a model that cal…
The Characteristics of the Cool Component of the Cataclysmic Variable AE Aquarii from Hipparcos Observations
Friedjung, M.
The parallax of the cataclysmic binary AE Aquarii, found using the Hipparcos satellite, is combined with published infrared observations. Indications are obtained that the cool component is somewhat above the main sequence. However, this result is not absolute because of the errors and uncertainties.
Measuring the Mass of 4U 0900-40 Dynamically
Boyd, Patricia T.; Dolan, J. F.; Etzel, Paul B.
Accurate measurements of neutron star masses are needed to constrain the equation of state of neutron star matter-of importance to both particle physics and the astrophysics of neutron stars-and to identify the evolutionary track of the progenitor stars that form neutron stars. The best measured values of the mass of 4U 0900-40 (=Vela XR-1), 1.86+…
The Japanese X-ray missions
Fujita, Y.
Here, I briefly introduce Japanese X-ray missions: Suzaku and NeXT. Suzaku was launched on July 10, 2005. NeXT will be launched in 2011. They will open new windows into the workings of black holes, clusters of galaxies, active galaxies, and other very energetic objects.
Suzaku observation of X-ray afterglow: Spectral and temporal behaviors
Yonetoku, D.; Yamauchi, M.; Yamaoka, K. +34 more
Geoeffective Coronal Mass Ejections and Energetic Particles
Valtonen, Eino
Coronal mass ejections (CMEs) can be geoeffective and they are believed to cause major non-recurrent geomagnetic storms. Energetic particles are closely related to the shocks driven by coronal mass ejections in the interplanetary medium. In this paper, the geoeffectiveness of CMEs is reviewed and the means how energetic particle observations can b…