Search Publications

The reddest ISO-2MASS quasar

Cesarsky, C.; Siebenmorgen, R.; Haas, M. +9 more

Context: While there is growing consensus on the existence of numerous dust-enshrouded red quasars, their discovery and detailed exploration is still an observational challenge. In the course of the near-mid-infrared AGN search combining the 6.7 µm ISOCAM Parallel Survey and 2MASS we have discovered 24 type-1 quasars about a third of which a…

Energization of particles in Saturn's inner magnetosphere: Monte Carlo simulation of stochastic electric field effects

Durand-Manterola, H.; Martínez-Gómez, E.; Pérez, H.

Context: Our knowledge of energetic particles in Saturn's inner magnetosphere is based on observations made during the flybys of Pioneer 11, Voyager 1, Voyager 2, and recently by Cassini. The most important features of the energetic particle population in the inner Saturnian magnetosphere are: 1) the rings and the many large and small satellites i…

An extension of the SHARC survey

Romer, A. K.; Adami, C.; Holden, B. P. +8 more

Aims:We report on our search for distant clusters of galaxies based on optical and X-ray follow up observations of X-ray candidates from the SHARC survey, and based on the assumption that the absence of bright optical or radio counterparts to possibly extended X-ray sources could mean that they are distant clusters.
Methods: We have obtained d…

Mass distribution in the most X-ray-luminous galaxy cluster RX J1347.5-1145 studied with XMM-Newton

Schindler, S.; Gitti, M.; Piffaretti, R.

Searching for absorbed AGN in the 2XMM-Newton pre-release EPIC Serendipitous Source Catalogue

Watson, M. G.; Caccianiga, A.; Severgnini, P. +7 more

Aims:We aim to test a method of efficiently selecting X-ray obscured AGN in the 2XMM-Newton EPIC Serendipitous Source Catalogue.
Methods: By means of a strong correlation established using the XMM-Newton Hard Bright Sample between the intrinsic absorption and the hardness ratio to the 0.5-2.0 keV and 2.0-4.5 keV bands, an efficient way of sele…

Variations of the ultraviolet resonance lines of the B2 IV-V star ζ Cassiopeiae

Smith, M. A.; Bohlender, D. A.

Recently Neiner et al. reported that the B2 IV-V star ζ Cas contains a weak magnetic field which varies on the same 5.37 day period found from the modulations of its N V, C IV, and Si IV UV resonance lines. We have studied the time variable properties of the same resonance lines in greater detail to determine the physical characteristics of the ma…

A near-ultraviolet view of the inner region of M 31 with the large binocular telescope

Pasian, F.; Fontana, A.; Grazian, A. +28 more

Aims:We present a 900 s, wide-field U image of the inner region of the Andromeda galaxy obtained during the commissioning of the blue channel of the Large Binocular Camera mounted on the prime focus of the Large Binocular Telescope.
Methods: Relative photometry and absolute astrometry of individual sources in the image was obtained along with …