Search Publications
X-ray microcalorimeters for Astro-E2 and high-energy astrophysics
Kelley, Richard L.
The Japan/US Suzaku (formerly Astro-E2) astrophysics mission has been successfully launched. Suzaku is a powerful new orbiting observatory for studying extremely energetic processes in the universe. Sensitive X-ray spectrometers have been designed to enable precise measurements of high-energy processes in stars, supernova remnants, galaxies, clust…
Scientific highlights from INTEGRAL
Winkler, Christoph
The gamma-ray observatory INTEGRAL was launched in October 2002 and produces since then a wealth of discoveries and important new results. I will present a selection of scientific highlights obtained during the first 2.5 years of the mission.
Multi-wavelength properties of the high-energy bright Seyfert 1 galaxy IGR J18027-1455
Chaty, S.; Combi, J. A.; Martí, J. +1 more
A new sample of hard X-ray sources in the Galactic Plane is being revealed by the regular observations performed by the INTEGRAL satellite. The full characterization of these sources is mandatory to understand the hard X-ray sky. Here we report new multifrequency radio, infrared and optical observations of the source
Helium, Carbon and Silicon Abundances in the HW VIR Eclipsing Binary Subdwarf-B Primary
Lynas-Gray, A. E.; Mortimore, A. N.
Light curve solutions show HW Vir and PG 1336-018 to be remarkably similar eclipsing binaries. The subdwarf-B (sdB) primary of PG 1336-018 is a pulsator but pulsation is not detected in the sdB primary of HW Vir. Ultraviolet spectra were used to obtain carbon and silicon abundances in the sdB primary of HW Vir; in due course these should be compar…
Modeling the Evolution of Dusty Starburst Galaxies in Multiband Deep Surveys
Wang, Y. P.
We model the constraints set on the evolution of dusty starburst galaxies by the current deep extragalactic surveys performed in the far-infrared with Spitzer, and at radio wavelengths with the VLA. Our models fit the number counts in all the available spectral bands well and also provide a reasonably close match to the redshift distribution of th…
Great Storm Particle Event on 2000 August 11 Observed by SOHO ERNE
Riihonen, E.; Torsti, J.; Mäkelä, P. +1 more
We report on an energetic storm particle event on 2000 August 11 observed by ERNE on board SOHO. A large-intensity enhancement started simultaneously in all energy channels between 2 and 50 MeV at 11 UT. The concurrence of the onsets indicates the local nature of the particle event. Intensities increased 100-fold from the background level before 1…
Probing the ionized ISM of the CSS quasar 3C 277.1. I. Observations
Fanti, R.; Cotton, W. D.; Fanti, C. +2 more
We present new multi-wavelength high resolution VLA polarimetric images of the CSS quasar 3C 277.1 and analyze them with older Merlin and HST [OIII] images. These observations were made to test the hypothesis that the [OIII] emission as well as the long wavelength radio opacity arise in shocks that the quasar jet induces in the ISM. The multi-wave…
Multiwavelength Analyses of Faint Infrared Galaxies
Berta, Stefano
The present work follows a chronological outline covering the development of infrared space facilities in recent decades. The Infrared Astronomical Satellite (launched in 1984), Infrared Space Observatory (1995), and Spitzer Space Telescope (2003 August) constitute a logical sequence in the study of galactic infrared properties, with a well-modula…
Contribution to the study of binaries with spectral types F, G, K, and M XI. Orbital elements of three red-giant spectroscopic binaries: HR 1304, HR 1908, and HD 126947
Griffin, R. F.; Prieur, J. -L.; Carquillat, J. -M.
The orbital elements of three red-giant single-lined spectroscopic binaries, HR 1304, HR 1908 and HD 126947, are presented. They are obtained from observations made with two photoelectric spectrometers of CORAVEL type, the first located at the Observatoire de Haute-Provence and the second at the Cambridge Observatories. HR 1304 and HR 1908 are kno…
First ground-based photometry and light-curve analysis of the eccentric eclipsing binary V744 Cas
Bulut, İ.; Erdem, A.; Bakis, V. +3 more
The first ground-based BVR photometric observations of the recently discovered eclipsing binary V744 Cas are presented. From these measurements, timings for two primary and one secondary minima have been calculated. The light curves of the system were analyzed by using the Wilson-Devinney program. The analysis shows that the system is detached wit…