Search Publications
Fe XIX observations of active region brightenings in the corona
Solanki, S. K.; Innes, D. E.; Wang, T. J.
Small flarelike brightenings seen in the hot flare line, Fe XIX, by the spectrometer SUMER on SOHO are analysed. We observe active region coronae about 30 Mm off the limb of the Sun for a period of several days. Brightenings are observed with a frequency 3-14 per hour and their lifetimes range from 5-150 min, with an average of about 25 min. The m…
Automatic classification of eclipsing binaries light curves using neural networks
Sarro, L. M.; Sánchez-Fernández, C.; Giménez, Á.
In this work we present a system for the automatic classification of the light curves of eclipsing binaries. This system is based on a classification scheme that aims to separate eclipsing binary systems according to their geometrical configuration in a modified version of the traditional classification scheme. The classification is performed by a…
An X-ray bright ERO hosting a type 2 QSO
Page, M. J.; Akiyama, M.; Carrera, F. J. +8 more
We present the XMM-Newton and the optical-VLT spectra along with the optical and the near-infrared photometric data of one of the brightest X-ray (F2{-10 keV}∼10-13 erg s-1 cm-2) extremely red objects (R-K≥5) discovered so far. The source, XBS J0216-0435, belongs to the XMM-Newton Bright Serendipitous Su…
Diffuse light and building history of the galaxy cluster Abell 2667
Kneib, J. -P.; Adami, C.; Slezak, E. +3 more
Aims.We searched for diffuse intracluster light in the galaxy cluster Abell 2667 (z=0.233) from HST images in three broad band-filters.
Methods: .We applied an iterative multi-scale wavelet analysis and reconstruction technique to these images, which allows to subtract stars and galaxies from the original images.
Results: .We detect a zone…
Coma revealed as an extended hard X-rays source by INTEGRAL IBIS/ISGRI
Terrier, R.; Bélanger, G.; Renaud, M. +2 more
Aims.We report the INTEGRAL/IBISobservations of the Coma Clusterin the hard X-ray/soft γ-raydomain.
Methods: .Since the Coma Clusterappears as an extended source, its global intensity and significance cannot be directly extracted with standard coded mask analysis. We used the method of imaging the extended sources with a coded mask telescope d…
Astrometric observations of Phobos and Deimos with the SRC on Mars Express
Oberst, J.; Neukum, G.; Hoffmann, H. +4 more
Observations of Phobos and Deimos, carried out by the SRC (Super Resolution Channel) on the Mars Express spacecraft between May 2004-April 2005, were used to determine the center-of-figure positions of the two Satellites with accuracies of 0.5-5 km (Phobos) and 1.0 km (Deimos). We find that the Phobos and Deimos orbit predictions from NASA-JPL (Je…
XMM-Newton X-ray and optical observations of the globular clusters M 55 and NGC 3201
Wheatley, P. J.; Webb, N. A.; Barret, D.
We have observed two low concentration Galactic globular clusters with the X-ray observatory XMM-Newton. We detect 47 faint X-ray sources in the direction of
Deep X-ray survey of the young open cluster NGC 2516 with XMM-Newton
Micela, G.; Sciortino, S.; Pillitteri, I. +1 more
Aims.We report a deep X-ray survey of the young (~140 Myr), rich open cluster NGC 2516 obtained with the EPIC camera on board the XMM-Newton satellite.
Methods: .By combining data from six observations, a high sensitivity, greater than a factor of 5 with respect to recent Chandra observations, has been achieved. Kaplan-Meier estimators of the …
High spatial resolution mid-infrared spectroscopy of the starburst galaxies NGC 3256, II Zw 40 and Henize 2-10
Schaerer, D.; Sauvage, M.; Tielens, A. G. G. M. +2 more
Aims.In order to show the importance of high spatial resolution observations of extra-galactic sources when compared to observations obtained with larger apertures such as ISO, we present N-band spectra (8-13 µm) of some locations in three starburst galaxies. In particular, we show the two galactic nuclei of the spiral galaxy NGC 3256, the c…
A statistical study of the characteristics of type II doublet radio bursts
Subramanian, K. R.; Ebenezer, E.
Aims.We study the characteristics of doublet type II radio bursts in which two type II bursts occur in sequence and investigate their drivers.
Methods: .37 type II bursts reported by the Culgoora radio observatory in the Solar Geophysical data for the period September 1994-July 2004 were used to determine their time and frequency characterist…