Search Publications
XMM-Newton observations of RR Telescopii: evidence for wind signatures and shocked gas emission
Selvelli, P.; González-Riestra, R.; Cassatella, A.
RR Telescopii is the prototype of the symbiotic novae class. Since its outburst in 1944, it has been slowly fading, and its emission-line spectrum has evolved significantly. In this paper we discuss XMM-Newton observations of RR Tel taken in April 2009. These are the first X-ray high-resolution spectra of this system, and they provide important in…
On the role of current dissipation in the energization of coronal bright points
Adamson, E.; Otto, A.; Büchner, J.
Aims: In the context of the contributions by DC dissipation to the energization of solar coronal X-ray and EUV bright points, we analyze the role of Joule heating in the formation of X-ray and EUV coronal bright points through current dissipation due to anomalous resistivity.
Methods: We utilized the improved resistive MHD simulation cod…
Resolving the molecular gas around the lensed quasar RXJ0911.4+0551
Kneib, J. -P.; Salomé, P.; Beelen, A. +5 more
We report on high angular resolution observations of the CO(7-6) line and millimeter continuum in the host galaxy of the gravitationally lensed (z ~ 2.8) quasar
Suzaku observations of the low surface brightness cluster A76
Böhringer, H.; Chon, G.; Ota, N. +2 more
Aims: We present the results of Suzaku observations of a nearby galaxy cluster,
Spectroscopy of diffuse light in dust clouds. Scattered light and the solar neighbourhood radiation field
Lehtinen, K.; Mattila, K.
Context. The optical surface brightness of dark nebulae is mainly due to scattering of integrated starlight by classical dust grains. It contains information on the impinging interstellar radiation field, cloud structure, and grain scattering properties. We have obtained spectra of the scattered light from 3500 to 9000 Å in two globules, the Thumb…
Supernova remnant G296.7-0.9 in X-rays
Becker, W.; Prinz, T.
Aims: We present a detailed study of the supernova remnant G296.7-0.9 in the 0.2-12 keV X-ray band.
Methods: Using data from XMM-Newton, we performed a spectro-imaging analysis of G296.7-0.9 in order to deduce the basic parameters of the remnant and search for evidence of a young neutron star associated with it.
Results: In X-rays t…
The 54-day orbital period of AX J1820.5-1434 unveiled by Swift
Campana, S.; Cusumano, G.; Masetti, N. +3 more
Context. The hard X-ray survey that Swift Burst Alert Telescope (BAT) has been performing since late 2004 provides a considerable database for a large number of sources, whose hard X-ray emission are poorly known.
Aims: We exploit the BAT survey archive to improve the temporal and spectral characterization of the Galactic hard-X-ray sources. …
Multi-band constraints on the nature of emission line galaxies
Capetti, A.; Balmaverde, B.
Our aim is to explore the nature of emission line galaxies by combining high-resolution observations obtained in different bands to understand which objects are powered by an active galactic nucleus (AGN). From the spectroscopic Palomar survey of nearby bright galaxies, we selected a sample of 18 objects observed with Hubble Space Telescope (HST),…
CV1 in the globular cluster M 22: confirming its nature through X-ray observations and optical spectroscopy
Servillat, M.; Webb, N. A.
Context. Observations of cataclysmic variables in globular clusters appear to show a dearth of outbursts compared to those observed in the field. A number of explanations have been proposed, including low mass-transfer rates and/or moderate magnetic fields implying higher mass white dwarfs than the average observed in the field. Alternatively this…
The molecular envelope of CRL 618: A new model based on Herschel/HIFI observations
Alcolea, J.; Bujarrabal, V.; Soria-Ruiz, R.
Aims: We study the physical properties and molecular excitation of the different warm gas components found in the protoplanetary nebula CRL 618. The proper study of the nebular structure and its implications on the dynamics and kinematics of the molecular gas are of particular importance for understanding the evolution of these objects.
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