Search Publications
Coronal emission from the shocked circumstellar ring of SN 1987A
Lundqvist, P.; Spyromilio, J.; Gröningsson, P. +5 more
High resolution spectra with UVES/VLT of SN 1987A from December 2000 until November 2005 show a number of high ionization lines from gas with velocities of ± 350 km s-1, emerging from the shocked gas formed by the ejecta-ring collision. These include coronal lines from [Fe X], [Fe XI] and [Fe XIV] which have increased by a factor of 20 …
Interplanetary Lyman α line profiles: variations with solar activity cycle
Schmidt, W.; Bertaux, J. -L.; Lallement, R. +4 more
Aims.Interplanetary Lyman α line profiles are derived from the SWAN H cell data measurements. The measurements cover a 6-year period from solar minimum (1996) to after the solar maximum of 2001. This allows us to study the variations of the line profiles with solar activity.
Methods: .These line profiles were used to derive line shifts and lin…
Shock-cloud interaction in the Vela SNR. II. Hydrodynamic model
Miceli, M.; Bocchino, F.; Orlando, S. +1 more
Context: .In the framework of the study of the X-ray and optical emission in supernova remnants we focus on an isolated X-ray knot in the northern rim of the Vela SNR (Vela FilD), whose X-ray emission has been studied and discussed in Paper I.
Aims: .We aim at understanding the physical origin of the X-ray and optical emission in FilD, at unde…
Oxygen-rich disk in the V778 Cygni system resolved
Szczerba, R.; Richards, A. M. S.; Poutanen, J. +3 more
Aims.Various scenarios have been proposed to explain the presence of silicate features associated with carbon stars, such as
Methods: .The 22 GHz water maser emission from this star has been mapped using MERLIN wit…
Interstellar abundances in the neutral and ionized gas of NGC 604
Kunth, D.; Lebouteiller, V.; Vidal-Madjar, A. +5 more
Aims.We present FUSE spectra of the giant H ii region NGC 604 in the spiral galaxy M 33. Chemical abundances are tentatively derived from far-UV absorption lines and compared to those derived from optical emission lines.
Methods: .Absorption lines from neutral hydrogen and heavy elements were observed against the continuum provided by the youn…
XMM-Newton observation of the bright Seyfert 1 galaxy, MCG+8-11-11
de Rosa, A.; Perola, G. C.; Bianchi, S. +2 more
We report on the XMM-Newton observation of the bright Seyfert 1 galaxy, MCG+8-11-11. Data from the EPIC/p-n camera, the Reflection Gratings Spectrometers (RGS), and the Optical Monitor (OM) were analyzed. The p-n spectrum was fitted well by a power law, a spectrally unresolved Fe Kα line, a Compton reflection component (whose high value, when comp…
The K-band properties of Seyfert 2 galaxies
Zhao, Y.; Melnick, J.; Gu, Q. +1 more
Aims. It is well known that the [O iii]λ5007 emission line and hard X-ray (2-10 keV) luminosities are good indicators of AGN activities and that the near and mid-infrared emission of AGN originates from re-radiation of dusty clouds heated by the UV/optical radiation from the accretion disk. In this paper we present a study of the near-infrared K-b…
First high spectral resolution VUV full-Sun spectrum compared to cool stars
Peter, Hardi
This paper reports the first full-Sun vacuum ultraviolet (VUV) emission line profile originating from the transition region from the chromosphere to the corona. It is based on a raster scan of the whole solar disk using SUMER/SOHO. The full-Sun spectrum has a spectral resolution which allows an investigation of details in the line profile as well …
An INTEGRAL hard X-ray survey of the Large Magellanic Cloud
Götz, D.; Mereghetti, S.; Belloni, T. +2 more
Two observation campaigns in 2003 and 2004 with the INTEGRAL satellite have provided the first sensitive survey of the Large Magellanic Cloud with an imaging instrument in the hard X-ray range (15 keV-10 MeV). The high energy flux and long-term variability of the black hole candidate LMC X-1 was measured for the first time without contamination by…
The magnetic Bp star 36 Lyncis. I. Magnetic and photospheric properties
Petit, P.; Smith, M. A.; Wade, G. A. +8 more
Aims.This paper reports the photospheric, magnetic and circumstellar gas characteristics of the magnetic B8p star 36 Lyncis (HD 79158).
Methods: .Using archival data and new polarised and unpolarised high-resolution spectra, we redetermine the basic physical properties, the rotational period and the geometry of the magnetic field, and the phot…