V
V. Schönfelder
Researcher at Max Planck Society
Publications - 240
Citations - 6606
V. Schönfelder is an academic researcher from Max Planck Society. The author has contributed to research in topics: Gamma ray & Galaxy. The author has an hindex of 33, co-authored 240 publications receiving 6264 citations.
Papers
More filters
Journal ArticleDOI
The INTEGRAL mission
Christoph Winkler,Thierry J.-L. Courvoisier,G. Di Cocco,Neil Gehrels,A. Giménez,A. Giménez,S. A. Grebenev,W. Hermsen,J. M. Mas-Hesse,J. M. Mas-Hesse,Francois Lebrun,Niels Lund,Giorgio G. C. Palumbo,J. A. Paul,J. P. Roques,Herbert W. Schnopper,V. Schönfelder,R. A. Sunyaev,Bonnard J. Teegarden,P. Ubertini,G. Vedrenne,A. J. Dean +21 more
TL;DR: The International Gamma-Ray Astrophysics Laboratory (INTEGRAL) as mentioned in this paper is dedicated to the fine spectroscopy (2.5 × 1.5 ) and fine imaging (angular resolution: 12 arcmin FWHM) of celestial gamma-ray sources in the energy range 15 −keV to 10 −MeV with concurrent source monitoring in the X −ray and optical (V −band, 550 −nm) energy ranges.
Journal ArticleDOI
Radioactive 26Al from massive stars in the Galaxy.
Roland Diehl,Hubert Halloin,K. Kretschmer,G. G. Lichti,V. Schönfelder,Andrew W. Strong,Andreas von Kienlin,Wei Wang,Pierre Jean,Jürgen Knödlseder,J. P. Roques,Georg Weidenspointner,Stéphane Schanne,Dieter H. Hartmann,Christoph Winkler,Cornelia B. Wunderer +15 more
TL;DR: High spectral resolution measurements of 26Al emission at 1808.65 keV demonstrate that the 26Al source regions corotate with the Galaxy, supporting its Galaxy-wide origin and determining a present-day equilibrium mass of 2.8 (± 0.8) solar masses of 27Al.
Journal ArticleDOI
SPI: The spectrometer aboard INTEGRAL
G. Vedrenne,J. P. Roques,V. Schönfelder,P. Mandrou,G. G. Lichti,A. von Kienlin,Bertrand Cordier,Stéphane Schanne,Jürgen Knödlseder,Gerald K. Skinner,Pierre Jean,F. Sanchez,P. A. Caraveo,Bonnard J. Teegarden,P. von Ballmoos,Laurent Bouchet,P. Paul,James L. Matteson,Steven E. Boggs,Cornelia B. Wunderer,Pierre Leleux,Georg Weidenspointner,Georg Weidenspointner,Ph. Durouchoux,Roland Diehl,Andrew W. Strong,M. Casse,M. A. Clair,Y. André +28 more
TL;DR: SPI as discussed by the authors is a high spectral resolution gamma-ray telescope on board the ESA mission INTEGRAL (International Gamma Ray Astrophysics Laboratory), which consists of an array of 19 closely packed germanium detectors surrounded by an active anticoincidence shield of BGO.
Journal ArticleDOI
Early SPI/INTEGRAL measurements of 511 keV line emission from the 4th quadrant of the Galaxy
Pierre Jean,Jürgen Knödlseder,V. Lonjou,Marc Allain,Jean-Pierre Roques,Gerald K. Skinner,Bonnard J. Teegarden,Bonnard J. Teegarden,G. Vedrenne,P. von Ballmoos,Bertrand Cordier,P. A. Caraveo,Roland Diehl,Ph. Durouchoux,P. Mandrou,James L. Matteson,N. Gehrels,V. Schönfelder,Andrew W. Strong,P. Ubertini,Georg Weidenspointner,Georg Weidenspointner,C. Winkler +22 more
TL;DR: In this paper, the first measurements of the 511 keV line emission from the Galactic Centre (GC) region performed with the spectrometer SPI on the space observatory INTEGRAL (International Gamma-Ray Astrophysics Laboratory).
Journal ArticleDOI
The Soft Gamma-Ray Spectral Variability of Cygnus X-1
Mark L. McConnell,Andrzej A. Zdziarski,K. Bennett,H. Bloemen,Werner Collmar,W. Hermsen,L. Kuiper,W. S. Paciesas,Bernard F. Phlips,Juri Poutanen,James M. Ryan,V. Schönfelder,Helmut Steinle,Andrew W. Strong +13 more
TL;DR: In this paper, the authors used observations of Cyg X-1 from the Compton Gamma Ray Observatory and BeppoSAX to study the variation in the MeV γ-ray emission between the hard and soft spectral states, using spectra that cover the energy range from 20 keV up to 10 MeV.