Soft gamma-ray optics: new Laue lens design and performance estimates (2009)
Barriere, N., Natalucci, L., Abrosimov, N., Von Ballmoos, P., Bastie, P., Courtois, P., ...
Laue lenses are an emerging technology based on diffraction in crystals that allows the concentration of soft gamma rays. This kind of optics that works in the 100 keV - 1.5 MeV band can be used to...
Fermi LAT Measurements of the Gamma-Ray Emission from the Large Magellanic Cloud (2009)
Apart from the Milky Way, the Large Magellanic Cloud (LMC) is the only other normal star-forming galaxy that was conclusively detected in high energy (> 100 MeV) gamma rays by the Energetic Gamma Ray...
Fermi Discovery of Gamma-Ray Emission from Ngc 1275 (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Asano, K., Baldini, L., Ballet, J., ...
R and D progress on second-generation crystals for Laue lens applications (2008)
Barrière, N., Von Ballmoos, P., Bastie, P., Courtois, P., V. Abrosimov, N., Andersen, K., ...
The concept of a gamma-ray telescope based on a Laue lens offers the possibility to increase the sensitivity by more than an order of magnitude with respect to existing instruments. Laue lenses have...
R and D progress on second-generation crystals for Laue lens applications (2008)
Barrière, N., Von Ballmoos, P., Bastie, P., Courtois, P., V. Abrosimov, N., Andersen, K., ...
The concept of a gamma-ray telescope based on a Laue lens offers the possibility to increase the sensitivity by more than an order of magnitude with respect to existing instruments. Laue lenses have...
R and D progress on second-generation crystals for Laue lens applications (2008)
Barrière, N., Von Ballmoos, P., Bastie, P., Courtois, P., V. Abrosimov, N., Andersen, K., ...
The concept of a gamma-ray telescope based on a Laue lens offers the possibility to increase the sensitivity by more than an order of magnitude with respect to existing instruments. Laue lenses have...
R&D progress on second-generation crystals for Laue lens applications (2008)
Barrière, N., Von Ballmoos, P., Bastie, P., Courtois, P., Abrosimov, N. V., Andersen, K., ...
The concept of a gamma-ray telescope based on a Laue lens offers the possibility to increase the sensitivity by more than an order of magnitude with respect to existing instruments. Laue lenses have...
The signature of 44Ti in Cassiopeia A revealed by IBIS/ISGRI on INTEGRAL (2006)
Renaud, M., Vink, J., Decourchelle, A., Lebrun, F., Hartog, P. R. Den, Terrier, R., ...
We report the detection of both the 67.9 and 78.4 keV 44Sc gamma-ray lines in Cassiopeia A with the INTEGRAL IBIS/ISGRI instrument. Besides the robustness provided by spectro-imaging observations,...
The Scientific Objectives of the SPIRAL2 project (2006)
Ackermann, D., Adoui, L., De Angelis, G., Auger, G., Aumann, T., Azaiez, F., ...
The Scientific Objectives of the SPIRAL2 project (2006)
Ackermann, D., Adoui, L., De Angelis, G., Auger, G., Aumann, T., Azaiez, F., ...
The Scientific Objectives of the SPIRAL2 project (2006)
Ackermann, D., Adoui, L., De Angelis, G., Auger, G., Aumann, T., Azaiez, F., ...
The Scientific Objectives of the SPIRAL2 project (2006)
Ackermann, D., Adoui, L., De Angelis, G., Auger, G., Aumann, T., Azaiez, F., ...
Spectral analysis of the Galactic e+e- annihilation emission (2005)
Jean, P., Knodlseder, J., Gillard, W., Guessoum, N., Ferriere, K., Marcowith, A., ...
We present a spectral analysis of the e+e- annihilation emission from the Galactic Centre region based on the first year of measurements made with the spectrometer SPI of the INTEGRAL mission. We...
Exploring the Hard X-/soft gamma-ray Continuum Spectra with Laue Lenses (2005)
Frontera, F., Pisa, A., De Chiara, P., Loffredo, G., Pellicciotta, D., Carassiti, V., ...
The history of X-ray astronomy has shown that any advancement in our knowledge of the X-ray sky is strictly related to an increase in instrument sensitivity. At energies above 60 keV, there are...
Lonjou, V., Knodlseder, J., Roques, J. P., Skinner, G. K., Von Ballmoos, P., Jean, P., ...
The status of the SPI energy calibration after the first year of INTEGRAL operations is reported. We have studied the gain variations and we have demonstrated that the most important parameter is the...
Detection of gamma-ray lines from interstellar 60Fe by the high resolution spectrometer SPI (2005)
Harris, M. J., Knodlseder, J., Jean, P., Cisana, E., Diehl, R., Lichti, G. G., ...
It is believed that core-collapse supernovae (CCSN), occurring at a rate about once per century, have seeded the interstellar medium with long-lived radioisotopes such as 60Fe (half-life 1.5 Myr),...
Lonjou, V., Weidenspointner, G., Knodlseder, J., Jean, P., Allain, M., Von Ballmoos, P., ...
The status of the analysis of the electron/positron annihilation radiation performed by INTEGRAL/SPI in the 4th GALACTIC QUADRANT is reported. We use data from the first two Galactic Center Deep...
INTEGRAL/SPI Limits on Electron-Positron Annihilation Radiation from the Galactic Plane (2004)
Teegarden, B. J., Watanabe, K., Jean, P., Knodlseder, J., Lonjou, V., Roques, J. P., ...
The center of our Galaxy is a known strong source of electron-positron 511-keV annihilation radiation. Thus far, however, there have been no reliable detections of annihilation radiation outside of...
INTEGRAL observations of the Large Magellanic Cloud region (2004)
Mereghetti, S., Gotz, D., Paizis, A., Pellizzoni, A., Vercellone, S., Westergaard, N. J., ...
We present the preliminary results of the INTEGRAL survey of the Large Magellanic Cloud. The observations have been carried out in January 2003 (about 10^6 s) and January 2004 (about 4x10^5 s). Here...
Search for gamma-ray line emission from the radioactive decay of 60Fe with SPI (2004)
Knodlseder, J., Cisana, E., Diehl, R., Lichti, G., Harris, M., Jean, P., ...
The search for gamma-ray line emission from the radioactive decay of 60Fe figures among the prime scientific objectives of the INTEGRAL mission. 60Fe is believed to be primarily produced in...
Knodlseder, J., Lonjou, V., Jean, P., Allain, M., Mandrou, P., ...
We provide first constraints on the morphology of the 511 keV line emission from the galactic centre region on basis of data taken with the spectrometer SPI on the INTEGRAL gamma-ray observatory. The...
First identification and modelling of SPI background lines (2003)
Weidenspointner, G., Kiener, J., Gros, M., Jean, P., Teegarden, BJ., Wunderer, C., ...
INTEGRAL/SPI ground calibration (2003)
Attie, D., Cordier, B., Gros, M., Laurent, P., Schanne, S., Tauzin, G., ...
First identification and modelling of SPI background lines (2003)
Weidenspointner, G., Kiener, J., Gros, M., Jean, P., Teegarden, BJ., Wunderer, C., ...
INTEGRAL/SPI ground calibration (2003)
Attie, D., Cordier, B., Gros, M., Laurent, P., Schanne, S., Tauzin, G., ...
First identification and modelling of SPI background lines (2003)
Weidenspointner, G., Kiener, J., Gros, M., Jean, P., Teegarden, BJ., Wunderer, C., ...
On Oct. 17, 2002, the ESA INTEGRAL observatory was launched into a highly elliptical orbit. SPI, a high resolution Ge spectrometer covering an energy range of 20-8000 keV, is one of its two main...
SPI instrumental background characteristics (2003)
Jean, P., Vedrenne, G., Roques, J.P., Schonfelder, V., Teegarden, B.J., Von Kienlin, A., ...
In its space environment the INTEGRAL observatory is subject to an intense irradiation by energetic cosmic-ray particles that leads, via nuclear interactions with the telescope and spacecraft...
First identification and modelling of SPI background lines (2003)
Weidenspointner, G., Kiener, J., Gros, M., Jean, P., Teegarden, BJ., Wunderer, C., ...
On Oct. 17, 2002, the ESA INTEGRAL observatory was launched into a highly elliptical orbit. SPI, a high resolution Ge spectrometer covering an energy range of 20-8000 keV, is one of its two main...
SPI instrumental background characteristics (2003)
Jean, P., Vedrenne, G., Roques, J.P., Schonfelder, V., Teegarden, B.J., Von Kienlin, A., ...
In its space environment the INTEGRAL observatory is subject to an intense irradiation by energetic cosmic-ray particles that leads, via nuclear interactions with the telescope and spacecraft...
First identification and modelling of SPI background lines (2003)
Weidenspointner, G., Kiener, J., Gros, M., Jean, P., Teegarden, BJ., Wunderer, C., ...
On Oct. 17, 2002, the ESA INTEGRAL observatory was launched into a highly elliptical orbit. SPI, a high resolution Ge spectrometer covering an energy range of 20-8000 keV, is one of its two main...
SPI instrumental background characteristics (2003)
Jean, P., Vedrenne, G., Roques, J.P., Schonfelder, V., Teegarden, B.J., Von Kienlin, A., ...
In its space environment the INTEGRAL observatory is subject to an intense irradiation by energetic cosmic-ray particles that leads, via nuclear interactions with the telescope and spacecraft...
Gamma-ray line emission from OB associations and young open clusters. II. The Cygnus region (2002)
Knodlseder, J., Cervino, M., Duigou, J. -M. Le, Meynet, G., Schaerer, D., Von Ballmoos, P.
Gamma-ray and microwave observations of the Cygnus region reveal an intense signal of 1.809 MeV line emission, attributed to radioactive decay of 26Al, that is closely correlated with 53 GHz...
Confidence limits of evolutionary synthesis models III. On time-integrated quantities (2001)
Cervino, M., Gomez-Flechoso, M. A., Castander, F. J., Schaerer, D., Molla, M., Knodlseder, J., ...
Evolutionary synthesis models are a fundamental tool to interpret the properties of observed stellar systems. In order to achieve a meaningful comparison between models and real data, it is necessary...
The Cygnus X region: a nucleosynthesis laboratory for INTEGRAL (2001)
Knodlseder, J., Cervino, M., Schaerer, D., Von Ballmoos, P., Meynet, G.
The detection of 1.809 MeV gamma-ray line emission from the Cygnus X complex by the COMPTEL telescope is one of the most convincing proves of massive star nucleosynthesis in our Galaxy. The Cygnus X...
Flat-Fielding BATSE Occultation Data for use in a Hard X-Ray All Sky Survey (2001)
Shaw, S. E., Bird, A. J., Dean, A. J., Diallo, N., Ferguson, C., Knodlseder, J., ...
The BATSE mission aboard CGRO can be used to observe hard X-ray sources by using the Earth occultation method. This method relies on measuring a step in the count rate profile in each BATSE detector...
Cervino, M., Knodlseder, J., Schaerer, D., Von Ballmoos, P., Meynet, G.
We have developed a new diagnostic tool for the study of gamma-ray emission lines from radioactive isotopes (such as 26Al and 60Fe in conjunction with other multi-wavelength observables of Galactic...
Cygnus OB2 - a young globular cluster in the Milky Way (2000)
The morphology and stellar content of the Cygnus OB2 association has been determined using 2MASS infrared observations in the J, H, and K bands. The analysis reveals a spherically symmetric...
Image Reconstruction of COMPTEL 1.8 MeV 26Al Line Data (1999)
Knodlseder, J., Dixon, D., Bennett, K., Bloemen, H., Diehl, R., Hermsen, W., ...
We present a new algorithm, called Multiresolution Regularized Expectation Maximization (MREM), for the reconstruction of gamma-ray intensity maps from COMPTEL data. The algorithm is based on the...
Assessment of Tracers of 1.8 MeV Emission (1999)
Knodlseder, J., Diehl, R., Oberlack, U., Von Ballmoos, P., Bloemen, H., Hermsen, W., ...
We examined the question of a possible correlation between 1.8 MeV emission and intensity distributions observed at other wavelengths by comparing the 1.8 MeV data to an extended set of all-sky maps,...
A New Look at Image Reconstruction of COMPTEL 1.8 MeV Data (1999)
Knodlseder, J., Dixon, D., Diehl, R., Oberlack, U., Von Ballmoos, P., Bloemen, H., ...
Deconvolving COMPTEL gamma-ray data into images presents a major methodological challenge. We developed a new algorithm called Multiresolution Regularized Expectation Maximization (MREM), which...