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Your search keyword '"Lonjou, V."' showing total 4 results
Start Over Author "Lonjou, V." Topic astrophysics::galaxy astrophysics
4 results on '"Lonjou, V."'

1. Al(26) Studies with INTEGRAL's Spectrometer SPI

Author

Diehl, R., Kretschmer, K., Lichti, G., Sch��nfelder, V., Strong, A. W., von Kienlin, A., Kn��dlseder, J., Jean, P., Lonjou, V., Weidenspointner, G., Roques, J. -P., Vedrenne, G., Schanne, S., Mowlavi, N., Winkler, C., and Wunderer, C.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Al(26) radioactivity traces recent nucleosynthesis throughout the Galaxy, and is known to be produced in massive stars and novae. The map from its decay gamma-ray line suggests massive stars to dominate, but high-resolution line spectroscopy is expected to supplement imaging of Al(26) source regions and thus to help decide about the Al(26) injection process and interstellar environment, hence about the specific massive-star subgroup and phase which produces interstellar Al(26). The INTEGRAL Spectrometer SPI has observed Galactic Al(26) radioactivity in its 1809 keV gamma-ray line during its first inner-Galaxy survey. Instrumental background lines make analysis difficult; yet, a clear signal from the inner Galaxy agrees with expectations. In particular, SPI has constrained the line width to exclude previously-reported line broadenings corresponding to velocities >500 km/s. The signal-to-background ratio of percent implies that detector response and background modeling need to be fine-tuned to eventually enable line shape deconvolution in order to extract source location information along the line of sight., 6 pages; Proc. 5th INTEGRAL workshop, Munich, Feb. 2004

Published
2004

2. SPI observations of positron annihilation radiation from the 4th galactic quadrant: Sky distribution

Author

Weidenspointner, G., Lonjou, V., Knödlseder, J., Jean, P., Allain, M., Ballmoos, P., Harris, M. J., Skinner, G. K., Vedrenne, G., Teegarden, B. J., Gehrels, N., Nidhal Guessoum, Schönfelder, V., Chapuis, C., Durouchoux, Ph, Cisana, E., and Valsesia, M.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

During its first year in orbit the INTEGRAL observatory performed deep exposures of the Galactic Center region and scanning observations of the Galactic plane. We report on the status of our analysis of the positron annihilation radiation from the 4th Galactic quadrant with the spectrometer SPI, focusing on the sky distribution of the 511 keV line emission. The analysis methods are described; current constraints and limits on the Galactic bulge emission and the bulge-to-disk ratio are presented., 4 pages, 2 figures, accepted for publication in the proceedings of the 5th INTEGRAL workshop

3. SPI observations of positron annihilation radiation from the 4TH galactic quadrant: Spectroscopy

Author

Lonjou, V., Weidenspointner, G., Knödlseder, J., Jean, P., Allain, M., Ballmoos, P., Harris, M. J., Roques, J. P., Skinner, G. K., Teegarden, B. J., Gehrels, N., Nidhal Guessoum, Chapuis, C., Durouchoux, Ph, Cisana, E., and Valsesia, M.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

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 Exposures (GCDE) and from the Galactic Plane Scans (GPS). The analysis presented here is focused on the spectroscopic aspects of the electron/positron annihilation radiation. Background substraction and model fitting methods are described, and the parameters of the 511 keV line (flux, energy, and width) are deduced., Comment: 4 pages, 5 figures, accepted for publication in the proceedings of the 5th INTEGRAL Workshop (held in Munich, 2004)

4. The Fermi Gamma-Ray Space Telescope Discovers the Pulsar in the Young Galactic Supernova Remnant CTA 1

Author

M. N. Mazziotta, M. L. Kocian, T. H. Burnett, M. Ziegler, R. Rando, Jean Ballet, Sinéad McGlynn, Stefano Ciprini, C. Farnier, Diego F. Torres, C. C. Cheung, T. Reposeur, P. Fusco, Luca Baldini, Paul J. Wang, David Sánchez, Hideaki Katagiri, Elliott D. Bloom, Sylvain Guiriec, Brian L Winer, Andrea Tramacere, Y. Kanai, Stefan Funk, T. Kishishita, A. A. Moiseev, F. Longo, Roger W. Romani, Carmelo Sgrò, Jan Conrad, Steven Ritz, Pascal Bruel, E. Nuss, Gino Tosti, R. E. Hughes, David Paneque, M. Kuss, D. Parent, F. Loparco, H. Tajima, E. Do Couto E Silva, R. C. Hartman, Peter F. Michelson, F. Kuehn, Keith Bechtol, M. Ozaki, D. J. Thompson, P. D. Smith, Richard Dubois, T. A. Porter, J.H. Panetta, Melissa Pesce-Rollins, F. de Palma, J. G. Thayer, Hartmut Sadrozinski, David Smith, A. Sellerholm, T. Schalk, P. Lubrano, A. Sander, Teresa Mineo, Nicola Omodei, M. Razzano, L.S. Rochester, T. L. Usher, S. Rainò, P. Carlson, Tsunefumi Mizuno, M.-H. Grondin, Hajimu Yasuda, Hiromitsu Takahashi, E. Hays, G.L. Godfrey, Markus Roth, G. Bogaert, Tadayuki Takahashi, Paul S. Ray, B. M. Baughman, Stephen E. Thorsett, F. Gargano, L. Pieri, Emanuele Bonamente, J. E. Grove, Yasushi Fukazawa, A. A. Abdo, E. Orlando, E. Charles, Karen Watters, M. Dormody, E. J. Siskind, G. Piano, D. Dumora, Takaaki Tanaka, W. N. Johnson, A. De Angelis, Randall P. Johnson, Matthew Kerr, T. Ylinen, J. B. Thayer, P. L. Nolan, N. Gehrels, A. Reimer, W. B. Focke, N. Komin, B. Berenji, A. Chekhtman, N. Vilchez, Markus Ackermann, Luca Latronico, S. Germani, Claudia Cecchi, P. Spinelli, Y. Edmonds, Francesco Giordano, Ronaldo Bellazzini, D. J. Suson, L. R. Cominsky, A. Van Etten, Igor V. Moskalenko, J. F. Ormes, Jean-Luc Starck, Olaf Reimer, R. A. Cameron, A. Morselli, V. Pelassa, V. Vitale, Charles D. Dermer, J. Bregeon, Julie McEnery, A. W. Borgland, C. Meurer, C. Monte, A. S. Johnson, S. Cutini, M. Pepe, James Chiang, Roger Blandford, M. Marelli, Bulent Kiziltan, Matthew G. Baring, N. Kawai, A. Makeev, M. E. Monzani, Takeshi Nakamori, J. M. Casandjian, T. Ohsugi, S. W. Digel, T. J. Johnson, T. Glanzman, Denis Bastieri, Gudlaugur Johannesson, Felix Ryde, G. A. Caliandro, Guido Barbiellini, P. M. Saz Parkinson, V. Lonjou, A. Brez, Jürgen Knödlseder, R. Claus, W. Mitthumsiri, Gottfried Kanbach, Dario Gasparrini, B. Giebels, B. Lott, F. Piron, T. Kamae, N. Giglietto, S. Murgia, Masanori Ohno, L. Tibaldo, Alice K. Harding, W. B. Atwood, D. Davis, M. N. Lovellette, P. A. Caraveo, Persis S. Drell, Kent S. Wood, M. Brigida, A. Y. Rodriguez, L. Guillemot, I. A. Grenier, Atsushi Okumura, Gloria Spandre, Johann Cohen-Tanugi, M. S. Strickman, M. Lemoine-Goumard, Abdo, A. A., Ackermann, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bogaert, G., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carlson, P., Casandjian, J. M., Cecchi, C., Charles, E., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen Tanugi, J., Cominsky, L. R., Conrad, J., Cutini, S., Davis, D. S., Dermer, C. D., Angelis, A. d., Palma, F. d., Digel, S. W., Dormody, M., Silva, E. D. E., Drell, P. S., Dubois, R., Dumora, D., Edmonds, Y., Farnier, C., Focke, W. B., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I. A., Grondin, M. H., Grove, J. E., Guillemot, L., Guiriec, S., Harding, A. K., Hartman, R. C., Hays, E., Hughes, R. E., Johannesson, G., Johnson, A. S., Johnson, R. P., Johnson, T. J., Johnson, W. N., Kamae, T., Kanai, Y., Kanbach, G., Katagiri, H., Kawai, N., Kerr, M., Kishishita, T., Kiziltan, B., Knodlseder, J., Kocian, M. L., Komin, N., Kuehn, F., Kuss, M., Latronico, L., Lemoine Goumard, M., Longo, Francesco, Lonjou, V., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Makeev, A., Marelli, M., Mazziotta, M. N., Mcenery, J. E., Mcglynn, S., Meurer, C., Michelson, P. F., Mineo, T., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Nolan, P. L., Nuss, E., Ohno, M., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Ozaki, M., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce Rollins, M., Piano, G., Pieri, L., Piron, F., Porter, T. A., Raino, S., Rando, R., Ray, P. S., Razzano, M., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rochester, L. S., Rodriguez, A. Y., Romani, R. W., Roth, M., Ryde, F., Sadrozinski, H. F. W., Sanchez, D., Sander, A., Parkinson, P. M. S., Schalk, T. L., Sellerholm, A., Sgro, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Starck, J. L., Strickman, M. S., Suson, D. J., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Thayer, J. B., Thayer, J. G., Thompson, D. J., Thorsett, S. E., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Usher, T. L., Etten, A. V., Vilchez, N., Vitale, V., Wang, P., Watters, K., Winer, B. L., Wood, K. S., Yasuda, H., Ylinen, T., Ziegler, M., Département d'Astrophysique (ex SAP) (DAP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Astroparticules (LPTA), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'étude spatiale des rayonnements (CESR), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Roma Tor Vergata [Roma], Centre d'études scientifiques et techniques d'Aquitaine (CESTA), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), and Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Fermi satellite, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, High Energy Gamma-ray Astronomy, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Spitzer Space Telescope, Pulsar, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Supernova remnant, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, Nebula, Multidisciplinary, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Astronomy, Stars, Supernova, Fermi Gamma-ray Space Telescope
Abstract

Energetic young pulsars and expanding blast waves (supernova remnants, SNRs) are the most visible remains after massive stars, ending their lives, explode in core-collapse supernovae. The Fermi Gamma-Ray Space Telescope has unveiled a radio quiet pulsar located near the center of the compact synchrotron nebula inside the supernova remnant CTA 1. The pulsar, discovered through its gamma-ray pulsations, has a period of 316.86 ms, a period derivative of 3.614 x 10-13 s s-1 . Its characteristic age of 104 years is comparable to that estimated for the SNR. It is conjectured that most unidentified Galactic gamma ray sources associated with star-forming regions and SNRs are such young pulsars., 18 pages, 3 figures + supplemental material, published in Science Express, October 16, 2008, Contact authors: G. Kanbach, K. Wood, M. Ziegler

Published
2008
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