GAMMA-RAY OBSERVATIONS OF THE ORION MOLECULAR CLOUDS WITH THE FERMI LARGE AREA TELESCOPE
dc.contributor.author | ACKERMANN, Markus | |
dc.contributor.author | AJELLO, Marco | |
dc.contributor.author | ALLAFORT, A. | |
dc.contributor.author | ANTOLINI, E. | |
dc.contributor.author | BALDINI, Luca | |
hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
dc.contributor.author | BALLET, Jean | |
dc.contributor.author | BARBIELLINI, Guido | |
dc.contributor.author | BASTIERI, D. | |
dc.contributor.author | BECHTOL, K. | |
dc.contributor.author | BELLAZZINI, R. | |
dc.contributor.author | BERENJI, B. | |
dc.contributor.author | D. BLANDFORD, R. | |
dc.contributor.author | D. BLOOM, E. | |
dc.contributor.author | BONAMENTE, E. | |
dc.contributor.author | W. BORGLAND, A. | |
dc.contributor.author | BOTTACINI, E. | |
hal.structure.identifier | Institut de recherche en astrophysique et planétologie [IRAP] | |
dc.contributor.author | J. BRANDT, T. | |
dc.contributor.author | BREGEON, J. | |
dc.contributor.author | BRIGIDA, M. | |
hal.structure.identifier | Laboratoire Leprince-Ringuet [LLR] | |
dc.contributor.author | BRUEL, Pascal | |
dc.contributor.author | BUEHLER, R. | |
dc.contributor.author | BUSON, S. | |
dc.contributor.author | A. CALIANDRO, G. | |
dc.contributor.author | A. CAMERON, R. | |
dc.contributor.author | CARAVEO, P. A. | |
dc.contributor.author | CECCHI, C. | |
dc.contributor.author | CHEKHTMAN, A. | |
dc.contributor.author | CHIANG, J. | |
dc.contributor.author | CIPRINI, S. | |
dc.contributor.author | CLAUS, R. | |
hal.structure.identifier | Laboratoire Univers et Particules de Montpellier [LUPM] | |
dc.contributor.author | COHEN-TANUGI, J. | |
dc.contributor.author | CONRAD, J. | |
dc.contributor.author | D'AMMANDO, F. | |
dc.contributor.author | DE ANGELIS, A. | |
dc.contributor.author | DE PALMA, F. | |
dc.contributor.author | D. DERMER, C. | |
dc.contributor.author | DO COUTO E SILVA, E. | |
dc.contributor.author | S. DRELL, P. | |
dc.contributor.author | DRLICA-WAGNER, A. | |
dc.contributor.author | ENOTO, T. | |
dc.contributor.author | FALLETTI, L. | |
dc.contributor.author | FAVUZZI, C. | |
hal.structure.identifier | Laboratoire Leprince-Ringuet [LLR] | |
dc.contributor.author | J. FEGAN, S. | |
dc.contributor.author | C. FERRARA, E. | |
dc.contributor.author | B. FOCKE, W. | |
dc.contributor.author | FUKAZAWA, Y. | |
dc.contributor.author | FUKUI, Y. | |
dc.contributor.author | FUSCO, P. | |
dc.contributor.author | GARGANO, F. | |
dc.contributor.author | GASPARRINI, D. | |
dc.contributor.author | GERMANI, S. | |
dc.contributor.author | GIGLIETTO, N. | |
dc.contributor.author | GIORDANO, F. | |
dc.contributor.author | GIROLETTI, M. | |
dc.contributor.author | GLANZMAN, T. | |
dc.contributor.author | GODFREY, G. | |
dc.contributor.author | GUIRIEC, S. | |
dc.contributor.author | HADASCH, D. | |
dc.contributor.author | HANABATA, Y. | |
dc.contributor.author | K. HARDING, A. | |
dc.contributor.author | HAYASHIDA, M. | |
dc.contributor.author | HAYASHI, K. | |
hal.structure.identifier | Laboratoire Leprince-Ringuet [LLR] | |
dc.contributor.author | HORAN, D. | |
hal.structure.identifier | GLAST | |
dc.contributor.author | HOU, X. | |
dc.contributor.author | E. HUGHES, R. | |
dc.contributor.author | S. JACKSON, M. | |
dc.contributor.author | J 'OHANNESSON, G. | |
dc.contributor.author | S. JOHNSON, A. | |
dc.contributor.author | KAMAE, T. | |
dc.contributor.author | KATAGIRI, H. | |
dc.contributor.author | KATAOKA, J. | |
dc.contributor.author | KERR, M. | |
hal.structure.identifier | Institut de recherche en astrophysique et planétologie [IRAP] | |
dc.contributor.author | KNÖDLSEDER, Jürgen | |
dc.contributor.author | KUSS, M. | |
hal.structure.identifier | Institut de recherche en astrophysique et planétologie [IRAP] | |
dc.contributor.author | LANDE, J. | |
dc.contributor.author | LARSSON, S. | |
dc.contributor.author | LEE, S.-H. | |
dc.contributor.author | LONGO, F. | |
dc.contributor.author | LOPARCO, F. | |
dc.contributor.author | N. LOVELLETTE, M. | |
dc.contributor.author | LUBRANO, P. | |
dc.contributor.author | MAKISHIMA, K. | |
dc.contributor.author | N. MAZZIOTTA, M. | |
hal.structure.identifier | Laboratoire Univers et Particules de Montpellier [LUPM] | |
dc.contributor.author | MEHAULT, J. | |
dc.contributor.author | MITTHUMSIRI, W. | |
dc.contributor.author | A. MOISEEV, A. | |
dc.contributor.author | MONTE, C. | |
dc.contributor.author | E. MONZANI, M. | |
dc.contributor.author | MORSELLI, A. | |
dc.contributor.author | V. MOSKALENKO, I. | |
dc.contributor.author | MURGIA, S. | |
dc.contributor.author | NAKAMORI, T. | |
dc.contributor.author | NAUMANN-GODO, M. | |
dc.contributor.author | NISHINO, S. | |
dc.contributor.author | P. NORRIS, J. | |
hal.structure.identifier | Laboratoire Univers et Particules de Montpellier [LUPM] | |
dc.contributor.author | NUSS, E. | |
dc.contributor.author | OHNO, M. | |
dc.contributor.author | OHSUGI, T. | |
dc.contributor.author | OKUMURA, A. | |
dc.contributor.author | ORIENTI, M. | |
dc.contributor.author | ORLANDO, E. | |
dc.contributor.author | F. ORMES, J. | |
dc.contributor.author | OZAKI, M. | |
dc.contributor.author | PANEQUE, D. | |
dc.contributor.author | H. PANETTA, J. | |
dc.contributor.author | PARENT, D. | |
hal.structure.identifier | Laboratoire Univers et Particules de Montpellier [LUPM] | |
dc.contributor.author | PELASSA, V. | |
dc.contributor.author | PESCE-ROLLINS, M. | |
hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
dc.contributor.author | PIERBATTISTA, M. | |
hal.structure.identifier | Laboratoire Univers et Particules de Montpellier [LUPM] | |
dc.contributor.author | PIRON, F. | |
dc.contributor.author | PIVATO, G. | |
dc.contributor.author | PORTER, T.A. | |
dc.contributor.author | RAIN'O, S. | |
dc.contributor.author | RAZZANO, M. | |
dc.contributor.author | REIMER, A. | |
dc.contributor.author | REIMER, O. | |
dc.contributor.author | ROTH, M. | |
dc.contributor.author | F.-W. SADROZINSKI, H. | |
dc.contributor.author | SGR'O, C. | |
dc.contributor.author | J. SISKIND, E. | |
dc.contributor.author | SPANDRE, G. | |
dc.contributor.author | SPINELLI, P. | |
dc.contributor.author | W. STRONG, A. | |
dc.contributor.author | TAKAHASHI, H. | |
dc.contributor.author | TAKAHASHI, T. | |
dc.contributor.author | TANAKA, T. | |
dc.contributor.author | G. THAYER, J. | |
dc.contributor.author | B. THAYER, J. | |
dc.contributor.author | TIBOLLA, O. | |
dc.contributor.author | TINIVELLA, M. | |
dc.contributor.author | F. TORRES, D. | |
dc.contributor.author | TRAMACERE, A. | |
dc.contributor.author | TROJA, E. | |
dc.contributor.author | UCHIYAMA, Y. | |
dc.contributor.author | L. USHER, T. | |
dc.contributor.author | VANDENBROUCKE, J. | |
hal.structure.identifier | Laboratoire Univers et Particules de Montpellier [LUPM] | |
dc.contributor.author | VASILEIOU, V. | |
dc.contributor.author | VIANELLO, G. | |
dc.contributor.author | VITALE, V. | |
dc.contributor.author | P. WAITE, A. | |
dc.contributor.author | WANG, P. | |
dc.contributor.author | L. WINER, B. | |
dc.contributor.author | S. WOOD, K. | |
dc.contributor.author | YANG, Z. | |
dc.contributor.author | ZIMMER, S. | |
dc.date.issued | 2012 | |
dc.identifier.issn | 0004-637X | |
dc.description.abstractEn | We report on the gamma-ray observations of giant molecular clouds Orion A and B with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. The gamma-ray emission in the energy band between ∼100 MeV and ∼100 GeV is predicted to trace the gas mass distribution in the clouds through nuclear interactions between the Galactic cosmic rays (CRs) and interstellar gas. The gamma-ray production cross-section for the nuclear interaction is known to ∼10% precision which makes the LAT a powerful tool to measure the gas mass column density distribution of molecular clouds for a known CR intensity. We present here such distributions for Orion A and B, and correlate them with those of the velocity-integrated CO intensity (WCO) at a 1◦ × 1◦ pixel level. The correlation is found to be linear over a WCO range of ∼10-fold when divided in three regions, suggesting penetration of nuclear CRs to most of the cloud volumes. The WCO-to-mass conversion factor, XCO, is found to be ∼2.3 × 1020 cm−2 (K km s−1)−1 for the high-longitude part of Orion A (l > 212◦), ∼1.7 times higher than ∼1.3 × 1020 found for the rest of Orion A and B. We interpret the apparent high XCO in the high-longitude region of Orion A in the light of recent works proposing a nonlinear relation between H2 and CO densities in the diffuse molecular gas. WCO decreases faster than the H2 column density in the region making the gas "darker" to WCO. | |
dc.language.iso | en | |
dc.publisher | American Astronomical Society | |
dc.subject.en | gamma rays: ISM | |
dc.subject.en | ISM: clouds | |
dc.subject.en | ISM: general | |
dc.subject.en | ISM: individual objects (Orion A and Orion B) Online-only material: color figures | |
dc.title.en | GAMMA-RAY OBSERVATIONS OF THE ORION MOLECULAR CLOUDS WITH THE FERMI LARGE AREA TELESCOPE | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1088/0004-637X/756/1/4 | |
dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE] | |
dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE] | |
dc.identifier.arxiv | 1207.0616 | |
bordeaux.journal | The Astrophysical Journal | |
bordeaux.page | 4 | |
bordeaux.volume | 756 | |
bordeaux.peerReviewed | oui | |
hal.identifier | in2p3-00747339 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Non spécifiée | |
hal.origin.link | https://hal.archives-ouvertes.fr//in2p3-00747339v1 | |
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