INTEGRALSPI Limits on Electron‐Positron Annihilation Radiation from the Galactic Plane | Zendy

B. J. Teegarden | Zendy; Kenichi Watanabe | Zendy; P. Jean | Zendy; J. Knödlseder | Zendy; V. Lonjou | Zendy; J. P. Roques | Zendy; G. K. Skinner | Zendy; P. von Ballmoos | Zendy; G. Weidenspointner | Zendy; A. Bazzano | Zendy; Y. Butt | Zendy; A. Decourchelle | Zendy; A. C. Fabian | Zendy; A. Goldwurm | Zendy; M. Güdel | Zendy; Diana Hannikainen | Zendy; D. H. Hartmann | Zendy; A. Hornstrup | Zendy; W. H. G. Lewin | Zendy; K. Makishima | Zendy; J. Malzac | Zendy; J. M. Mïller | Zendy; A. N. Parmar | Zendy; Stephen P. Reynolds | Zendy; R. E. Rothschild | Zendy; V. Schönfelder | Zendy; J. A. Tomsick | Zendy; Jacco Vink | Zendy

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INTEGRALSPI Limits on Electron‐Positron Annihilation Radiation from the Galactic Plane

Author(s) -

B. J. Teegarden,

Kenichi Watanabe,

P. Jean,

J. Knödlseder,

V. Lonjou,

J. P. Roques,

G. K. Skinner,

P. von Ballmoos,

G. Weidenspointner,

A. Bazzano,

Y. Butt,

A. Decourchelle,

A. C. Fabian,

A. Goldwurm,

M. Güdel,

Diana Hannikainen,

D. H. Hartmann,

A. Hornstrup,

W. H. G. Lewin,

K. Makishima,

J. Malzac,

J. M. Mïller,

A. N. Parmar,

Stephen P. Reynolds,

R. E. Rothschild,

V. Schönfelder,

J. A. Tomsick,

Jacco Vink

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/426859

Subject(s) - physics , galactic plane , galaxy , annihilation , telescope , astrophysics , annihilation radiation , angular resolution (graph drawing) , radiation , galactic center , gamma ray , flux (metallurgy) , positron , spectrometer , astronomy , electron , nuclear physics , positron annihilation , optics , materials science , mathematics , combinatorics , metallurgy

The center of our Galaxy is a known strong source of electron-positron511-keV annihilation radiation. Thus far, however, there have been no reliabledetections of annihilation radiation outside of the central radian of ourGalaxy. One of the primary objectives of the INTEGRAL (INTErnational Gamma-RAyAstrophysics Laboratory) mission, launched in Oct. 2002, is the detailed studyof this radiation. The Spectrometer on INTEGRAL (SPI) is a high resolutioncoded-aperture gamma-ray telescope with an unprecedented combination ofsensitivity, angular resolution and energy resolution. We report results fromthe first 10 months of observation. During this period a significant fractionof the observing time was spent in or near the Galactic Plane. No positiveannihilation flux was detected outside of the central region (|l| > 40 deg) ofour Galaxy. In this paper we describe the observations and data analysismethods and give limits on the 511-keV flux.Comment: Accepted for publication in the Astrophysical Journal. 13 pages, 3 figure

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