SEARCH FOR ANISOTROPIES IN COSMIC-RAY POSITRONS DETECTED BY THE PAMELA EXPERIMENT

被引：17

作者：

Adriani, O. ^{[1
,2
]}

Barbarino, G. C. ^{[3
,4
]}

Bazilevskaya, G. A. ^{[5
]}

Bellotti, R. ^{[6
,7
]}

Boezio, M. ^{[8
]}

Bogomolov, E. A. ^{[9
]}

Bongi, M. ^{[1
,2
]}

Bonvicini, V. ^{[8
]}

Bottai, S. ^{[2
]}

Bruno, A. ^{[6
]}

Cafagna, F. ^{[7
]}

Campana, D. ^{[4
]}

Carlson, P. ^{[10
,11
]}

Casolino, M. ^{[12
,13
]}

Castellini, G. ^{[14
]}

De Donato, C. ^{[12
,15
]}

De Santis, C. ^{[12
,15
]}

De Simone, N. ^{[12
]}

Di Felice, V. ^{[12
,16
]}

Formato, V. ^{[8
,17
]}

Galper, A. M. ^{[18
]}

Giaccari, U. ^{[4
,19
]}

Karelin, A. V. ^{[18
]}

Koldashov, S. V. ^{[18
]}

Koldobskiy, S. ^{[18
]}

Krutkov, S. Y. ^{[9
]}

Kvashnin, A. N. ^{[5
]}

Leonov, A. ^{[18
]}

Malakhov, V. ^{[18
]}

Marcelli, L. ^{[12
,15
]}

Martucci, M. ^{[15
,20
]}

Mayorov, A. G. ^{[18
]}

Menn, W. ^{[21
]}

Merge, M. ^{[12
,15
]}

Mikhailov, V. V. ^{[18
]}

Mocchiutti, E. ^{[8
]}

Monaco, A. ^{[6
,7
]}

Mori, N. ^{[1
,2
]}

Munini, R. ^{[17
]}

Osteria, G. ^{[4
]}

Palma, F. ^{[12
,15
]}

Panico, B. ^{[4
]}

Papini, P. ^{[2
]}

Pearce, M. ^{[10
,11
]}

Picozza, P. ^{[12
,15
]}

Ricci, M. ^{[19
]}

Ricciarini, S. B. ^{[2
,14
]}

Sarkar, R. ^{[8
,22
]}

Scotti, V. ^{[3
,4
]}

Simon, M. ^{[20
]}

机构：

[1] Univ Florence, Dept Phys & Astron, I-50019 Florence, Italy

[2] Ist Nazl Fis Nucl, Sez Firenze, I-50019 Florence, Italy

[3] Univ Naples Federico II, Dept Phys, I-80126 Naples, Italy

[4] Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy

[5] Lebedev Phys Inst, RU-119991 Moscow, Russia

[6] Univ Bari, Dept Phys, I-70126 Bari, Italy

[7] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

[8] Ist Nazl Fis Nucl, Sez Trieste, I-34149 Trieste, Italy

[9] Ioffe Phys Tech Inst, RU-194021 St Petersburg, Russia

[10] KTH, Dept Phys, SE-10691 Stockholm, Sweden

[11] Alballova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden

[12] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy

[13] RIKEN, Adv Sci Inst, Wako, Saitama, Japan

[14] IFAC, I-50019 Florence, Italy

[15] Univ Roma Tor Vergata, Dept Phys, I-00133 Rome, Italy

[16] Agenzia Spaziale Italiana ASI, Sci Data Ctr, I-00133 Rome, Italy

[17] Univ Trieste, Dept Phys, I-34147 Trieste, Italy

[18] Natl Res Nucl Univ MEPhI, RU-115409 Moscow, Russia

[19] Univ Fed Rio de Janeiro, Inst Fis, Rio De Janeiro, RJ, Brazil

[20] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[21] Univ Siegen, Dept Phys, D-57068 Siegen, Germany

[22] Ist Nazl Fis Nucl, Sez Trieste, I-34149 Trieste, Italy

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 811卷 / 01期

基金：

瑞典研究理事会;

关键词：

astroparticle physics; cosmic rays; ORIGIN; FLUX;

D O I：

10.1088/0004-637X/811/1/21

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The. Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) detector was launched on board the Russian Resurs-DK1 satellite on 2006 June 15. The data collected during the first four years have been used to search for large-scale anisotropies in the arrival directions of cosmic ray positrons. The PAMELA experiment allows for a full sky investigation, with sensitivity to global anisotropies in any angular window of the celestial sphere. Data samples of positrons in the rigidity range of 10 GV <= R <= 200 GV were analyzed. This article discusses the method and the results of the search for possible local sources through the analysis of anisotropy in positron data compared to the proton background. The resulting distributions of arrival directions are found to be isotropic. Starting from the angular power spectrum, a dipole anisotropy upper limit of delta = 0.076 at the 95% confidence level is determined. An additional search is carried out around the Sun. No evidence of an excess correlated with that direction was found.

引用

页数：9

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