SEARCH FOR VHE {gamma}-RAY EMISSION FROM THE GLOBULAR CLUSTER M13 WITH THE MAGIC TELESCOPE

Journal Article · Tue Sep 01 00:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/702/1/266; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21333848

Anderhub, H; Biland, A ^[1]; Antonelli, L A ^[2]; Antoranz, P; Balestra, S; Barrio, J A; Bose, D ^[3]; Backes, M; Becker, J K ^[4]; Baixeras, C ^[5]; Bastieri, D; Bock, R K ^[6]; Becerra Gonzalez, J ^[7]; Bednarek, W; Berger, K ^[8]; Bernardini, E ^[9]; Bonnoli, G ^[10]; Bordas, P; Bosch-Ramon, V ^[11]; Borla Tridon, D ^[12]

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1. ETH Zurich, CH-8093 (Switzerland)
2. INAF National Institute for Astrophysics, I-00136 Rome (Italy)
3. Universidad Complutense, E-28040 Madrid (Spain)
4. Technische Universitaet Dortmund, D-44221 Dortmund (Germany)
5. Universitat Autonoma de Barcelona, E-08193 Bellaterra (Spain)
6. Universita di Padova and INFN, I-35131 Padova (Italy)
7. Inst. de AstrofIsica de Canarias, E-38200 La Laguna, Tenerife (Spain)
8. University of Lodz, PL-90236 Lodz (Poland)
9. Deutsches Elektronen-Synchrotron (DESY), D-15738 Zeuthen (Germany)
10. Universita di Siena, and INFN Pisa, I-53100 Siena (Italy)
11. Universitat de Barcelona (ICC/IEEC), E-08028 Barcelona (Spain)
12. Max-Planck-Institut fuer Physik, D-80805 Muenchen (Germany)

Based on MAGIC observations from 2007 June to July, we have obtained an integral upper limit to the VHE energy emission of the globular cluster M13 of F(E>200 GeV) < 5.1 x 10{sup -12} cm{sup -2} s{sup -1}, and differential upper limits for E > 140 GeV. Those limits allow us to constrain the population of millisecond pulsars within M13 and to test models for acceleration of leptons inside their magnetospheres and surrounding. We conclude that in M13 either millisecond pulsars are fewer than expected or they accelerate leptons less efficiently than predicted.

• OSTI ID: 21333848
• Journal Information: Astrophysical Journal, Vol. 702, Issue 1; Other Information: DOI: 10.1088/0004-637X/702/1/266; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ACCELERATION
EMISSION
GAMMA RADIATION
GEV RANGE 100-1000
LEPTONS
PULSARS
TELESCOPES