FIRST NEUTRINO POINT-SOURCE RESULTS FROM THE 22 STRING ICECUBE DETECTOR

Journal Article · Mon Aug 10 04:00:00 EDT 2009 · Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/701/1/L47; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21313656

Abbasi, R; Aguilar, J; Andeen, K; Baker, M ^[1]; Abdou, Y ^[2]; Ackermann, M; Bazo Alba, J L; Benabderrahmane, M L; Berdermann, J ^[3]; Adams, J ^[4]; Ahlers, M ^[5]; Auffenberg, J; Becker, K -H ^[6]; Bai, X ^[7]; Barwick, S W ^[8]; Bay, R ^[9]; Beattie, K ^[10]; Beatty, J J ^[11]; Bechet, S ^[12]

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1. Department of Physics, University of Wisconsin, Madison, WI 53706 (United States)
2. Department of Subatomic and Radiation Physics, University of Gent, B-9000 Gent (Belgium)
3. DESY, D-15735 Zeuthen (Germany)
4. Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch (New Zealand)
5. Department of Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP (United Kingdom)
6. Department of Physics, University of Wuppertal, D-42119 Wuppertal (Germany)
7. Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States)
8. Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)
9. Department of Physics, University of California, Berkeley, CA 94720 (United States)
10. Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States)
11. Department of Physics and Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, OH 43210 (United States)
12. Universite Libre de Bruxelles, Science Faculty CP230, B-1050 Brussels (Belgium)

We present new results of searches for neutrino point sources in the northern sky, using data recorded in 2007-2008 with 22 strings of the IceCube detector (approximately one-fourth of the planned total) and 275.7 days of live time. The final sample of 5114 neutrino candidate events agrees well with the expected background of atmospheric muon neutrinos and a small component of atmospheric muons. No evidence of a point source is found, with the most significant excess of events in the sky at 2.2{sigma} after accounting for all trials. The average upper limit over the northern sky for point sources of muon-neutrinos with E {sup -2} spectrum is E{sup 2} {phi}{sub {nu}{sub {mu}}}< 1.4 x 10{sup -11} TeV cm{sup -2} s{sup -1}, in the energy range from 3 TeV to 3 PeV, improving the previous best average upper limit by the AMANDA-II detector by a factor of 2.

• OSTI ID: 21313656
• Journal Information: Astrophysical Journal (Online), Journal Name: Astrophysical Journal (Online) Journal Issue: 1 Vol. 701; ISSN 1538-4357
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
ACCELERATION
COSMIC NEUTRINOS
MUON NEUTRINOS
MUONS
PEV RANGE
POINT SOURCES
TEV RANGE