1,605 research outputs found

    Sensitivity of full-sky experiments to large scale cosmic ray anisotropies

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    The two main advantages of space-based observation of extreme energy (≳5×1019\gtrsim5\times10^{19} eV) cosmic rays (EECRs) over ground based observatories are the increased field of view and the full-sky coverage with nearly uniform systematics across the entire sky. The former guarantees increased statistics, whereas the latter enables a clean partitioning of the sky into spherical harmonics. The discovery of anisotropies would help to identify the long sought origin of EECRs. We begin an investigation of the reach of a full-sky space-based experiment such as EUSO to detect anisotropies in the extreme-energy cosmic-ray sky compared to ground based partial-sky experiments such as the Pierre Auger Observatory and Telescope Array. The technique is explained here, and simulations for a Universe with just two nonzero multipoles, monopole plus either dipole or quadrupole, are presented. These simulations quantify the advantages of space-based, all-sky coverage.Comment: 11 pages, 8 figure

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    The Galactic Contribution to IceCube's Astrophysical Neutrino Flux

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    High energy neutrinos have been detected by IceCube, but their origin remains a mystery. Determining the sources of this flux is a crucial first step towards multi-messenger studies. In this work we systematically compare two classes of sources with the data: Galactic and extragalactic. We assume that the neutrino sources are distributed according to a class of Galactic models. We build a likelihood function on an event by event basis including energy, event topology, absorption, and direction information. We present the probability that each high energy event with deposited energy Edep>60E_{\rm dep}>60 TeV in the HESE sample is Galactic, extragalactic, or background. For Galactic models considered the Galactic fraction of the astrophysical flux has a best fit value of 1.3%1.3\% and is <9.5%<9.5\% at 90\% CL. A zero Galactic flux is allowed at <1σ<1\sigma.Comment: Updated with 6 year HESE data from IceCube, accepted for publication in JCA

    Swift UVOT Observations of Core-Collapse SNe

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    We review recent UV observations of core-collapse supernovae (SNe) with the Swift Ultra-violet/Optical Telescope (UVOT) during its first two years. Rest-frame UV photometry is useful for differentiating SN types by exploiting the UV-optical spectral shape and more subtle UV features. This is useful for the real-time classification of local and high-redshift SNe using only photometry. Two remarkable SNe Ib/c were observed with UVOT -- SN2006jc was a UV bright SN Ib. Swift observations of GRB060218/SN2006aj began shortly after the explosion and show a UV-bright peak followed by a UV-faint SN bump. UV observations are also useful for constraining the temperature and ionization structure of SNe IIP. Rest-frame UV observations of all types are important for understanding the extinction, temperature, and bolometric luminosity of SNe and to interpret the observations of high redshift SNe observed at optical wavelengths.Comment: Figures are enlarged and colorized from print versio

    Sensitivity of orbiting JEM-EUSO to large-scale cosmic-ray anisotropies

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    The two main advantages of space-based observation of extreme-energy (≳1019\gtrsim 10^{19}~eV) cosmic-rays (EECRs) over ground-based observatories are the increased field of view, and the all-sky coverage with nearly uniform systematics of an orbiting observatory. The former guarantees increased statistics, whereas the latter enables a partitioning of the sky into spherical harmonics. We have begun an investigation, using the spherical harmonic technique, of the reach of \J\ into potential anisotropies in the extreme-energy cosmic-ray sky-map. The technique is explained here, and simulations are presented. The discovery of anisotropies would help to identify the long-sought origin of EECRs.Comment: 7 pages, 6 figures. To appear in the proceedings of the Cosmic Ray Anisotropy Workshop, Madison Wisconsin, September 201

    Solving the Engineering Technology Center Printer Crisis through Process Improvement by using Six Sigma DMAIC Method

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    Faculty and students alike at Kennesaw State University know the pain of needing to print an assignment, class roster, or other items, only for the print job to fail due to a lack of paper. When one attempts to notify someone of the issue, either there is no success of finding someone who can lead them to the correct contact, or if they do reach the correct department, lead times are long and they are forced to find another source to print their items anyway. Specifically in the Engineering Technology Center, also known as the Q-Building, where there are only two printers available, there is a high probability that at least one of the printers may be in use or be short of supply on paper. Kennesaw State University as a whole is affected by this issue due to a decrease in profitability, lack of satisfaction of students, and through the frustration of staff. As CAPE Logistics, we aim to provide a conflict free printing environment that is available when and where printing is needed at all times for everyone looking to print items on any of the provided paper sizes in the Engineering Technology Center
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