24 research outputs found

    The IceCube Neutrino Observatory - Contributions to ICRC 2017 Part VI: IceCube-Gen2, the Next Generation Neutrino Observatory

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    Papers on research & development towards IceCube-Gen2, the next generation neutrino observatory at South Pole, submitted to the 35th International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by the IceCube-Gen2 Collaboration

    Search for transient optical counterparts to high-energy IceCube neutrinos with Pan-STARRS1

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    In order to identify the sources of the observed diffuse high-energy neutrino flux, it is crucial to discover their electromagnetic counterparts. To increase the sensitivity of detecting counterparts of transient or variable sources by telescopes with a limited field of view, IceCube began releasing alerts for single high-energy (E-v > 60 TeV) neutrino detections with sky localisation regions of order 1 degrees radius in 2016. We used Pan-STARRS1 to follow-up five of these alerts during 2016-2017 to search for any optical transients that may be related to the neutrinos. Typically 10-20 faint m(ip1) less than or similar to 22.5 mag) extragalactic transients are found within the Pan-STARRS1 footprints and are generally consistent with being unrelated field supernovae (SNe) and AGN. We looked for unusual properties of the detected transients, such as temporal coincidence of explosion epoch with the IceCube timestamp, or other peculiar light curve and physical properties. We found only one transient that had properties worthy of a specific follow-up. In the Pan-STARRS1 imaging for IceCube-160427A (probability to be of astrophysical origin of similar to 50%), we found a SN PS16cgx, located at 10.0' from the nominal IceCube direction. Spectroscopic observations of PS16cgx showed that it was an H-poor SN at redshift z = 0.2895 +/- 0.0001. The spectra and light curve resemble some high-energy Type Ic SNe, raising the possibility of a jet driven SN with an explosion epoch temporally coincident with the neutrino detection. However, distinguishing Type Ia and Type Ic SNe at this redshift is notoriously difficult. Based on all available data we conclude that the transient is more likely to be a Type Ia with relatively weak Sin absorption and a fairly normal rest-frame r-band light curve. If, as predicted, there is no high-energy neutrino emission from Type Ia SNe, then PS16cgx must be a random coincidence, and unrelated to the IceCube-160427A. We find no other plausible optical transient for any of the five IceCube events observed down to a 5 sigma limiting magnitude of mip1 approximate to 22 mag, between 1 day and 25 days after detection

    Dataset for "Winter thermal comfort and health in the elderly"

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    The data within this dataset was collected from 43 homes, all in Bath, UK, with at least one occupant aged 65 or over. Sensors were placed in the living rooms and bedrooms of the participating homes to measure temperature at 90-minute intervals throughout the phases of the project. There were four phases in total: November 2016 – March 2017; June 2017 – September 2017; November 2017 – March 2018; June 2018 – September 2018. Corresponding questionnaires were completed on a monthly basis throughout the phases of the project, gathering data about thermal comfort and health. Within this dataset the measured internal temperatures, participant self-reported thermal comfort and health problems are contained in either Excel or CSV files

    Dataset for "Winter thermal comfort and health in the elderly"

    No full text
    The data within this dataset was collected from 43 homes, all in Bath, UK, with at least one occupant aged 65 or over. Sensors were placed in the living rooms and bedrooms of the participating homes to measure temperature at 90-minute intervals throughout the phases of the project. There were four phases in total: November 2016 – March 2017; June 2017 – September 2017; November 2017 – March 2018; June 2018 – September 2018. Corresponding questionnaires were completed on a monthly basis throughout the phases of the project, gathering data about thermal comfort and health. Within this dataset the measured internal temperatures, participant self-reported thermal comfort and health problems are contained in either Excel or CSV files

    A Search for Neutrino Emission from Fast Radio Bursts with Six Years of IceCube Data

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    We present a search for coincidence between IceCube TeV neutrinos and fast radio bursts (FRBs). During the search period from 2010 May 31 to 2016 May 12, a total of 29 FRBs with 13 unique locations have been detected in the whole sky. An unbinned maximum likelihood method was used to search for spatial and temporal coincidence between neutrinos and FRBs in expanding time windows, in both the northern and southern hemispheres. No significant correlation was found in six years of IceCube data. Therefore, we set upper limits on neutrino fluence emitted by FRBs as a function of time window duration. We set the most stringent limit obtained to date on neutrino fluence from FRBs with an E−2E^{-2} energy spectrum assumed, which is 0.0021 GeV cm−2^{-2} per burst for emission timescales up to \textasciitilde102^2 seconds from the northern hemisphere stacking search

    Constraints on Galactic Neutrino Emission with Seven Years of IceCube Data

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    The origins of high-energy astrophysical neutrinos remain a mystery despite extensive searches for their sources. We present constraints from seven years of IceCube Neutrino Observatory muon data on the neutrino flux coming from the Galactic plane. This flux is expected from cosmic-ray interactions with the interstellar medium or near localized sources. Two methods were developed to test for a spatially extended flux from the entire plane, both of which are maximum likelihood fits but with different signal and background modeling techniques. We consider three templates for Galactic neutrino emission based primarily on gamma-ray observations and models that cover a wide range of possibilities. Based on these templates and in the benchmark case of an unbroken E -2.5 power-law energy spectrum, we set 90% confidence level upper limits, constraining the possible Galactic contribution to the diffuse neutrino flux to be relatively small, less than 14% of the flux reported in Aartsen et al. above 1 TeV. A stacking method is also used to test catalogs of known high-energy Galactic gamma-ray sources

    The IceCube Neutrino Observatory - Contributions to ICRC 2017 Part V: Solar flares, Supernovae, Event reconstruction, Education & Outreach

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    Papers on solar flares, supernovae, event reconstruction and education & outreach, submitted to the 35th International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by the IceCube Collaboratio

    The IceCube Neutrino Observatory - Contributions to ICRC 2017 Part IV: Searches for Beyond the Standard Model Physics

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    Papers on searches for beyond the standard model physics, submitted to the 35th International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by the IceCube Collaboratio

    The IceCube Neutrino Observatory - Contributions to ICRC 2017 Part III: Cosmic Rays

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    Papers on cosmic-ray measurements submitted to the 35th International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by the IceCube Collaboratio
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