Directional limits on persistent gravitational waves using data from Advanced LIGO's first two observing runs

Abbott, B. P. and Angelova, S. V. and Lockerbie, N. A. and Reid, S., LIGO Scientific Collaboration, Virgo Collaboration (2019) Directional limits on persistent gravitational waves using data from Advanced LIGO's first two observing runs. Physical Review D, 100 (6). 062001. ISSN 1550-2368

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    Abstract

    We perform an unmodeled search for persistent, directional gravitational wave (GW) sources using data from the first and second observing runs of Advanced LIGO. We do not find evidence for any GW signals. We place limits on the broadband GW flux emitted at 25 Hz from point sources with a power law spectrum at Fα,Θ<(0.05-25)×10-8 erg cm-2 s-1 Hz-1 and the (normalized) energy density spectrum in GWs at 25 Hz from extended sources at ωα(Θ)<(0.19-2.89)×10-8 sr-1 where α is the spectral index of the energy density spectrum. These represent improvements of 2.5-3× over previous limits. We also consider point sources emitting GWs at a single frequency, targeting the directions of Sco X-1, SN 1987A, and the Galactic center. The best upper limits on the strain amplitude of a potential source in these three directions range from h0<(3.6-4.7)×10-25, 1.5× better than previous limits set with the same analysis method. We also report on a marginally significant outlier at 36.06 Hz. This outlier is not consistent with a persistent gravitational-wave source as its significance diminishes when combining all of the available data.

    Author(s):Abbott, B. P., Angelova, S. V., Lockerbie, N. A. ORCID logoORCID: https://orcid.org/0000-0002-1678-3260 and Reid, S.
    Item type:Article
    ID code:70338
    Keywords:LIGO, intermediate mass black hole binaries, IMBHBs, gravitational waves, Physics, Astronomy and Astrophysics
    Subjects:Science > Physics
    Department:Faculty of Engineering > Biomedical Engineering
    Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:29 Oct 2019 11:40
    Last modified:17 Jan 2020 23:02
    URI:https://strathprints.strath.ac.uk/id/eprint/70338
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