An astrophysically motivated ranking criterion for low-latency electromagnetic follow-up of gravitational wave events

M. Celeste Artale, Yann Bouffanais, Michela Mapelli, Nicola Giacobbo, Nadeen B. Sabha, Filippo Santoliquido, Mario Pasquato, Mario Spera

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We investigate the properties of the host galaxies of compact binary mergers across cosmic time. To this end, we combine population synthesis simulations together with galaxy catalogues from the hydrodynamical cosmological simulation EAGLE to derive the properties of the host galaxies of binary neutron star (BNS), black hole-neutron star (BHNS), and binary black hole (BBH) mergers. Within this framework, we derive the host galaxy probability, i.e. the probability that a galaxy hosts a compact binary coalescence as a function of its stellar mass, star formation rate, Ks magnitude, and B magnitude. This quantity is particularly important for low-latency searches of gravitational wave (GW) sources as it provides a way to rank galaxies lying inside the credible region in the sky of a given GW detection, hence reducing the number of viable host candidates. Furthermore, even if no electromagnetic counterpart is detected, the proposed ranking criterion can still be used to classify the galaxies contained in the error box. Our results show that massive galaxies (or equivalently galaxies with a high luminosity in Ks band) have a higher probability of hosting BNS, BHNS, and BBH mergers. We provide the probabilities in a suitable format to be implemented in future low-latency searches.

    Original languageEnglish (US)
    Pages (from-to)1841-1852
    Number of pages12
    JournalMonthly Notices of the Royal Astronomical Society
    Volume495
    Issue number2
    DOIs
    StatePublished - Jun 1 2020

    Keywords

    • Black hole physics
    • Gravitational waves
    • Methods: numerical
    • Stars: mass-loss
    • Stars: neutron

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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