Multi-Messenger Windows on the Universe: detecting precursor emission to compacts' mergers
arxiv(2024)
Abstract
We provide an overview of various mechanisms, and corresponding powers, of
precursor emission to compacts' mergers to be detected by LIGO-Virgo-KAGRA
(LVK) collaboration. Expected peak powers, ≤ 10^43 erg s^-1, are not
sufficiently high to be detected by all-sky high-energy satellites (unless
beamed). The best chance is the detection of possible coherent radio emission,
producing observable signals up to ∼ Jansky of flux density. Low-frequency
phased array telescopes like LOFAR, the MWA and DSA-2000 are best suited due to
their large instantaneous sky coverage. Time-wise, in addition to LIGO early
warning alerts up to a minute before the merger, the dispersive delay at lower
frequencies of ∼ 300 MHz can be of the order of minutes. Optical
detections are the most challenging.
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