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Low-latency gravitational wave alert products and their performance at the time of the fourth LIGO-Virgo-KAGRA observing run.
Proc Natl Acad Sci U S A
April 2024
Leonard E. Parker Center for Gravitation, Cosmology, and Astrophysics, University of Wisconsin-Milwaukee, Milwaukee, WI 53201.
Article Synopsis
- Current multimessenger searches for binary neutron star (BNS) and neutron star-black hole (NSBH) mergers are advancing with the gravitational wave observatories ALIGO, AdVirgo, and KAGRA during their fourth observing run (O4).
- To enhance the search, the study utilized simulated binary populations and conducted a mock data challenge (MDC), optimizing the software used for real-time data analysis and alert generation.
- The paper reports on the low-latency infrastructure performance, with a median alert time of approximately 29.5 seconds for full searches, and emphasizes the importance of early warnings for neutron star mergers with a new trigger system, aiming for responses about 3.1 seconds before mergers occur.
Cosmic ray feedback in galaxies and galaxy clusters: A pedagogical introduction and a topical review of the acceleration, transport, observables, and dynamical impact of cosmic rays.
Astron Astrophys Rev
December 2023
Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany.
Understanding the physical mechanisms that control galaxy formation is a fundamental challenge in contemporary astrophysics. Recent advances in the field of astrophysical feedback strongly suggest that cosmic rays (CRs) may be crucially important for our understanding of cosmological galaxy formation and evolution. The appealing features of CRs are their relatively long cooling times and relatively strong dynamical coupling to the gas.
View Article and Find Full Text PDFSearches for beyond-standard-model physics with astroparticle physics instruments.
Philos Trans A Math Phys Eng Sci
February 2024
Department of Physics, University of Wuppertal, Wuppertal 42119, Germany.
Many instruments for astroparticle physics are primarily geared towards multi-messenger astrophysics, to study the origin of cosmic rays and to understand high-energy astrophysical processes. Since these instruments observe the Universe at extreme energies and in kinematic ranges not accessible at accelerators these experiments provide also unique and complementary opportunities to search for particles and physics beyond the standard model of particle physics. In particular, the reach of IceCube, Fermi and KATRIN to search for and constrain Dark Matter, Axions, heavy Big Bang relics, sterile neutrinos and Lorentz invariance violation will be discussed.
View Article and Find Full Text PDFA kilonova following a long-duration gamma-ray burst at 350 Mpc.
Nature
December 2022
Astronomical Institute of the Czech Academy of Sciences (ASU-CAS), Ondřejov, Czech Republic.
Gamma-ray bursts (GRBs) are divided into two populations; long GRBs that derive from the core collapse of massive stars (for example, ref. ) and short GRBs that form in the merger of two compact objects. Although it is common to divide the two populations at a gamma-ray duration of 2 s, classification based on duration does not always map to the progenitor.
View Article and Find Full Text PDFCandidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino.
Phys Rev Lett
June 2022
Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 234 Herzl Street 76100 Rehovot, Israel.
The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one high-energy neutrino was associated with a tidal disruption event (TDE). Here we present AT2019fdr, an exceptionally luminous TDE candidate, coincident with another high-energy neutrino.
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