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Galaxies, Volume 10, Issue 5

October 2022 - 12 articles

Cover Story: Neutron stars are known to withstand very fast rotation. The current record holders, for example, rotate around their axis of rotation more than 700 times per second. At such high rotational frequencies, neutron stars are no longer spherically symmetric objects but may build up mass multipole moments, causing them to begin emitting gravitational waves via the onset of gravitational–radiation reaction (GRR)-driven instabilities. We have calculated the rotational periods at which this happens. They depend on the temperature and mass of a neutron star and are found to be reached before mass shedding from the equator makes the star unstable. This makes neutron stars interesting candidates in the search for sources of gravitational waves. View this paper

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Review

45 Citations

7,083 Views

38 Pages

The Structure of Gamma Ray Burst Jets

Om Sharan Salafia and
Giancarlo Ghirlanda

Galaxies2022, 10(5), 93;https://doi.org/10.3390/galaxies10050093

30 August 2022

Due to relativistic bulk motion, the structure and orientation of gamma-ray burst (GRB) jets have a fundamental role in determining how they appear. The recent discovery of the GW170817 binary neutron star merger and the associated GRB boosted the in...

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Review

12 Citations

5,118 Views

29 Pages

TeV Dark Matter Searches in the Extragalactic Gamma-ray Sky

Moritz Hütten and
Daniel Kerszberg

Galaxies2022, 10(5), 92;https://doi.org/10.3390/galaxies10050092

29 August 2022

High-energetic gamma rays from astrophysical targets constitute a unique probe for annihilation or decay of heavy particle dark matter (DM). After several decades, diverse null detections have resulted in strong constraints for DM particle masses up...

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Galaxies - ISSN 2075-4434

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