Axions in Andromeda: Searching for minicluster-neutron star encounters with the Green Bank Telescope

Walters, Liam; Shroyer, Jordan E.; Edenton, Madeleine; Agrawal, Prakamya; Johnson, Bradley; Kavanagh, Bradley J.; Marsh, David J.E.; Visinelli, Luca

doi:10.1103/PhysRevD.110.123002

Axions in Andromeda: Searching for minicluster-neutron star encounters with the Green Bank Telescope

Jul 17, 2024

19 pages

Published in:

Phys.Rev.D 110 (2024) 12, 123002

Published: Dec 2, 2024

e-Print:

2407.13060 [astro-ph.CO]

DOI:

10.1103/PhysRevD.110.123002 (publication)

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Abstract: (APS)

The QCD axion and axionlike particles are compelling candidates for galactic dark matter. Theoretically, axions can convert into photons in the presence of a strong external magnetic field, which means it is possible to search for them experimentally. One approach is to use radio telescopes with high-resolution spectrometers to look for axion-photon conversion in the magnetospheres of neutron stars. In this paper, we describe the results obtained using a novel approach where we used the Green Bank Telescope (GBT) to search for radio transients produced by collisions between neutron stars and dark matter clumps known as axion miniclusters. We used the versatile GBT astronomical spectrometer and the X-band receiver (8–10 GHz) to observe the core of Andromeda. Our measurements are sensitive to axions with masses between 33 and

42 μ eV

with

Δ m_{a} = 3.8 \times 10^{- 4} μ eV

. This paper gives a description of the search method we developed, including observation and analysis strategies. Given our analysis algorithm choices and the instrument sensitivity (

\sim 2 mJy

in each spectral channel), we did not find any candidate signals greater than

5 σ

. We are currently implementing this search method in other spectral bands.

Note:

19 pages, 12 figures, accepted to PRD

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