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Search for non-virialized axions with 3.3-4.2 $\mu$eV mass at selected resolving powers

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arxiv 2410.09203 v2 pith:PCRD7RVO submitted 2024-10-11 astro-ph.CO

classification astro-ph.CO
keywords axiondarkflowsmatteraxionsdensitygtrsimlocal
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abstract

The Axion Dark Matter eXperiment is sensitive to narrow axion flows, given axions compose a fraction of the dark matter with a non-negligible local density. Detecting these low-velocity dispersion flows requires a high spectral resolution and careful attention to the expected signal modulation due to Earth's motion. We report an exclusion on the local axion dark matter density in narrow flows of $\rho_a \gtrsim 0.03\,\mathrm{GeV/cm^3}$ and $\rho_a \gtrsim 0.004\,\mathrm{GeV/cm^3}$ for Dine-Fischler-Srednicki-Zhitnitski and Kim-Shifman-Vainshtein-Zakharov axion-photon couplings, respectively, over the mass range $3.3-4.2\,\mu\text{eV}$. Measurements were made at selected resolving powers to allow for a range of possible velocity dispersions.

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  1. Indirect detection of the QCD axion

    astro-ph.CO 2024-11 unverdicted

    A GBT X-band search for axion minicluster-neutron star radio transients in M31 found no 5-sigma candidates, yielding sensitivity to QCD axions in the 33-42 micro-eV mass range.

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