Search for nonvirialized axions with 3.3 − 4.2 μ ⁢eV mass at selected resolving powers

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. Here, we report an exclusion on the local axion dark matter density in narrow flows of ρ_a ≳ 0.03 GeV/cm³ and ρ_a ≳ 0.004 GeV/cm³ for Dine-Fischler-Srednicki-Zhitnitski and Kim-Shifman-Vainshtein-Zakharov axion-photon couplings, respectively, over the mass range 3.3−4.2 μeV. Measurements were made at selected resolving powers to allow for a range of possible velocity dispersions.. Authors: Hipp, A. T. [University of Florida] (ORCID:0000000152791797); Quiskamp, A. [University of Western Australia]; Caligiure, T. J. [University of Florida] (ORCID:0009000693485239); Gleason, J. R. [University of Florida]; Han, Y. [University of Florida] (ORCID:0000000190940933). DOE Contract: AC02-07CH11359; AC52-07NA27344; FG02-96ER40956; FG02-97ER41029; SC0009723; SC0009800; SC0010280; SC0010296; SC0011665; SC0017987; SC0022148. Subjects: Axions; Dark matter; Dark matter detectors; Microwave techniques; Particle dark matter