Journal
ASTROPHYSICAL JOURNAL
Volume 847, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa8b16
Keywords
elementary particles; X-rays: galaxies: clusters; X-rays: individual (NGC1275)
Categories
Funding
- European Research Council starting grant Supersymmetry Breaking in String Theory [307605]
- Royal Society University Research Fellowship
- European Research Council starting grant Supersymmetry Breaking in String Theory [307605]
- Royal Society University Research Fellowship
- European Research Council (ERC) [307605] Funding Source: European Research Council (ERC)
- STFC [ST/L000474/1] Funding Source: UKRI
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Axion-like particles (ALPs) can induce localized oscillatory modulations in the spectra of photon sources passing through astrophysical magnetic fields. Ultra-deep Chandra observations of the Perseus cluster contain over 5 x 10(5) counts from the active galactic nucleus (AGN) of the central cluster galaxy NGC1275 and represent a data set of extraordinary quality for ALP searches. We use this data set to search for X-ray spectral irregularities from the AGN. The absence of irregularities at the O(30%) level allows us to place leading constraints on the ALP-photon mixing parameter g(a gamma gamma) less than or similar to 1.4-4.0 x 10(-12) GeV-1 for m(a) less than or similar to 10(-12) eV, depending on assumptions on the magnetic field realization along the line of sight.
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