On the Evidence for Axion-like Particles from Active Galactic Nuclei

Details On the Evidence for Axion-like Particles from Active Galactic Nuclei On the Evidence for Axion-like Particles from Active Galactic Nuclei

2010-06-30

arxiv.org/abs/1007.0024v2

Phys. Rev. D 82, 083502 (2010)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages, 12 figures. Updated to reflect the minor changes introduced in the published version

Scientific paper

10.1103/PhysRevD.82.083502

Burrage, Davis, and Shaw recently suggested exploiting the correlations between high and low energy luminosities of astrophysical objects to probe possible mixing between photons and axion-like particles (ALP) in magnetic field regions. They also presented evidence for the existence of ALP's by analyzing the optical/UV and X-ray monochromatic luminosities of AGNs. We extend their work by using the monochromatic luminosities of 320 unobscured Active Galactic Nuclei from the Sloan Digital Sky Survey/Xmm-Newton Quasar Survey (Young et al., 2009), which allows the exploration of 18 different combinations of optical/UV and X-ray monochromatic luminosities. However, we do not find compelling evidence for the existence of ALPs. Moreover, it appears that the signal reported by Burrage et al. is more likely due to X-ray absorption rather than to photon-ALP oscillation.

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