Searching for the possible signal of the photon-axionlike particle oscillation in the combined GeV and TeV spectra of supernova remnants. (arXiv:1911.08096v1 [astro-ph.HE])

Searching for the possible signal of the photon-axionlike particle oscillation in the combined GeV and TeV spectra of supernova remnants. (arXiv:1911.08096v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Xia_Z/0/1/0/all/0/1">Zi-Qing Xia</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liang_Y/0/1/0/all/0/1">Yun-Feng Liang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Feng_L/0/1/0/all/0/1">Lei Feng</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yuan_Q/0/1/0/all/0/1">Qiang Yuan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fan_Y/0/1/0/all/0/1">Yi-Zhong Fan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wu_J/0/1/0/all/0/1">Jian Wu</a>

The conversion between photons and axionlike particles (ALPs) in the Milky
Way magnetic field could result in the detectable oscillation phenomena in
$gamma$-ray spectra of Galactic sources. In this work, the GeV (Fermi-LAT) and
TeV (MAGIC/VERITAS/H.E.S.S.) data of three bright supernova remnants (SNRs, ie.
IC443, W51C and W49B) have been adopted together to search such the oscillation
effect. Different from our previous analysis of the sole Fermi-LAT data of
IC443, we do not find any reliable signal for the photon-ALP oscillation in the
joint broadband spectrum of each SNR. The reason for the inconsistence is that
in this work we use the latest revision (P8R3) of Fermi-LAT data, updated
diffuse emission templates and the new version of the source catalog (4FGL),
which lead to some modification of the GeV spectrum of IC443. Then we set
constraints on ALP parameters based on the combined analysis of all the three
sources. Though these constraints are somewhat weaker than limits from the CAST
experiment and globular clusters, they are supportive of and complementary to
these other results.

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