Cosmic axion background propagation in galaxies
Cosmic axion background propagation in galaxies
复制标题
星系中的宇宙轴子背景传播
DOI:
10.1016/j.physletb.2015.12.058
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发表时间:
2016
影响因子:
4.4
通讯作者:
Day F
中科院分区:
文献类型:
--
作者:
Day F
Many extensions of the Standard Model include axions or axion-like particles (ALPs). Here we study ALP to photon conversion in the magnetic field of the Milky Way and starburst galaxies. By modelling the effects of the coherent and random magnetic fields, the warm ionized medium and the warm neutral medium on the conversion process, we simulate maps of the conversion probability across the sky for a range of ALP energies. In particular, we consider a diffuse cosmic ALP background (CAB) analogous to the CMB, whose existence is suggested by string models of inflation. ALP–photon conversion of a CAB in the magnetic fields of galaxy clusters has been proposed as an explanation of the cluster soft X-ray excess. We therefore study the phenomenology and expected photon signal of CAB propagation in the Milky Way. We find that, for the CAB parameters required to explain the cluster soft X-ray excess, the photon flux from ALP–photon conversion in the Milky Way would be unobservably small. The ALP–photon conversion probability in galaxy clusters is 3 orders of magnitude higher than that in the Milky Way. Furthermore, the morphology of the unresolved cosmic X-ray background is incompatible with a significant component from ALP–photon conversion. We also consider ALP–photon conversion in starburst galaxies, which host much higher magnetic fields. By considering the clumpy structure of the galactic plasma, we find that conversion probabilities comparable to those in clusters may be possible in starburst galaxies.
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影响因子:
8.6
作者:
Joseph P. Conlon;M. C. D. Marsh
通讯作者:
M. C. D. Marsh
影响因子:
6.5
作者:
A. Misiriotis;E. Xilouris;J. Papamastorakis;P. Boumis;C. Goudis
通讯作者:
A. Misiriotis;E. Xilouris;J. Papamastorakis;P. Boumis;C. Goudis
影响因子:
8.6
作者:
J. Grífols;E. Massó;R. Toldrà
通讯作者:
R. Toldrà
影响因子:
4.4
作者:
Brockway, JW;Carlson, ED;Raffelt, GG
通讯作者:
Raffelt, GG
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
J. Conlon;M. C. Marsh
通讯作者:
M. C. Marsh