Exploring a cosmic-ray origin of the multiwavelength emission in M31

McDaniel, Alex; Jeltema, Tesla; Profumo, Stefano

doi:10.1103/physrevd.100.023014

Title: Exploring a cosmic-ray origin of the multiwavelength emission in M31

Journal Article · Fri Jul 26 00:00:00 EDT 2019 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.100.023014· OSTI ID:1611354

McDaniel, Alex ^[1]; Jeltema, Tesla ^[1]; Profumo, Stefano ^[1]

Univ. of California, Santa Cruz, CA (United States); Santa Cruz Inst. for Particle Physics, CA (United States)

A recent detection of spatially extended gamma-ray emission in the central region of the Andromeda galaxy (M31) has led to several possible explanations being put forth, including dark matter annihilation and millisecond pulsars. Another possibility is that the emission in M31 can be accounted for with a purely astrophysical cosmic-ray (CR) scenario. This scenario would lead to a rich multiwavelength emission that can, in turn, be used to test it. Relativistic cosmic-ray electrons (CRe) in magnetic fields produce radio emission through synchrotron radiation, while x-rays and gamma rays are produced through inverse Compton scattering. Additionally, collisions of primary cosmic-ray protons (CRp) in the interstellar medium produce charged and neutral pions that then decay into secondary CRe (detectable through radiative processes) and gamma rays. Here, we explore the viability of a CR origin for multiwavelength emission in M31, taking into consideration three scenarios: a CR scenario dominated by primary CRe, one dominated by CRp and the resulting secondary CRe and gamma rays from neutral pion decay, and a final case in which both of these components exist simultaneously. Here, we find that the multicomponent model is the most promising, and is able to fit the multiwavelength spectrum for a variety of astrophysical parameters consistent with previous studies of M31 and of cosmic-ray physics. However, the CR power injection implied by our models exceeds the estimated CR power injection from typical astrophysical cosmic-ray sources such as supernovae.

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Research Organization:: Univ. of California, Santa Cruz, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0010107; 1517545

OSTI ID:: 1611354

Alternate ID(s):: OSTI ID: 1545435

Journal Information:: Physical Review. D., Vol. 100, Issue 2; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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XMM-Newton RGS Spectroscopy of the M31 Bulge. I. Evidence for a Past AGN Half a Million Years Ago Zhang, Shuinai; Wang, Q. Daniel; Foster, Adam R. The Astrophysical Journal, Vol. 885, Issue 2 https://doi.org/10.3847/1538-4357/ab4a0f	journal	November 2019

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