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

McDaniel, Alex; Jeltema, T.; Profumo, Stefano

doi:10.1103/physrevd.100.023014

Cited by 21 publications

(13 citation statements)

References 110 publications

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“…The other main physical interpretation is that the signal arises from DM, which is thought to be the dominant component in the outer regions of the galaxy. γ-ray emission from M31's inner galaxy has also been detected, but the exact nature of the emission still remains an open question, as the morphology of the signal doesn't appear to trace regions rich in gas and star formation [32,[41][42][43][44][45][46][47]. On the other hand, the total γ-ray luminosity is found to be in general agreement with the wellknown scaling relationship between the γ-ray luminosity and infrared luminosity (8-1000 µm) for star-forming galaxies [48].…”

Section: Introductionmentioning

confidence: 99%

Dark Matter Interpretation of the Fermi-LAT Observations Toward the Outer Halo of M31

Karwin,

Murgia,

Moskalenko

et al. 2020

Preprint

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An excess γ-ray signal toward the outer halo of M31 has recently been reported. Although other explanations are plausible, the possibility that it arises from dark matter (DM) is valid. In this work we interpret the excess in the framework of DM annihilation, using as our representative case WIMP DM annihilating to bottom quarks, and we perform a detailed study of the systematic uncertainty in the J-factor for the M31 field. We find that the signal favors a DM particle with a mass of ∼46-73 GeV. While the mass is well constrained, the systematic uncertainty in the cross-section spans 2.5 orders of magnitude, ranging from ∼8×10 −27 − 4 × 10 −24 cm 3 s −1 . This high uncertainty is due to two main factors, namely, an uncertainty in the substructure nature and geometry of the DM halos for both M31 and the Milky Way (MW), and correspondingly, an uncertainty in the contribution to the signal from the MW's DM halo along the line of sight. However, under the conditions that the minimum subhalo mass is < ∼ 10 −6 M and the actual contribution from the MW's DM halo along the line of sight is at least ∼30% of its total value, we show that there is a large overlap with the DM interpretations of both the Galactic center (GC) excess and the antiproton excess, while also being compatible with the limits for the MW dwarf spheroidals. More generally, we summarize the results from numerous complementary DM searches in the energy range 10 GeV − 300 GeV corresponding to the GC excess and identify a region in parameter space that still remains viable for discovery of the DM particle.

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Section: Introductionmentioning

confidence: 99%

Dark Matter Interpretation of the Fermi-LAT Observations Toward the Outer Halo of M31

Karwin,

Murgia,

Moskalenko

et al. 2020

Preprint

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“…In this Section we summarize the results of the analysis of Fermi-LAT from the M31 region performed in Karwin et al (2019). We will not discuss here the bright 𝛾-ray emission from the IG, whose origin has been debated in (Ackermann et al 2017;Di Mauro et al 2019;McDaniel et al 2019), nor the tenuous diffuse emission from the OH, whose origin might be unrelated to M31 (Karwin et al 2019), but we will rather focus on the 𝛾-ray emission observed from the SH.…”

Section: Summary Of the Relevant 𝛾-Ray Datamentioning

confidence: 99%

Giant cosmic ray halos around M31 and the Milky Way

Recchia,

Gabici,

Aharonian

et al. 2021

Preprint

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Recently, a diffuse emission of 1-100 GeV 𝛾-rays has been detected from the direction of Andromeda. The emission is centered on the galaxy, and extends for ∼ 100 − 200 kpc away from its center. Explaining the extended 𝛾−ray emission within the framework of standard scenarios for the escape of cosmic rays injected in the galactic disk or in the galactic center is problematic. In this paper, we argue that a cosmic ray origin (either leptonic or hadronic) of the 𝛾-ray emission is possible in the framework of non standard cosmic ray propagation scenarios or in the case of particle acceleration taking place in the galaxy's halo. It would imply the existence of a giant cosmic ray halo surrounding M31, possibly powered by the galaxy nuclear activity, or by accretion of intergalactic gas. Remarkably, if cosmic ray halos, as the one observed around M31, are a common feature of galaxies, including our own, the interactions between cosmic ray protons and the Milky Way circumgalactic gas could also explain the isotropic diffuse flux of neutrinos observed by Icecube.

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“…Ref. [17] points out that the radio and -ray observations of M31 bulge suggest that it hosts an CR electron power of ∼ 10 39 erg s −1 , while SNRs can only inject ∼ 5×10 37 erg s −1 . Interestingly, our model predicts that MSPs can inject ∼ 8 × 10 38 erg s −1 .…”

Section: Takahiro Sudohmentioning

confidence: 99%

Millisecond Pulsars Modify the Radio-SFR Correlation

Sudoh¹,

Linden²,

Beacom³

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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The observed correlation between the far-infrared and radio luminosities of galaxies illustrates the close connection between star formation and cosmic-ray production. Intriguingly, recent LOFAR observations find a peculiar radio excess in galaxies with low star-formation rates and high stellar masses. We show that recycled/millisecond pulsars (MSPs) can dominate the nonthermal emission in these massive quiescent galaxies and explain the excess. This is in line with recent gamma-ray observation suggesting that MSPs may efficiently accelerate cosmic-ray electrons. We find that MSP-based models provide a significantly improved fit to the LOFAR data. We discuss implications for the radio and gamma-ray excesses in M31 and local electron and positron observations.

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

Cited by 21 publications

References 110 publications

Dark Matter Interpretation of the Fermi-LAT Observations Toward the Outer Halo of M31

Dark Matter Interpretation of the Fermi-LAT Observations Toward the Outer Halo of M31

Giant cosmic ray halos around M31 and the Milky Way

Millisecond Pulsars Modify the Radio-SFR Correlation

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