Cosmic Gamma-Ray Background From Star-Forming Galaxies

Fields, Brian D.; Pavlidou, V.; Prodanovic, Tijana

doi:10.1088/2041-8205/722/2/l199

Cited by 101 publications

(185 citation statements)

References 44 publications

(51 reference statements)

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“…The expected fluxes for the other sources in the sample are below the sensitivity of Fermi/LAT, even after ten years of observation. This is consistent with the work of Fields et al (2010), who estimate that there are around five normal galaxies that are individually detectable with Fermi/LAT. A contribution from the collective emission of compact objects in the host galaxies is found to be negligible compared to such expected emission.…”

Section: Discussionsupporting

confidence: 93%

“…Normal and Seyfert galaxies have been thought to contribute to a small amount of the extragalactic diffuse γ-ray emission (See e.g., Strong et al 1976). However, recent studies have shown that their contribution can in fact be dominant compared to the one from blazars (see e.g., Fields et al 2010). We present here a study of the search for high-energy γ-ray emission from the major galaxies pertaining to the Local Group.…”

Section: Introductionmentioning

confidence: 99%

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Search for high-energyγ-ray emission from galaxies of the Local Group withFermi/LAT

Lenain

Walter

2011

A&A

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Context. With the discovery of high-energy γ-ray emission from the Andromeda galaxy (M 31) by the Fermi/LAT collaboration, normal galaxies begin to arise from the shadows for the first time, providing insight into cosmic ray acceleration in external galaxies. Aims. We search for high-energy γ-ray emission from those galaxies in the Local Group that have so far not been investigated: M 81, M 83, IC 342, Maffei 1, Maffei 2, and M 94. Methods. Fermi/LAT public data from August 4, 2008 to January 1, 2011 were analysed for these galaxies. We compared the results to other starburst and normal galaxies detected so far at high energies: the Magellanic clouds, M 31, and the starburst galaxies M 82 and NGC 253. Results. No significant detection is found in the data for the sources in our sample, and we derive upper limits on their photon flux. After comparing the results to other Local Group objects, we find that the derived upper limits are fully compatible with expectations from cosmic rays interacting with the interstellar medium within the host galaxies. In the case of M 33 and M 83, a detection in Fermi/LAT data should be imminent. The expected fluxes for the other sources in the sample are below the sensitivity of Fermi/LAT, even after 10 years of observation. Collective emission from compact objects in the host galaxies is also found to be negligible compared to the expected emission from cosmic ray interactions.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Search for high-energyγ-ray emission from galaxies of the Local Group withFermi/LAT

Lenain

Walter

2011

A&A

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“…Over the energy range 200 MeV -100 GeV, the spectrum of the isotropic emission is a power law that scales scales as E −2.4 (Abdo et al, 2010d). Though the above sources are expected to contribute to this emission, there is no well-accepted model for the relative contributions of each of the sources (Fields et al, 2010;Inoue, 2011). Similar to the case of Galactic emission, since the energy spectrum is a pure power law, it is clear that dark matter annihilation does not explain it over a large range of energies.…”

Section: Diffuse Galactic and Extragalactic Searchesmentioning

confidence: 99%

Galactic searches for dark matter

2013

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For nearly a century, more mass has been measured in galaxies than is contained in the luminous stars and gas. Through continual advances in observations and theory, it has become clear that the dark matter in galaxies is not comprised of known astronomical objects or baryonic matter, and that identification of it is certain to reveal a profound connection between astrophysics, cosmology, and fundamental physics. The best explanation for dark matter is that it is in the form of a yet undiscovered particle of nature, with experiments now gaining sensitivity to the most well-motivated particle dark matter candidates. In this article, I review measurements of dark matter in the Milky Way and its satellite galaxies and the status of Galactic searches for particle dark matter using a combination of terrestrial and space-based astroparticle detectors, and large scale astronomical surveys. I review the limits on the dark matter annihilation and scattering cross sections that can be extracted from both astroparticle experiments and astronomical observations, and explore the theoretical implications of these limits. I discuss methods to measure the properties of particle dark matter using future experiments, and conclude by highlighting the exciting potential for dark matter searches during the next decade, and beyond.

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“…Other possible source populations for the EGB include starforming galaxies, which have been proposed as a possible significant contributor to the EGB by, e.g., Stecker & Venters (2011), Fields et al (2010, and Lacki et al (2011), although this is countered by Makiya et al (2011), radio galaxies (e.g., Inoue 2011), and non-blazar AGNs (e.g., Inoue & Totani 2009, 2011.…”

Section: And One Is Left Withmentioning

confidence: 99%

Gamma-Ray Luminosity and Photon Index Evolution of FSRQ Blazars and Contribution to the Gamma-Ray Background

Singal

Petrosian

2014

ApJ

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We present the redshift evolutions and distributions of the gamma-ray luminosity and photon spectral index of flat spectrum radio quasar (FSRQ) type blazars, using non-parametric methods to obtain the evolutions and distributions directly from the data. The sample we use for analysis consists of almost all FSRQs observed with a greater than approximately 7σ detection threshold in the first-year catalog of the Fermi Gamma-ray Space Telescope's Large Area Telescope, with redshifts as determined from optical spectroscopy by Shaw et al. We find that FSQRs undergo rapid gamma-ray luminosity evolution, but negligible photon index evolution, with redshift. With these evolutions accounted for we determine the density evolution and luminosity function of FSRQs and calculate their total contribution to the extragalactic gamma-ray background radiation, resolved and unresolved, which is found to be 16(+10/−4)%, in agreement with previous studies.

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Cosmic Gamma-Ray Background From Star-Forming Galaxies

Cited by 101 publications

References 44 publications

Search for high-energyγ-ray emission from galaxies of the Local Group withFermi/LAT

Search for high-energyγ-ray emission from galaxies of the Local Group withFermi/LAT

Galactic searches for dark matter

Gamma-Ray Luminosity and Photon Index Evolution of FSRQ Blazars and Contribution to the Gamma-Ray Background

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