Probing Galactic Diffuse TeV Gamma-Ray Emission with the HAWC Observatory

Zhou, H.; Rho, Chang Dong; Vianello, G.

doi:10.22323/1.301.0689

Cited by 11 publications

(16 citation statements)

References 10 publications

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“…Recently we gathered the first measurements of diffuse emission in the energy range from hundreds of GeV to several tens of TeV in different regions of the Galactic disk thanks to Milagro [233], H.E.S.S. [30], ARGO-YBJ [234], and HAWC [235]. In this energy range the key challenge, beside separating diffuse gamma-ray emission from the charged-particle background, is to disentangle the interstellar component from the contributions from unresolved source populations.…”

Section: Cosmic-ray Distributions Through the Disks Of Galaxies 411 T...mentioning

confidence: 99%

Gamma Rays as Probes of Cosmic-Ray Propagation and Interactions in Galaxies

2021

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Continuum gamma-ray emission produced by interactions of cosmic rays with interstellar matter and radiation fields is a probe of non-thermal particle populations in galaxies. After decades of continuous improvements in experimental techniques and an ever-increasing sky and energy coverage, gamma-ray observations reveal in unprecedented detail the properties of galactic cosmic rays. A variety of scales and environments are now accessible to us, from the local interstellar medium near the Sun and the vicinity of cosmic-ray accelerators, out to the Milky Way at large and beyond, with a growing number of gamma-ray emitting star-forming galaxies. Gamma-ray observations have been pushing forward our understanding of the life cycle of cosmic rays in galaxies and, combined with advances in related domains, they have been challenging standard assumptions in the field and have spurred new developments in modelling approaches and data analysis methods. We provide a review of the status of the subject and discuss perspectives on future progress.

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Section: Cosmic-ray Distributions Through the Disks Of Galaxies 411 T...mentioning

confidence: 99%

Gamma Rays as Probes of Cosmic-Ray Propagation and Interactions in Galaxies

2021

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“…Previous studies have been performed using the HAWC observatory to set limits on the DGRB [5][6][7]. In this work, the DGRB region of interest is a strip centered on the Crab nebula's location.…”

Section: Discussionmentioning

confidence: 99%

Limits on Diffuse Dark Matter with HAWC

Durocher¹,

Abeysekara²,

Albert³

et al. 2021

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

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In addition to dense regions of dark matter, such as galaxy clusters and dwarf galaxies, dark matter annihilation and decay are also expected to have a nearly isotropic distribution across the sky. This isotropic component is less model-dependent than the flux from isolated dark matter targets, and would produce galactic contributions to the Diffuse Gamma-Ray Background (DGRB). With its continuous monitoring of the gamma-ray sky from a few hundred GeV to several hundred TeV and its wide field-of-view, the High Altitude Water Cherenkov (HAWC) observatory is well-suited to search for dark matter contributions in the DGRB. In this work, 535 days of HAWC data and Monte Carlo simulations were studied to set limits on annihilating or decaying diffuse dark matter at TeV energies. With this data, we consider both leptonic and hadronic dark matter channels and are able to constrain dark matter up to masses >100 TeV.

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“…The simple Gaussian method is already being used for multi-source fits and an example of this in a confused region has been presented. Also, preliminary diffuse flux measurements such as longitudinal and latitudinal profiles are under study [5]. The template method, on the other hand, is expected to allow existing Galactic diffuse templates, based on cosmic-ray calculations from GALPROP / DRAGON, to produce maximum likelihood fits to the data with 3ML [15].…”

Section: Discussionmentioning

confidence: 99%

“…Since the definition of diffuse emission requires measurement of flux not attributable to known TeV γ-ray sources, the analysis of the diffuse flux using data from HAWC can be achieved using two different methods: assessment of residual flux after subtracting all the known TeV γ-ray sources [5]; or, simultaneously fitting the diffuse emission and the known TeV sources in the region of interest based on an estimated diffuse model. The latter is discussed in this paper.…”

Section: Simple Gaussian Modelmentioning

confidence: 99%

Techniques for Measuring Galactic Diffuse Emission Flux and their Preliminary Results in Confused Regions

Rho¹,

Solares²,

Zhou³

2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

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For the HAWC CollaborationFor a complete author list, see www.hawc-observatory.org/collaboration/icrc2017.php.Galactic diffuse emission has provided us with evidence for cosmic ray acceleration throughout the Galaxy and the background for searches for physics beyond the Standard Model. However, only the very limited measurements of the diffuse flux are available in TeV γ rays. The High Altitude Water Cherenkov (HAWC) Observatory is well-suited for observing the diffuse emission of very high energy with its unbiased, wide field of view (2 sr). Using data from HAWC, we present techniques for measuring the diffuse flux and show preliminary results.

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Probing Galactic Diffuse TeV Gamma-Ray Emission with the HAWC Observatory

Cited by 11 publications

References 10 publications

Gamma Rays as Probes of Cosmic-Ray Propagation and Interactions in Galaxies

Gamma Rays as Probes of Cosmic-Ray Propagation and Interactions in Galaxies

Limits on Diffuse Dark Matter with HAWC

Techniques for Measuring Galactic Diffuse Emission Flux and their Preliminary Results in Confused Regions

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