Analyzing the gamma-ray sky with wavelets
Abstract
We analyze the gamma-ray sky at energies of 0.5 to 50 GeV using the undecimated wavelet transform on the sphere. Focusing on the inner 60°×60° of the sky, we identify and characterize four separate residuals beyond the expected Milky Way diffuse emission. We detect the Fermi bubbles, finding compelling evidence that they are diffuse in nature and contain very little small-scale structure. We detect the “cocoon” inside the southern bubble, and we also identify its northern counterpart above 2 GeV. The northern cocoon lies along the same axis but is ~30% dimmer than the southern one. We characterize the Galactic center excess, which we find extends up to 20° in |b|. At latitudes |b|≤5° we find evidence for power in small angular scales that could be the result of point-source contributions, but for |b|≥5° the Galactic center excess is dominantly diffuse in its nature. Our findings show either that the Galactic center excess and Fermi bubbles connect smoothly or that the bubbles brighten significantly below 15° in latitude. We find that the Galactic center excess appears off-center toward negative ℓ. Additionally, we find and characterize two emissions along the Galactic disk centered at ℓ≃+25° and -20°. Furthermore, these emissions are significantly more elongatedmore »
- Authors:
-
- The Johns Hopkins Univ., Baltimore, MD (United States)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1436722
- Alternate Identifier(s):
- OSTI ID: 1463937
- Report Number(s):
- arXiv:1803.01952; FERMILAB-PUB-18-057-A-T
Journal ID: ISSN 2470-0010; PRVDAQ; 1658780; TRN: US1900226
- Grant/Contract Number:
- AC02-07CH11359; SC0007859
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 4; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Balaji, Bhaskaran, Cholis, Ilias, Fox, Patrick J., and McDermott, Samuel D. Analyzing the gamma-ray sky with wavelets. United States: N. p., 2018.
Web. doi:10.1103/PhysRevD.98.043009.
Balaji, Bhaskaran, Cholis, Ilias, Fox, Patrick J., & McDermott, Samuel D. Analyzing the gamma-ray sky with wavelets. United States. https://doi.org/10.1103/PhysRevD.98.043009
Balaji, Bhaskaran, Cholis, Ilias, Fox, Patrick J., and McDermott, Samuel D. Fri .
"Analyzing the gamma-ray sky with wavelets". United States. https://doi.org/10.1103/PhysRevD.98.043009. https://www.osti.gov/servlets/purl/1436722.
@article{osti_1436722,
title = {Analyzing the gamma-ray sky with wavelets},
author = {Balaji, Bhaskaran and Cholis, Ilias and Fox, Patrick J. and McDermott, Samuel D.},
abstractNote = {We analyze the gamma-ray sky at energies of 0.5 to 50 GeV using the undecimated wavelet transform on the sphere. Focusing on the inner 60°×60° of the sky, we identify and characterize four separate residuals beyond the expected Milky Way diffuse emission. We detect the Fermi bubbles, finding compelling evidence that they are diffuse in nature and contain very little small-scale structure. We detect the “cocoon” inside the southern bubble, and we also identify its northern counterpart above 2 GeV. The northern cocoon lies along the same axis but is ~30% dimmer than the southern one. We characterize the Galactic center excess, which we find extends up to 20° in |b|. At latitudes |b|≤5° we find evidence for power in small angular scales that could be the result of point-source contributions, but for |b|≥5° the Galactic center excess is dominantly diffuse in its nature. Our findings show either that the Galactic center excess and Fermi bubbles connect smoothly or that the bubbles brighten significantly below 15° in latitude. We find that the Galactic center excess appears off-center toward negative ℓ. Additionally, we find and characterize two emissions along the Galactic disk centered at ℓ≃+25° and -20°. Furthermore, these emissions are significantly more elongated along the Galactic disk than the Galactic center excess.},
doi = {10.1103/PhysRevD.98.043009},
journal = {Physical Review D},
number = 4,
volume = 98,
place = {United States},
year = {Fri Aug 10 00:00:00 EDT 2018},
month = {Fri Aug 10 00:00:00 EDT 2018}
}
Web of Science
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Composition of the Fermi-LAT isotropic gamma-ray background intensity: Emission from extragalactic point sources and dark matter annihilations
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- Di Mauro, Mattia; Donato, Fiorenza
- arXiv
The Galactic Center GeV Excess from a Series of Leptonic Cosmic-Ray Outbursts
text, January 2015
- Cholis, Ilias; Evoli, Carmelo; Calore, Francesca
- arXiv
Disrupted Globular Clusters Can Explain the Galactic Center Gamma Ray Excess
text, January 2015
- Brandt, Timothy D.; Kocsis, Bence
- arXiv
A review of indirect searches for particle dark matter
text, January 2016
- Gaskins, Jennifer M.
- arXiv
The Gamma-Ray Pulsar Population of Globular Clusters: Implications for the GeV Excess
text, January 2016
- Hooper, Dan; Linden, Tim
- arXiv
Galactic Bulge Preferred Over Dark Matter for the Galactic Center Gamma-Ray Excess
text, January 2016
- Macias, Oscar; Gordon, Chris; Crocker, Roland M.
- arXiv
A wavelet add-on code for new-generation N-body simulations and data de-noising (JOFILUREN)
text, January 2004
- Romeo, Alessandro B.; Horellou, Cathy; Bergh, Joeran
- arXiv
HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
text, January 2004
- Gorski, K. M.; Hivon, E.; Banday, A. J.
- arXiv
Wavelets, ridgelets and curvelets on the sphere
text, January 2005
- Starck, Jean-Luc; Moudden, Yassir; Abrial, Pierrick
- arXiv
The Complete Spectral Catalog of Bright BATSE Gamma-Ray Bursts
text, January 2006
- Kaneko, Yuki; Preece, Robert D.; Briggs, Michael S.
- arXiv
The Galactic Diffuse Gamma-ray Spectrum from Cosmic-ray Proton Interactions
text, January 1996
- Mori, Masaki
- arXiv
Structure Detection in Low Intensity X-Ray Images
text, January 1997
- Starck, Jean-Luc; Pierre, Marguerite
- arXiv
Diffuse continuum gamma rays from the Galaxy
text, January 1998
- Strong, A. W.; Moskalenko, I. V.; Reimer, O.
- arXiv