The Fermi-LAT GeV Excess Traces Stellar Mass in the Galactic Bulge

Abstract

An anomalous emission component at energies of a few GeV and located towards the inner Galaxy is present in the Fermi-LAT data. It is known as the Fermi-LAT GeV excess. Using almost 8 years of data we reanalyze the characteristics of this excess with SkyFACT, a novel tool that combines image reconstruction with template fitting techniques. We find that an emission profile that traces stellar mass in the boxy and nuclear bulge provides the best description of the excess emission, providing strong circumstantial evidence that the excess is due to a stellar source population in the Galactic bulge. We find a luminosity to stellar mass ratio of $(2.1\pm 0.2)\times 10^{27}\mathrm{erg}{\mathrm{s}}^{-1}{\mathrm{M}}_{\odot }^{-1}$ for the boxy bulge, and of $(1.4\pm 0.6)\times 10^{27}\mathrm{erg}{\mathrm{s}}^{-1}{\mathrm{M}}_{\odot }^{-1}$ for the nuclear bulge. Stellar mass related templates are preferred over conventional DM profiles with high statistical significance.

arXiv comment7 pages, 4 figures, 1 table + supplemental material

References in corpus (67)

• A Universal Density Profile from Hierarchical Clustering
• The ATNF Pulsar Catalogue
• Monitoring stellar orbits around the Massive Black Hole in the Galactic Center
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• The Interstellar Environment of our Galaxy
• The Diversity and Similarity of Simulated Cold Dark Matter Halos
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Mass models of the Milky Way
• Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium
• Empirical models for Dark Matter Halos. I. Nonparametric Construction of Density Profiles and Comparison with Parametric Models
• Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
• The Characterization of the Gamma-Ray Signal from the Central Milky Way: A Compelling Case for Annihilating Dark Matter
• Improved Estimates of the Milky Way's Stellar Mass and Star Formation Rate from Hierarchical Bayesian Meta-Analysis
• The Nuclear Bulge of the Galaxy. III. Large-Scale Physical Characteristics of Stars and Interstellar Matter
• Background model systematics for the Fermi GeV excess
• The Fermi Galactic Center GeV Excess and Implications for Dark Matter
• Fermi-LAT Observations of High-Energy Gamma-Ray Emission Toward the Galactic Center
• Dynamical modelling of the Galactic bulge and bar: the Milky Way's bar pattern speed, stellar, and dark matter mass distribution
• The Structure of the Milky Way's Bar Outside the Bulge
• unWISE: unblurred coadds of the WISE imaging
• The all-sky distribution of 511 keV electron-positron annihilation emission
• Strong support for the millisecond pulsar origin of the Galactic center GeV excess
• The Spectrum and Morphology of the Fermi Bubbles
• Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
• COBE's Galactic Bar and Disk
• Two Red Clumps and the X-Shaped Milky Way Bulge
• Evidence for Unresolved Gamma-Ray Point Sources in the Inner Galaxy
• Global cosmic-ray related luminosity and energy budget of the Milky Way
• The Split Red Clump of the Galactic Bulge from OGLE-III
• The e-ASTROGAM mission (exploring the extreme Universe with gamma rays in the MeV-GeV range)
• The long bar as seen by the VVV survey: I. Colour-magnitude diagrams
• Stellar mass map and dark matter distribution in M31
• The Consistency of Fermi-LAT Observations of the Galactic Center with a Millisecond Pulsar Population in the Central Stellar Cluster
• Made-to-Measure models of the Galactic Box/Peanut bulge: stellar and total mass in the bulge region
• Gamma-ray spectroscopy of Positron Annihilation in the Milky Way
• Galactic Bulge Preferred Over Dark Matter for the Galactic Center Gamma-Ray Excess
• Disrupted Globular Clusters Can Explain the Galactic Center Gamma Ray Excess
• A New Photometric Model of the Galactic Bar using Red Clump Giants
• High-Energy Gamma Rays from the Milky Way: Three-Dimensional Spatial Models for the Cosmic-Ray and Radiation Field Densities in the Interstellar Medium
• The X-shaped Bulge of the Milky Way revealed by WISE
• Before the Bar: Kinematic Detection of A Spheroidal Metal-Poor Bulge Component
• Cosmic Ray Electrons, Positrons and the Synchrotron emission of the Galaxy: consistent analysis and implications
• Observations of M31 and M33 with the Fermi Large Area Telescope: a galactic center excess in Andromeda?
• Peanuts, brezels and bananas: food for thought on the orbital structure of the Galactic bulge
• A common solution to the cosmic ray anisotropy and gradient problems
• On the morphology of the electron-positron annihilation emission as seen by SPI/INTEGRAL
• Diffuse gamma-ray emission from galactic pulsars
• The High Time Resolution Universe Pulsar Survey VIII: The Galactic millisecond pulsar population
• Radio detection prospects for a bulge population of millisecond pulsars as suggested by Fermi LAT observations of the inner Galaxy
• A parametric description of the 3D structure of the Galactic Bar/Bulge using the VVV survey
• The Vertical X-shaped Structure in the Milky Way: Evidence from a Simple Boxy Bulge Model
• Towards a realistic astrophysical interpretation of the gamma-ray Galactic center excess
• Population synthesis of ultracompact X-ray binaries in the Galactic Bulge
• Unveiling the Gamma-ray Source Count Distribution Below the Fermi Detection Limit with Photon Statistics
• Source population synthesis and the Galactic diffuse gamma-ray emission
• Improved Cosmic-Ray Injection Models and the Galactic Center Gamma-Ray Excess
• SkyFACT: High-dimensional modeling of gamma-ray emission with adaptive templates and penalized likelihoods
• Statistical Measurement of the Gamma-ray Source-count Distribution as a Function of Energy
• Galactic dark matter search via phenomenological astrophysics modeling
• Analyzing γ-rays of the Galactic Center with Deep Learning
• Putting Things Back Where They Belong: Tracing Cosmic-Ray Injection with H2
• Estimating the GeV Emission of Millisecond Pulsars in Dwarf Spheroidal Galaxies
• A stacked analysis of 115 pulsars observed by the Fermi LAT
• Constraining Galactic dark matter with gamma-ray pixel counts statistics
• A method for comparing non-nested models with application to astrophysical searches for new physics
• Theoretical Models of the Galactic Bulge
• Does the SN rate explain the very high energy cosmic rays in the central 200 pc of our Galaxy?

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• A New Determination of the Millisecond Pulsar Gamma-Ray Luminosity Function and Implications for the Galactic Center Gamma-Ray Excess
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• Improved Modeling of the Discrete Component of the Galactic Interstellar Gamma-ray Emission and Implications for the Fermi-LAT Galactic Center Excess
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• Assessing the Impact of Hydrogen Absorption on the Characteristics of the Galactic Center Excess