Early SPI/INTEGRAL contraints on the morphology of the 511 keV line emission in the 4th galactic quadrant

Abstract

We provide first constraints on the morphology of the 511 keV line emission from the galactic centre region on basis of data taken with the spectrometer SPI on the INTEGRAL gamma-ray observatory. The data suggest an azimuthally symmetric galactic bulge component with FWHM of ~9 deg with a 2 sigma uncertainty range covering 6-18 deg. The 511 keV line flux in the bulge component amounts to (9.9+4.7-2.1) 10e-4 ph cm-2 s-1. No evidence for a galactic disk component has been found so far; upper 2 sigma flux limits in the range (1.4-3.4) 10e-3 ph cm-2 s-1 have been obtained that depend on the assumed disk morphology. These limits correspond to lower limits on the bulge-to-disk ratio of 0.3-0.6.

5 pages, 3 figures, accepted for publication in A&A

References in corpus (4)

• Early SPI/INTEGRAL measurements of galactic 511 keV line emission from positron annihilation
• TGRS Measurements of the Positron Annihilation Spectrum from the Galactic Center
• Comparative Studies of Line and Continuum Positron Annihilation Radiation
• Investigations of Positron Annihilation Radiation

Cited by in corpus (129)

• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• Secluded WIMP Dark Matter
• WIMP dark matter candidates and searches - current status and future prospects
• Charge separation induced by P-odd bubbles in QCD matter
• Exciting Dark Matter and the INTEGRAL/SPI 511 keV signal
• The all-sky distribution of 511 keV electron-positron annihilation emission
• Search for Invisible Decays of a Dark Photon Produced in e+e- Collisions at BaBar
• Hidden vector dark matter
• Stringent Constraint on Galactic Positron Production
• Positron annihilation spectrum from the Galactic Center region observed by SPI/INTEGRAL
• Anisotropy of the cosmic gamma-ray background from dark matter annihilation
• Gamma-ray spectroscopy of Positron Annihilation in the Milky Way
• Investigating electron interacting dark matter
• Gamma-ray continuum emission from the inner Galactic region as observed with INTEGRAL/SPI
• MeV-mass dark matter and primordial nucleosynthesis
• The sky distribution of positronium annihilation continuum emission measured with SPI/INTEGRAL
• Galactic Substructure and Dark Matter Annihilation in the Milky Way Halo
• Nonabelian dark matter: models and constraints
• Probing MeV Dark Matter at Low--Energy $e^{+}{e}^{-}$ Colliders
• WIMPonium
• Primordial Black Holes and $r$-Process Nucleosynthesis
• Dark matter pair-production in b -> s transitions
• Supernova Constraints on MeV Dark Sectors from e+ e- Annihilations
• Status of Dark Matter in the Universe
• An X-Ray Line from eXciting Dark Matter
• The galactic 511 keV line from electroweak scale WIMPs
• Dark Force Detection in Low Energy e-p Collisions
• Testing MeV dark matter with neutrino detectors
• Two photon annihilation of Kaluza-Klein dark matter
• Cold Dark Matter as Compact Composite Objects
• Sterile neutrino dark matter in $B-L$ extension of the standard model and galactic 511 keV line
• WMAP Haze: Directly Observing Dark Matter?
• Cosmological implications of supersymmetric axion models
• Galactic 511 keV line from MeV millicharged dark matter
• Astrophysical constraints from gamma-ray spectroscopy
• Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S)
• Early Annihilation and Diffuse Backgrounds in 1/v WIMP models
• On the intensity and spatial morphology of the 511 keV emission in the Milky Way
• Observation of Diffuse Cosmic and Atmospheric Gamma Rays at Balloon Altitudes with an Electron-tracking Compton Camera
• Hypernovae/GRB in the Galactic Center as possible sources of Galactic Positrons
• Freeze-in Production of Sterile Neutrino Dark Matter in U(1)${}_{\mathrm{B}-\mathrm{L}}$ Model
• Sterile Neutrinos and Light Dark Matter Save Each Other
• Enhanced Rare Pion Decays from a Model of MeV Dark Matter
• Dark Matter Annihilation: the origin of cosmic gamma-ray background at 1-20 MeV
• The Electrosphere of Macroscopic "Quark Nuclei": A Source for Diffuse MeV Emissions from Dark Matter
• INTEGRAL/SPI Limits on Electron-Positron Annihilation Radiation from the Galactic Plane
• String Photini at the LHC
• Axino Light Dark Matter and Neutrino Masses with R-parity Violation
• Search with EGRET for a Gamma Ray Line from the Galactic Center
• A new twist on excited dark matter: implications for INTEGRAL, PAMELA/ATIC/PPB-BETS, DAMA
• Antimatter in the Milky Way
• The impact of the phase-space density on the indirect detection of dark matter
• Can multistate dark matter annihilation explain the high-energy cosmic ray lepton anomalies?
• Could electron-positron annihilation lines in the Galactic center result from pulsar winds?
• Diffuse cosmic gamma-rays at 1-20 MeV: A trace of the dark matter?
• Gamma ray bursts and the origin of galactic positrons
• A Warped Model of Dark Matter
• Type-II Seesaw at Collider, Lepton Asymmetry and Singlet Scalar Dark Matter
• Metastable dark matter mechanisms for INTEGRAL 511 keV $\gamma$ rays and DAMA/CoGeNT events
• Width of the 511 KeV Line from the Bulge of the Galaxy
• Dark stars: Implications and constraints from cosmic reionization and extragalactic background radiation
• Cosmic gamma-ray background from Type Ia supernovae revisited: Evidence for missing gamma-rays at MeV
• 511 keV line from Q balls in the Galactic Center
• Soft gamma-ray background and light Dark Matter annihilation
• Beyond Minimal Lepton Flavored Dark Matter
• Electroweak Baryogenesis, CDM and Anomaly-free Supersymmetric U(1)-prime Models
• SPI/INTEGRAL observation of the Galactic central radian: contribution of discrete sources and implication for the diffuse emission
• Monopoles, strings and dark matter
• 26Al in the inner Galaxy
• 511 KeV photons from superconducting cosmic strings
• Cosmological Lower Bound on Dark Matter Masses from the Soft Gamma-ray Background
• Strong Optimized Conservative Fermi-LAT Constraints on Dark Matter Models from the Inclusive Photon Spectrum
• Magnetic Fluffy Dark Matter
• SPI Measurements of Galactic 26Al
• Parity Violation in Composite Inelastic Dark Matter Models
• Unification of Dark Energy and Dark Matter
• Dark matter and generation of galactic magnetic fields
• 511 keV line and diffuse gamma rays from moduli
• Is There a Dark Matter Signal in the Galactic Positron Annihilation Radiation?
• Dark Higgs Dark Matter
• Exciting dark matter in the galactic center
• Scalar Dark Matter Candidates -- Revisited
• Predictions of the causal entropic principle for environmental conditions of the universe
• Gamma-ray Observations of Explosive Nucleosynthesis Products
• Effects of a weakly interacting light U boson on the nuclear equation of state and properties of neutron stars in relativistic models
• U-boson at BESIII
• The Cosmic Ray Distribution in Sagittarius B
• Global $U(1{)}_L$ Breaking in Neutrinophilic 2HDM: From LHC Signatures to X-Ray Line
• Secluded Dark Matter Coupled to a Hidden CFT
• White dwarf axions, PAMELA data, and flipped-SU(5)
• Effects of nuclear symmetry energy on eta meson production and its rare decay to the dark U-boson in heavy-ion reactions
• $U(1{)}_{L_{\mu }-L_{\tau }}$ for Light Dark Matter, $g_{\mu }-2$, the $511$ keV excess and the Hubble Tension
• Steady-state nucleosynthesis throughout the Galaxy
• Dark Matter from Conformal Sectors
• Compact strange stars with a medium dependence in gluons at finite temperature
• Cosmic Microwave Background Constraints on Dark Matter Models of the Galactic Center 511 keV Signal
• Effect of Population III Multiplicity on Dark Star Formation
• Small radii of neutron stars as an indication of novel in-medium effects
• Can past gamma-ray bursts explain both INTEGRAL and ATIC/PAMELA/Fermi anomalies simultaneously?
• Detecting an invisible Higgs boson at Fermilab Tevatron and CERN LHC
• Z_2-Singlino Dark Matter in a Portal-Like Extension of the Minimal Supersymmetric Standard Model
• Abelian dark matter models for 511 keV gamma rays and direct detection
• Dark Matter Astrophysics
• Sterile neutrino dark matter with dipole interaction
• Radiative Seesaw Model with Degenerate Majorana Dark Matter
• Some Comments on an MeV Cold Dark Matter Scenario
• Light superconducting strings in the Galaxy
• A Magnetic-Monopole-Based Mechanism to the formation of the Hot Big Bang Modeled Universe
• Equation of state and hybrid star properties with the weakly interacting light U-boson in relativistic models
• A signature for the absence of event horizons
• New Constraints on Decaying Dark Matter from INTEGRAL/SPI
• A unified model of supernova driven by magnetic monopoles
• Radio Synchrotron Emission from Secondary Leptons in the Vicinity of Sgr A*
• Gamma-Ray Line Astronomy
• Cold Positrons from Decaying Dark Matter
• Low Energy INTEGRAL Positrons from eXciting Dark Matter
• Freeze-in production of sterile neutrino dark matter in a gauged U$(1{)}^{\prime }$ model with inverse seesaw
• Zero modes on cosmic strings in an external magnetic field
• A possible influence on standard model of quasars and active galactic nuclei in strong magnetic field
• Magnetized matter effects on dilaton photon mixing
• Dark Matter Candidates
• Positron Annihilations at the Galactic Center: Generating More Questions Than Answers
• Prospects for the detection of Dark Matter with Long-lived Mediators in the Sun using the Southern Wide-field Gamma-ray Observatory
• Observing with a space-borne gamma-ray telescope: selected results from INTEGRAL
• Darker matter generating from the dark
• The Forward Physics Facility at the High-Luminosity LHC
• Sterile neutrino dark matter from a TeV Scale Seesaw
• A new model of quasar mass evolution
• Higgs Model Coupled to Dark Photons