International audienceWe use 15 years of $\gamma$-ray data from INTEGRAL/SPI in a refined investigation of the morphology of the Galactic bulge positron annihilation signal. Our spatial analysis confirms that the signal traces the old stellar population in the bulge and reveals for the first time that it traces the boxy bulge and nuclear stellar bulge. Using a 3D smoothing kernel, we find that the signal is smeared out over a characteristic length scale of $150 \pm 50\,$pc, suggesting either annihilation in situ at astrophysical sources kicked at formation or positron propagation away from sources. The former is disfavoured by its requiring kick velocities different between the Galactic nucleus ($\gtrsim 50\,\mathrm{km\,s^{-1}}$) and wider ...
The imaging spectrometer SPI on board ESA's INTEGRAL observatory provides us with an unprecedented v...
Context. The annihilation of cosmic positrons with electrons in the interstellar medium results in t...
We consider the phenomenology of the 511 keV emission in the Galactic bulge, as recently observed by...
International audienceWe use 15 years of $\gamma$-ray data from INTEGRAL/SPI in a refined investigat...
The Galactic bulge/disk ratio of 511 keV positron annihilation radiation measured by INTE-GRAL/SPI a...
International audienceThe first γ-ray line originating from outside the Solar System that was ever d...
International audienceThe 511 keV line from positron annihilation in the Galaxy was the first $\gamm...
The annihilation of positrons in the Milky Way Galaxy has been observed for ∼50 years; however, the ...
The 511 keV line from positron annihilation in the Galaxy was the first gamma-ray line detected to o...
International audienceContext. The Galaxy hosts a widespread population of low-energy positrons reve...
Context. The annihilation of positrons in the Galaxy’s interstellar medium produces characteristic g...
The imaging spectrometer SPI on board ESA's INTEGRAL observatory provides us with an unprecedented v...
Context. The annihilation of cosmic positrons with electrons in the interstellar medium results in t...
We consider the phenomenology of the 511 keV emission in the Galactic bulge, as recently observed by...
International audienceWe use 15 years of $\gamma$-ray data from INTEGRAL/SPI in a refined investigat...
The Galactic bulge/disk ratio of 511 keV positron annihilation radiation measured by INTE-GRAL/SPI a...
International audienceThe first γ-ray line originating from outside the Solar System that was ever d...
International audienceThe 511 keV line from positron annihilation in the Galaxy was the first $\gamm...
The annihilation of positrons in the Milky Way Galaxy has been observed for ∼50 years; however, the ...
The 511 keV line from positron annihilation in the Galaxy was the first gamma-ray line detected to o...
International audienceContext. The Galaxy hosts a widespread population of low-energy positrons reve...
Context. The annihilation of positrons in the Galaxy’s interstellar medium produces characteristic g...
The imaging spectrometer SPI on board ESA's INTEGRAL observatory provides us with an unprecedented v...
Context. The annihilation of cosmic positrons with electrons in the interstellar medium results in t...
We consider the phenomenology of the 511 keV emission in the Galactic bulge, as recently observed by...