Discovery of a non-thermal radio source associated with the Galactic centre 511-keV annihilation-line source
نویسندگان
چکیده
منابع مشابه
The galactic 511 keV line from electroweak scale WIMPs
We consider possible mechanisms via which electroweak scale WIMPs χ could provide the source of the INTEGRAL/SPI 511 keV photon flux from the galactic centre. We consider scenarios where the WIMP spectrum contains near-degeneracies, with MeV-scale splitting, and focus on three possible production mechanisms for galactic positrons: (i) collisional excitation of the WIMP to a nearby charged state...
متن کاملThe Sky Distribution of 511 Kev Positron Annihilation Line Emission as Measured with Integral/spi
The imaging spectrometer SPI on board ESA’s INTEGRAL observatory provides us with an unprecedented view of positron annihilation in our Galaxy. The first sky maps in the 511 keV annihilation line and in the positronium continuum from SPI showed a puzzling concentration of annihilation radiation in the Galactic bulge region. By now, more than twice as many INTEGRAL observations are available, of...
متن کاملOn the Origin of the 511 keV Emission in the Galactic Centre
Diffuse 511 keV line emission, from the annihilation of cold positrons, has been observed in the direction of the Galactic Centre for more than 30 years. The latest high-resolution maps of this emission produced by the SPI instrument on INTEGRAL suggest at least one component of the emission is spatially coincident with the distribution of ∼70 luminous, low-mass X-ray binaries detected in the s...
متن کاملOn the 511 keV emission line of positron annihilation in the Milky Way
I review our current understanding of positron sources in the Galaxy, on the basis of the reported properties of the observed 511 keV annihilation line. It is argued here that most of the disk positrons propagate away fom the disk (due to the low density environment) and the resulting low surface brightness annihilation emission is currently undetectable by SPI/INTEGRAL. It is also argued that ...
متن کاملGRBs and the 511 keV emission of the Galactic bulge
We consider the phenomenology of the 511 keV emission in the Galactic bulge, as recently observed by INTEGRAL, and propose a model is which the positrons are produced by gamma-ray bursts (GRB) associated with mini starbursts in the central molecular zone (CMZ). We show that the positrons can easily diffuse across the bulge on timescales of ∼ 10 7 yr, and that their injection rate by GRBs is com...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1991
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/251.1.22p