Dark Matter Shines: Galaxy Center Mystery Solved?
Here’s a breakdown of the key information from the provided text:
Main topic: The source of excess gamma ray emissions at the center of the Milky Way – is it dark matter or pulsars?
Key Points:
* Pulsars as a Source: Neutron stars, specifically pulsars, are strong sources of gamma rays. It was hypothesized that the excess gamma emissions from the Milky Way’s center could be due to a large, previously undetected population of pulsars.
* distinction via Emission Maps: Astrophysicists created a model to differentiate between dark matter and pulsars.
* Dark Matter: Would produce a smooth and continuous gamma ray emission map.
* Pulsars: Would produce a lumpy map, with each lump corresponding to a pulsar.
* initial Findings (2015): Analysis of fermi signals using the model favored the pulsar hypothesis.
* New Data (Gaia): Data from the Gaia mission reveals the Milky Way has experienced turbulent events,including collisions with dwarf galaxies. This new information is prompting a re-evaluation of the source of the gamma ray emissions.
In essence, the text describes a scientific debate about the origin of gamma rays from the galactic center, and how new data is challenging previous conclusions.