Researchers have used gamma rays to detect a small neighboring galaxy. According to a new study recently published in the journal Nature Astronomy, an international team of researchers has discovered a small satellite galaxy of the Milky Way filled with dark matter, but its emissions are more like
Associate Professor Roland Crocker, and including Kavli IPMU Visiting Scientists Shunsaku Horiuchi and Shin’ichiro Ando, analyzed data from GAIA and Fermi space telescopes to reveal that the Fermi cocoon is actually due to emission from the Sagittarius dwarf galaxy.
This satellite galaxy of the Milky Way is seen through the Fermi Bubbles from our position on Earth . Due to its tight orbit around our Galaxy and previous passages through the galactic disk, it has lost most of its interstellar gas and many of its stars have been ripped from its core into elongated streams.
Millisecond pulsars are remnants of certain types of stars, significantly more massive than the Sun, that are in close binary systems, but now blast out cosmic particles as a result of their extreme rotational energies. The electrons fired by millisecond pulsars collide with low-energy photons of the Cosmic Microwave Background propelling them to high-energy gamma radiation.
Their discovery sheds light on millisecond pulsars as efficient accelerators of highly-energetic electrons and positrons, and also suggests that similar physical processes could be ongoing in other dwarf satellite galaxies of the Milky Way.
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