” Where do the AMS-02 antihelium occasions originate from?” by Vivian Poulin, Pierre Salati, Ilias Cholis, Marc Kamionkowski and Joseph Silk, 28 January 2019, Physical Review D.DOI: 10.1103/ PhysRevD.99.023016.
” Constraints on the antistar fraction in the Solar System community from the 10-year Fermi Large Area Telescope gamma-ray source brochure” by Simon Dupourqué, Luigi Tibaldo and Peter von Ballmoos, 20 April 2021, Physical Review D.DOI: 10.1103/ PhysRevD.103.083016.
The Fermi Gamma-ray Space Telescope observes the cosmos utilizing the highest-energy type of light, providing an important window into the most severe phenomena of deep space, from gamma-ray bursts and black-hole jets to pulsars, supernova remnants, and the origin of cosmic rays. Credit: © Daniëlle Futselaar/MPIfR (artsource.nl).
It is known that the crash in between antimatter and matter produces gamma rays, the most energetic kind of radiation. This is why, in a paper published in the journal Physical Review D, IRAP scientists used 10 years of data from the Fermi gamma-ray area telescope to approximate the optimum number of anti-stars in our Galaxy.
They had the ability to separate fourteen prospects whose emission properties are equivalent to those expected for antistars in the brochure of gamma-ray sources discovered by Fermi. The nature of these sources is still unconfirmed. It is much more most likely that they are actually pulsars, black holes, or other kinds of well-established gamma-ray emitters.
The IRAP group then approximated the maximum number of anti-stars that might exist in our Galaxy, leading to the strongest constraints ever. By envisioning that they are dispersed like common stars, mostly in the stellar disk, they were able to establish that there is at most one antistar for each 300,000 ordinary stars.
They also showed that old anti-stars, whose origin would go back to the beginnings of the Universe, could more quickly conceal from gamma-ray telescopes in the halo around the Galaxy.
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Position in the sky of the various prospects of the Fermi brochure. The background map reveals the minimum brightness of an anti-star for it to be observed by Fermi. The clear parts represent the parts of the sky where the observations are the easiest. Credit: IRAP
Are there anti-stars around us? Answer from the Fermi Gamma-ray Space Telescope.
What if a few of the antimatter that was believed to have disappeared was hiding around us in the form of anti-stars? Researchers from the Institute for Research in Astrophysics and Planetology (IRAP– CNRS/CNES/UT3 Paul Sabatier) are using the Fermi gamma-ray space telescope to put the most constraining limits ever on this hypothesis.
What is antimatter? It is often associated with the world of science fiction, antimatter does certainly exist. It is observed in outer area and in physics labs. It is a state in proportion to the regular matter we understand. According to the laws of physics understood to date, the Universe must consist of equal amounts of matter and antimatter. Today antimatter is just discovered at the trace level, and research suggests that the entire Cosmos is devoid of it. This is currently considered as one of the greatest secrets of deep space.
The Alpha Magnetic Spectrometer (AMS) particle detector on board the International Space Station (ISS) recently appears to show that there might be more antimatter around us than we believed. This may be hiding in the vicinity of our solar system in the form of not likely things: stars made of antimatter, or anti-stars.
Position in the sky of the various prospects of the Fermi brochure. The background map reveals the minimum brightness of an anti-star for it to be observed by Fermi. This is why, in a paper published in the journal Physical Review D, IRAP researchers used 10 years of information from the Fermi gamma-ray space telescope to approximate the optimum number of anti-stars in our Galaxy. They were able to isolate fourteen candidates whose emission properties are equivalent to those expected for antistars in the catalog of gamma-ray sources discovered by Fermi. It is much more likely that they are in fact pulsars, black holes, or other types of reputable gamma-ray emitters.
