{"id":546,"date":"2023-05-23T13:30:22","date_gmt":"2023-05-23T11:30:22","guid":{"rendered":"https:\/\/web.infn.it\/km3net-napoli\/?page_id=546"},"modified":"2024-02-06T12:13:44","modified_gmt":"2024-02-06T11:13:44","slug":"neutrinos-from-starburst-galaxies","status":"publish","type":"page","link":"https:\/\/web.infn.it\/km3net-napoli\/neutrinos-from-starburst-galaxies\/","title":{"rendered":"Neutrinos from Starburst Galaxies"},"content":{"rendered":"\n
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\"Credits:<\/figure>\n<\/div>\n<\/div>\n\n\n\n
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Starburst Galaxy (SGB) Studies<\/mark><\/h2>\n<\/div>\n<\/div>\n\n\n\n
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Starburst galaxies, which are known as ‘reservoirs’ of high-energy cosmic-rays, can represent an important high-energy neutrino “factory” contributing to the diffuse neutrino flux observed by IceCube<\/a>. The studies presented here went beyond the standard prototype-based approach leading to a simple power-law neutrino flux, and investigate a more realistic model based on a data-driven blending of spectral indexes, thereby capturing the observed changes in the properties of individual emitters. The initial phenomenological analysis was based on a multi-messenger analysis considering the extragalactic gamma-ray background (EGB) measured by Fermi-LAT and different IceCube data samples: the 7.5-year high-energy starting events (HESE) and the
6-year high-energy cascade data. Remarkably, we found that, differently from the highly-constrained prototype scenario, the spectral index blending allows starburst galaxies to account for up to 40% of the HESE flux at 95.4% confidence level, while satisfying the limit on the non-blazar EGB component.<\/p>\n<\/div>\n\n\n\n

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\"NASA,<\/figure>\n<\/div>\n<\/div>\n\n\n\n
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Hubble picture of the core of spiral galaxy Messier 61.<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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Moreover for each known SBG we tested the hypothesis that the observed gamma-ray fluxes are mostly due to star-forming activity, in agreement with the available star formation rates coming from IR and UV observations. Through this observation-based approach, we determined the most likely neutrino counterpart from star-forming and starburst galaxies and quantitatively assess the ability of current and upcoming neutrino telescopes to detect them as point-like sources. Remarkably, we found that the cores of the Small Magellanic Cloud and the Circinus galaxy are potentially observable by KM3NeT\/ARCA with 6 years of observation. Moreover, most of the nearby galaxies are likely to be just a factor of a few below the KM3NeT and IceCube-Gen2 point-like sensitivities.

To explore the possibility to constrain the reported diffuse and point-like scenarios for SBGs we proceeded to obtain the differential sensitivity of the incoming KM3NeT\/ARCA.
In particular we performed a maximum likelihood analysis with the ARCA Monte Carlo simulation considering 10 energy bins between 100 GeV and 100 PeV. Both diffuse and point-like analysis showed that in the near future the ARCA telescope may provide compelling evidence of star-forming activity as a tracer of neutrino production.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Starburst Galaxy (SGB) Studies Starburst galaxies, which are known as ‘reservoirs’ of high-energy cosmic-rays, can represent an important high-energy neutrino “factory” contributing to the diffuse neutrino flux observed by IceCube. The studies presented here went beyond the standard prototype-based approach leading to […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-fullwidth","meta":{"footnotes":""},"class_list":["post-546","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/web.infn.it\/km3net-napoli\/wp-json\/wp\/v2\/pages\/546","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/web.infn.it\/km3net-napoli\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/web.infn.it\/km3net-napoli\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/web.infn.it\/km3net-napoli\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/web.infn.it\/km3net-napoli\/wp-json\/wp\/v2\/comments?post=546"}],"version-history":[{"count":30,"href":"https:\/\/web.infn.it\/km3net-napoli\/wp-json\/wp\/v2\/pages\/546\/revisions"}],"predecessor-version":[{"id":1074,"href":"https:\/\/web.infn.it\/km3net-napoli\/wp-json\/wp\/v2\/pages\/546\/revisions\/1074"}],"wp:attachment":[{"href":"https:\/\/web.infn.it\/km3net-napoli\/wp-json\/wp\/v2\/media?parent=546"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}