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Probing the Galactic Diffuse Continuum Emission with COSI

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arxiv 2310.12206 v1 pith:AMZ56IBE submitted 2023-10-18 astro-ph.HE astro-ph.GAastro-ph.IM

Probing the Galactic Diffuse Continuum Emission with COSI

Christopher Karwin , Thomas Siegert , Jacqueline Beechert , John Tomsick , Troy Porter , Michela Negro , Carolyn Kierans , Marco Ajello
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Israel Martinez Castellanos Albert Shih Andreas Zoglauer Steven Boggs
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classification astro-ph.HE astro-ph.GAastro-ph.IM
keywords cosiballooncomptoncontinuumdiffuseemissionflightgalactic
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In 2016 the Compton Spectrometer and Imager (COSI) had a successful 46-day flight onboard NASA's Super Pressure Balloon platform. In this work we report measurements of the Galactic diffuse continuum emission (GDCE) observed towards the inner Galaxy during the flight, which in the COSI energy band (0.2 - 5 MeV) is primarily generated from inverse Compton radiation. Within uncertainties we find overall good agreement with previous measurements from INTEGRAL/SPI and COMPTEL. Based on these initial findings, we discuss the potential for further probing the GDCE with the 2016 COSI balloon data, as well as prospects for the upcoming satellite mission.

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  1. Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X

    hep-ph 2025-08 unverdicted novelty 5.0

    Projects COSI and AMEGO-X sensitivities to sub-GeV DM in vector-scalar portals, finding COSI leading in some regions beyond CMB limits and AMEGO-X covering most continuum cases.