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The Compton Spectrometer and Imager

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arxiv 1908.04334 v1 pith:TKISN4YD submitted 2019-08-12 astro-ph.IM astro-ph.HE

classification astro-ph.IMastro-ph.HE
keywords cosicomptondescribescienceastro2020imagerspectrometeraccreting
verification ladder T0 review T1 audit T2 compute T3 formal
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In this Astro2020 APC White Paper, we describe a Small Explorer (SMEX) mission concept called the Compton Spectrometer and Imager. COSI is a Compton telescope that covers the bandpass often referred to as the "MeV Gap" because it is the least explored region of the whole electromagnetic spectrum. COSI provides a significant improvement in sensitivity along with high-resolution spectroscopy, enabling studies of 511 keV electron-positron annihilation emission and measurements of several radioactive elements that trace the Galactic history of supernovae. COSI also measures polarization of gamma-ray bursts (GRBs), accreting black holes, and pulsars as well as detecting and localizing multimessenger sources. In the following, we describe the COSI science, the instrument, and its capabilities. We highlight many Astro2020 science WPs that describe the COSI science in depth.

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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 39 citations worldwide. Full citation record

  1. Stellar flares cannot explain the Galactic 511 keV emission

    astro-ph.GA 2026-07 conditional novelty 6.0 of 10

    Stellar flares fall short by orders of magnitude and cannot match the morphology of the Galactic 511 keV positron-annihilation signal.

  2. The most distant $\gamma$-ray flare to date: a multiwavelength campaign on the $z = 4.715$ blazar GB6 B1428+4217

    astro-ph.HE 2025-07 conditional novelty 6.0 of 10

    The most distant gamma-ray flare to date, from the z=4.715 blazar GB6 B1428+4217, was followed across the spectrum and shown to be Compton-dominated, in line with the blazar sequence.

  3. Axion-like particle constraints from preSN in future experiments

    hep-ph 2025-06 conditional novelty 4.0 of 10

    Using existing ALP flux models for Betelgeuse, the author projects that upcoming MeV missions could discover axion-like particles in a coupling region beyond current limits.

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