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The Compton Spectrometer and Imager
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The Compton Spectrometer and Imager (COSI) is a NASA Small Explorer (SMEX) satellite mission in development with a planned launch in 2027. COSI is a wide-field gamma-ray telescope designed to survey the entire sky at 0.2-5 MeV. It provides imaging, spectroscopy, and polarimetry of astrophysical sources, and its germanium detectors provide excellent energy resolution for emission line measurements. Science goals for COSI include studies of 0.511 MeV emission from antimatter annihilation in the Galaxy, mapping radioactive elements from nucleosynthesis, determining emission mechanisms and source geometries with polarization measurements, and detecting and localizing multimessenger sources. The instantaneous field of view for the germanium detectors is >25% of the sky, and they are surrounded on the sides and bottom by active shields, providing background rejection as well as allowing for detection of gamma-ray bursts and other gamma-ray flares over most of the sky. In the following, we provide an overview of the COSI mission, including the science, the technical design, and the project status.
Forward citations
Cited by 9 Pith papers
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Dark Photons from Perturbative Decay of a Misaligned Higgs Field
Stochastically misaligned dark Higgs decay into dark photons can make all the dark matter for m_A′ ≈ 100 eV–1 GeV and g ≈ 10^-15–10^-10, shrinking to 10 keV–1 MeV with one-loop kinetic mixing.
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Constraints on High-Frequency Gravitational Waves from Graviton-Photon Conversion in the M87 Galaxy
Graviton–photon conversion in M87's magnetic field sets h_c and Ωgw h² limits 1–5 orders of magnitude tighter than Milky Way-based bounds across 10^10–10^27 Hz.
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Effects of Bethe-Heitler pair production in ultraluminous X-ray sources
Secondary pairs from Bethe-Heitler interactions of relativistic protons in ULX funnels can produce 0.1-100 MeV emission at 10^34 to 10^38 erg/s, a testable hadronic signature.
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Axion lines from nuclear de-excitations in galactic stellar populations
No 14.4 keV axion line from 57Fe de-excitations is seen by NuSTAR toward M87, M82, M31, or the Galactic Center, yielding |g_ann x g_aγγ| < 1.1e-22 GeV^-1 for m_a < 1e-10 eV.
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XL-Calibur Polarimetry of Cyg X-1 Further Constrains the Origin of its Hard-state X-ray Emission
XL-Calibur measured a 19-64 keV polarization degree of 5.0(+2.7/-3.0)% and angle -28 +/- 17 degrees for Cygnus X-1, consistent with IXPE and jet alignment, though with only 8.7% chance probability.
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Benchmarking of Geant4 simulations for the COSI Anticoincidence System
Geant4 simulations with optical physics reproduce the COSI BGO shield response within 20% in energy resolution and 10% in spatial uniformity, and generate a position-dependent correction matrix.
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The most distant $\gamma$-ray flare to date: a multiwavelength campaign on the $z = 4.715$ blazar GB6 B1428+4217
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.
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Minimal Majoron Dark Matter from a Discrete $Z_N$ Gauge Symmetry
Discrete Z_N-protected majoron dark matter excludes Z_5, leaves Z_7/Z_11/Z_13 viable, and predicts a 1–10 MeV Z_7 majoron testable by COSI through 511 keV and γγ lines.
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Supermassive black holes and their surroundings: MeV signatures
A review of open questions in supermassive black hole physics that argues the MeV gamma-ray band is the critical missing observational window.
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