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Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload

  • Authors: Jarred M. Roberts, Steven Boggs, Thomas Siegert, John A. Tomsick, Marco Ajello, Peter von Ballmoos, Jacqueline Beechert, Floriane Cangemi, Savitri Gallego, Pierre Jean, Chris Karwin, Carolyn Kierans, Hadar Lazar, Alex Lowell, Israel Martinez Castellanos, Sean Pike, Clio Sleator, Yong Sheng, Hiroki Yoneda, Andreas Zoglauer

Jarred M. Roberts et al 2025 The Astrophysical Journal 979 .

  • Provider: AAS Journals

Caption: Figure 7.

Left: Cygnus X-1 RL image generated from the 2016 COSI-Balloon flight data. The pixels are separated into 6◦ bins, and the cyan circle drawn at the known source location with the ARM radius of 8° is shown to represent the instrument resolution for the energy bin 325–480 keV Right: Cygnus X-1 spectrum as measured by NuSTAR (black, red), Swift-BAT (green), INTEGRAL/IBIS (cyan), and the COSI-Balloon instrument (blue), fit with a cutoff power law. The fit has a cutoff energy of 134.8 keV and reduced-χ2 value of 1.4 (see Table 3).

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