Academic Journal
Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload
| العنوان: | Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload |
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| المؤلفون: | 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 |
| المصدر: | The Astrophysical Journal, Vol 979, Iss 2, p 116 (2025) |
| بيانات النشر: | IOP Publishing |
| سنة النشر: | 2025 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | Gamma-ray astronomy, Gamma-ray detectors, Gamma-ray sources, Gamma-ray telescopes, Gamma-rays, Neutron stars, Astrophysics, QB460-466 |
| الوصف: | The Compton Spectrometer and Imager balloon payload (COSI-Balloon) is a wide field-of-view Compton gamma-ray telescope that operates in the 0.2–5 MeV bandpass. COSI-Balloon had a successful 46 day flight in 2016 during which the instrument observed the Crab Nebula, Cygnus X-1, and Centaurus A. Using the data collected by the COSI-Balloon instrument during this flight, we present the source flux extraction of signals from the variable balloon background environment and produce images of these background-dominated sources by performing Richardson–Lucy deconvolutions. We also present the spectra measured by the COSI-Balloon instrument, compare and combine them with measurements from other instruments, and fit the data. The Crab Nebula was observed by COSI-Balloon, and we obtain a measured flux in the energy band 325–480 keV of (4.5 ± 1.6) × 10 ^3 ph cm ^−2 s ^−1 . The model that best fits the COSI-Balloon data combined with measurements from NuSTAR and Swift-BAT is a broken power law with a measured photon index Γ = 2.20 ± 0.02 above the 43 keV break. Cygnus X-1 was also observed during this flight, and we obtain a measured flux of (1.4 ± 0.2) × 10 ^3 ph cm ^−2 s ^−1 in the same energy band and a best-fit result (including data from NuSTAR, Swift-BAT, and INTEGRAL/IBIS) was a cutoff power law with a high-energy cutoff energy of 138.3 ± 1.0 keV and a photon index of Γ = 1.358 ± 0.002. Finally, we present the measured spectrum of Centaurus A and our best model fit to a power law with a photon index of Γ = 1.73 ± 0.01. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | https://doi.org/10.3847/1538-4357/ad968a; https://doaj.org/toc/1538-4357; https://doaj.org/article/c7735d7f54a7467584f27cb6bb9bd268 |
| DOI: | 10.3847/1538-4357/ad968a |
| الاتاحة: | https://doi.org/10.3847/1538-4357/ad968a https://doaj.org/article/c7735d7f54a7467584f27cb6bb9bd268 |
| رقم الانضمام: | edsbas.82DB39B3 |
| قاعدة البيانات: | BASE |
| DOI: | 10.3847/1538-4357/ad968a |
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