Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload
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...
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2025-01-01
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| author | 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 |
| author_facet | 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 |
| author_sort | Jarred M. Roberts |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-c7735d7f54a7467584f27cb6bb9bd268 |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-c7735d7f54a7467584f27cb6bb9bd2682025-02-05T14:36:47ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01979211610.3847/1538-4357/ad968aImaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon PayloadJarred M. Roberts0https://orcid.org/0000-0002-7660-2740Steven Boggs1https://orcid.org/0000-0001-9567-4224Thomas Siegert2https://orcid.org/0000-0002-0552-3535John A. Tomsick3https://orcid.org/0000-0001-5506-9855Marco Ajello4https://orcid.org/0000-0002-6584-1703Peter von Ballmoos5https://orcid.org/0000-0002-0917-3392Jacqueline Beechert6https://orcid.org/0000-0002-0128-7424Floriane Cangemi7Savitri Gallego8https://orcid.org/0000-0002-2664-8804Pierre Jean9https://orcid.org/0000-0002-1757-9560Chris Karwin10https://orcid.org/0000-0002-6774-3111Carolyn Kierans11https://orcid.org/0000-0001-6677-914XHadar Lazar12https://orcid.org/0000-0002-2752-9524Alex Lowell13Israel Martinez Castellanos14https://orcid.org/0000-0002-2471-8696Sean Pike15https://orcid.org/0000-0002-8403-0041Clio Sleator16https://orcid.org/0000-0003-4732-6174Yong Sheng17https://orcid.org/0000-0002-3833-1054Hiroki Yoneda18https://orcid.org/0000-0002-5345-5485Andreas Zoglauer19https://orcid.org/0000-0001-9067-3150Dept. of Astronomy and Astrophysics, University of California, San Diego , 9500 Gilman Drive, La Jolla, CA 92093, USADept. of Astronomy and Astrophysics, University of California, San Diego , 9500 Gilman Drive, La Jolla, CA 92093, USAFakultät für Physik und Astronomie, Institut für Theoretische Physik und Astrophysik, Lehrstuhl für Astronomie, Julius-Maximilians-Universität Würzburg , Emil-Fischer-Straße 31, D-97074 Würzburg, GermanySpace Sciences Laboratory, University of California, Berkeley , 7 Gauss Way, Berkeley, CA 94720, USADepartment of Physics and Astronomy, Clemson University , 118 Kinard Laboratory, Clemson, SC 29634, USAInstitut de Recherche en Astrophysique et Planétologie, Université de Toulouse , CNRS, CNES, Université Toulouse III Paul Sabatier, 9 avenue Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, FranceSpace Sciences Laboratory, University of California, Berkeley , 7 Gauss Way, Berkeley, CA 94720, USAUniversité-Paris Cité , 45 Rue des Saints-Pères, 75006 Paris, FranceInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität Mainz , 55099 Mainz, GermanyInstitut de Recherche en Astrophysique et Planétologie, Université de Toulouse , CNRS, CNES, Université Toulouse III Paul Sabatier, 9 avenue Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, FranceNASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USANASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USASpace Sciences Laboratory, University of California, Berkeley , 7 Gauss Way, Berkeley, CA 94720, USASpace Sciences Laboratory, University of California, Berkeley , 7 Gauss Way, Berkeley, CA 94720, USANASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USA; Center for Research and Exploration in Space Science and Technology , NASA/GSFC, Greenbelt, MD 20771, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USADept. of Astronomy and Astrophysics, University of California, San Diego , 9500 Gilman Drive, La Jolla, CA 92093, USANaval Research Laboratory , 4555 Overlook Avenue Southwest, Washington, DC 20375, USADepartment of Physics and Astronomy, Clemson University , 118 Kinard Laboratory, Clemson, SC 29634, USAFakultät für Physik und Astronomie, Institut für Theoretische Physik und Astrophysik, Lehrstuhl für Astronomie, Julius-Maximilians-Universität Würzburg , Emil-Fischer-Straße 31, D-97074 Würzburg, GermanySpace Sciences Laboratory, University of California, Berkeley , 7 Gauss Way, Berkeley, CA 94720, USAThe 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.https://doi.org/10.3847/1538-4357/ad968aGamma-ray astronomyGamma-ray detectorsGamma-ray sourcesGamma-ray telescopesGamma-raysNeutron stars |
| spellingShingle | 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 Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload The Astrophysical Journal Gamma-ray astronomy Gamma-ray detectors Gamma-ray sources Gamma-ray telescopes Gamma-rays Neutron stars |
| title | Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload |
| title_full | Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload |
| title_fullStr | Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload |
| title_full_unstemmed | Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload |
| title_short | Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload |
| title_sort | imaging and spectral fitting of bright gamma ray sources with the cosi balloon payload |
| topic | Gamma-ray astronomy Gamma-ray detectors Gamma-ray sources Gamma-ray telescopes Gamma-rays Neutron stars |
| url | https://doi.org/10.3847/1538-4357/ad968a |
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