Imaging and Spectral Fitting of Bright Gamma-ray Sources with the COSI Balloon Payload
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929617193926656 |
|---|---|
| author | Roberts, Jarred M. Boggs, Steven Siegert, Thomas Tomsick, John A. Ajello, Marco von Ballmoos, Peter Beechert, Jacqueline Cangemi, Floriane Gallego, Savitri Jean, Pierre Karwin, Chris Kierans, Carolyn Lazar, Hadar Lowell, Alex Castellanos, Israel Martinez Pike, Sean Sleator, Clio Sheng, Yong Yoneda, Hiroki Zoglauer, Andreas |
| author_facet | Roberts, Jarred M. Boggs, Steven Siegert, Thomas Tomsick, John A. Ajello, Marco von Ballmoos, Peter Beechert, Jacqueline Cangemi, Floriane Gallego, Savitri Jean, Pierre Karwin, Chris Kierans, Carolyn Lazar, Hadar Lowell, Alex Castellanos, Israel Martinez Pike, Sean Sleator, Clio Sheng, Yong Yoneda, Hiroki Zoglauer, Andreas |
| contents | The Compton Spectrometer and Imager balloon payload (COSI-Balloon) is a wide-field-of-view Compton $γ$-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 ${\pm}$ 1.6) ${\times}$ 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 ${\pm}$ 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 ${\pm}$ 0.2) ${\times}$ 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 to a cutoff power law with a high-energy cutoff energy of 138.3 ${\pm}$ 1.0 keV and a photon index of $Γ$ = 1.358 ${\pm}$ 0.002. Lastly, 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 ${\pm}$ 0.01. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_04721 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Imaging and Spectral Fitting of Bright Gamma-ray Sources with the COSI Balloon Payload Roberts, Jarred M. Boggs, Steven Siegert, Thomas Tomsick, John A. Ajello, Marco von Ballmoos, Peter Beechert, Jacqueline Cangemi, Floriane Gallego, Savitri Jean, Pierre Karwin, Chris Kierans, Carolyn Lazar, Hadar Lowell, Alex Castellanos, Israel Martinez Pike, Sean Sleator, Clio Sheng, Yong Yoneda, Hiroki Zoglauer, Andreas High Energy Astrophysical Phenomena Astrophysics of Galaxies The Compton Spectrometer and Imager balloon payload (COSI-Balloon) is a wide-field-of-view Compton $γ$-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 ${\pm}$ 1.6) ${\times}$ 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 ${\pm}$ 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 ${\pm}$ 0.2) ${\times}$ 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 to a cutoff power law with a high-energy cutoff energy of 138.3 ${\pm}$ 1.0 keV and a photon index of $Γ$ = 1.358 ${\pm}$ 0.002. Lastly, 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 ${\pm}$ 0.01. |
| title | Imaging and Spectral Fitting of Bright Gamma-ray Sources with the COSI Balloon Payload |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.04721 |