Evaluation of hadronic emission in starburst galaxies and star-forming galaxies

In this work, we reanalyzed 11 years of spectral data from the Fermi Large Area Telescope ( Fermi -LAT) of currently observed starburst galaxies (SBGs) and star-forming galaxies (SFGs). We used a one-zone model provided by NAIMA and the hadronic origin to explain the GeV observation data of the SBGs...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2021-11, Vol.21 (10), p.263
Main Authors: Xiang, Yun-Chuan, Jiang, Ze-Jun, Tang, Yun-Yong
Format: Article
Language:English
Subjects:
Emission analysis
Energy bands
Energy budget
Galaxies
galaxies: star formation
galaxies: starburst
gamma rays: galaxies
Milky Way
Modelling
Proton energy
Protons
radiation mechanisms: non-thermal
Spectra
Star formation
Starburst galaxies
Stellar evolution
Supernova
Supernova remnants
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Summary:In this work, we reanalyzed 11 years of spectral data from the Fermi Large Area Telescope ( Fermi -LAT) of currently observed starburst galaxies (SBGs) and star-forming galaxies (SFGs). We used a one-zone model provided by NAIMA and the hadronic origin to explain the GeV observation data of the SBGs and SFGs. We found that a protonic distribution of a power-law form with an exponential cutoff can explain the spectra of most SBGs and SFGs. However, it cannot explain the spectral hardening components of NGC 1068 and NGC 4945 in the GeV energy band. Therefore, we considered the two-zone model to well explain these phenomena. We summarized the features of two model parameters, including the spectral index, cutoff energy, and proton energy budget. Similar to the evolution of supernova remnants (SNRs) in the Milky Way, we estimated the protonic acceleration limitation inside the SBGs to be the order of 10 2 TeV using the one-zone model; this is close to those of SNRs in the Milky Way.
ISSN:1674-4527
DOI:10.1088/1674-4527/21/10/263