Probing the Era of Galaxy Formation via TeV Gamma Ray Absorption by the Near Infrared Extragalactic Background
We present models of the extragalactic background light (EBL) based on several scenarios of galaxy formation and evolution. We have treated galaxy formation with the Press-Schecter approximation for both cold dark matter (CDM) and cold+hot dark matter (CHDM) models, representing a moderate (\(z_f \s...
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| description | We present models of the extragalactic background light (EBL) based on several scenarios of galaxy formation and evolution. We have treated galaxy formation with the Press-Schecter approximation for both cold dark matter (CDM) and cold+hot dark matter (CHDM) models, representing a moderate (\(z_f \sim 3\)) and a late (\(z_f \sim 1\)) era of galaxy formation respectively. Galaxy evolution has been treated by considering a variety of stellar types, different initial mass functions and star formation histories, and with an accounting of dust absorption and emission. We find that the dominant factor influencing the EBL is the epoch of galaxy formation. A recently proposed method for observing the EBL utilizing the absorption of \(\sim 0.1\) to 10 TeV gamma-rays from active galactic nuclei (AGN) is shown to be capable of discriminating between different galaxy formation epochs. The one AGN viewed in TeV light, Mrk 421, does show some evidence for a cutoff above 3 TeV; based on the EBL models presented here, we suggest that this is due to extinction in the source. The large absorption predicted at energies \(>200\) GeV for sources at \(z>0.5\) indicates that observations of TeV gamma-ray bursts (GRB) would constrain or eliminate models in which the GRB sources lie at cosmological distances. |
| doi_str_mv | 10.48550/arxiv.9504032 |
| format | Article |
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We have treated galaxy formation with the Press-Schecter approximation for both cold dark matter (CDM) and cold+hot dark matter (CHDM) models, representing a moderate (\(z_f \sim 3\)) and a late (\(z_f \sim 1\)) era of galaxy formation respectively. Galaxy evolution has been treated by considering a variety of stellar types, different initial mass functions and star formation histories, and with an accounting of dust absorption and emission. We find that the dominant factor influencing the EBL is the epoch of galaxy formation. A recently proposed method for observing the EBL utilizing the absorption of \(\sim 0.1\) to 10 TeV gamma-rays from active galactic nuclei (AGN) is shown to be capable of discriminating between different galaxy formation epochs. The one AGN viewed in TeV light, Mrk 421, does show some evidence for a cutoff above 3 TeV; based on the EBL models presented here, we suggest that this is due to extinction in the source. The large absorption predicted at energies \(>200\) GeV for sources at \(z>0.5\) indicates that observations of TeV gamma-ray bursts (GRB) would constrain or eliminate models in which the GRB sources lie at cosmological distances.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.9504032</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Active galactic nuclei ; Astronomical models ; Background radiation ; Cold dark matter ; Dark matter ; Galactic evolution ; Galaxies ; Gamma ray absorption ; Gamma ray bursts ; Gamma rays ; Near infrared radiation ; Star & galaxy formation ; Star formation ; Stellar evolution</subject><ispartof>arXiv.org, 1995-04</ispartof><rights>1995. This work is published under https://arxiv.org/licenses/assumed-1991-2003/license.html (the “License”). 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| language | eng |
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| source | Free E- Journals |
| subjects | Active galactic nuclei Astronomical models Background radiation Cold dark matter Dark matter Galactic evolution Galaxies Gamma ray absorption Gamma ray bursts Gamma rays Near infrared radiation Star & galaxy formation Star formation Stellar evolution |
| title | Probing the Era of Galaxy Formation via TeV Gamma Ray Absorption by the Near Infrared Extragalactic Background |
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