GeV observations of star-forming galaxies with the fermi large area telescope
Recent detections of the starburst galaxies M82 and NGC253 by gamma-ray telescopes suggest that galaxies rapidly forming massive stars are more luminous at gamma-ray energies compared to their quiescent relatives. Building upon those results, we examine a sample of 69 dwarf, spiral, and luminous and...
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2012
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v755_n2_p_Ackermann http://hdl.handle.net/20.500.12110/paper_0004637X_v755_n2_p_Ackermann |
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paper:paper_0004637X_v755_n2_p_Ackermann2023-06-08T14:29:07Z GeV observations of star-forming galaxies with the fermi large area telescope cosmic rays galaxies: starburst gamma rays: diffuse background gamma rays: galaxies Recent detections of the starburst galaxies M82 and NGC253 by gamma-ray telescopes suggest that galaxies rapidly forming massive stars are more luminous at gamma-ray energies compared to their quiescent relatives. Building upon those results, we examine a sample of 69 dwarf, spiral, and luminous and ultraluminous infrared galaxies at photon energies 0.1-100 GeV using 3years of data collected by the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (Fermi). Measured fluxes from significantly detected sources and flux upper limits for the remaining galaxies are used to explore the physics of cosmic rays in galaxies. We find further evidence for quasi-linear scaling relations between gamma-ray luminosity and both radio continuum luminosity and total infrared luminosity which apply both to quiescent galaxies of the Local Group and low-redshift starburst galaxies (conservative P-values ≲ 0.05 accounting for statistical and systematic uncertainties). The normalizations of these scaling relations correspond to luminosity ratios of log (L 0.1-100 GeV /L 1.4 GHz ) = 1.7 ± 0.1 (statistical) ± 0.2 (dispersion) and log (L 0.1-100 GeV /L 8-1000 μm ) = -4.3 ± 0.1 (statistical) ± 0.2 (dispersion) for a galaxy with a star formation rate of 1 M yr -1 , assuming a Chabrier initial mass function. Using the relationship between infrared luminosity and gamma-ray luminosity, the collective intensity of unresolved star-forming galaxies at redshifts 0 < z < 2.5 above 0.1 GeV is estimated to be 0.4-2.4 × 10 -6 ph cm -2 s -1 sr -1 (4%-23% of the intensity of the isotropic diffuse component measured with the LAT). We anticipate that 10 galaxies could be detected by their cosmic-ray-induced gamma-ray emission during a 10 year Fermi mission. © 2012. The American Astronomical Society. All rights reserved. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v755_n2_p_Ackermann http://hdl.handle.net/20.500.12110/paper_0004637X_v755_n2_p_Ackermann |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
cosmic rays galaxies: starburst gamma rays: diffuse background gamma rays: galaxies |
| spellingShingle |
cosmic rays galaxies: starburst gamma rays: diffuse background gamma rays: galaxies GeV observations of star-forming galaxies with the fermi large area telescope |
| topic_facet |
cosmic rays galaxies: starburst gamma rays: diffuse background gamma rays: galaxies |
| description |
Recent detections of the starburst galaxies M82 and NGC253 by gamma-ray telescopes suggest that galaxies rapidly forming massive stars are more luminous at gamma-ray energies compared to their quiescent relatives. Building upon those results, we examine a sample of 69 dwarf, spiral, and luminous and ultraluminous infrared galaxies at photon energies 0.1-100 GeV using 3years of data collected by the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (Fermi). Measured fluxes from significantly detected sources and flux upper limits for the remaining galaxies are used to explore the physics of cosmic rays in galaxies. We find further evidence for quasi-linear scaling relations between gamma-ray luminosity and both radio continuum luminosity and total infrared luminosity which apply both to quiescent galaxies of the Local Group and low-redshift starburst galaxies (conservative P-values ≲ 0.05 accounting for statistical and systematic uncertainties). The normalizations of these scaling relations correspond to luminosity ratios of log (L 0.1-100 GeV /L 1.4 GHz ) = 1.7 ± 0.1 (statistical) ± 0.2 (dispersion) and log (L 0.1-100 GeV /L 8-1000 μm ) = -4.3 ± 0.1 (statistical) ± 0.2 (dispersion) for a galaxy with a star formation rate of 1 M yr -1 , assuming a Chabrier initial mass function. Using the relationship between infrared luminosity and gamma-ray luminosity, the collective intensity of unresolved star-forming galaxies at redshifts 0 < z < 2.5 above 0.1 GeV is estimated to be 0.4-2.4 × 10 -6 ph cm -2 s -1 sr -1 (4%-23% of the intensity of the isotropic diffuse component measured with the LAT). We anticipate that 10 galaxies could be detected by their cosmic-ray-induced gamma-ray emission during a 10 year Fermi mission. © 2012. The American Astronomical Society. All rights reserved. |
| title |
GeV observations of star-forming galaxies with the fermi large area telescope |
| title_short |
GeV observations of star-forming galaxies with the fermi large area telescope |
| title_full |
GeV observations of star-forming galaxies with the fermi large area telescope |
| title_fullStr |
GeV observations of star-forming galaxies with the fermi large area telescope |
| title_full_unstemmed |
GeV observations of star-forming galaxies with the fermi large area telescope |
| title_sort |
gev observations of star-forming galaxies with the fermi large area telescope |
| publishDate |
2012 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v755_n2_p_Ackermann http://hdl.handle.net/20.500.12110/paper_0004637X_v755_n2_p_Ackermann |
| _version_ |
1768543209120595968 |