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Why Have Many of the Brightest Radio-loud Blazars Not Been Detected in Gamma-Rays by Fermi?

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Why Have Many of the Brightest Radio-loud Blazars Not Been Detected in Gamma-Rays by Fermi?

dc.contributor.author	Lister, Matthiew L.
dc.contributor.author	Aller, M. F.
dc.contributor.author	Aller, H. D.
dc.contributor.author	Hovatta, Talvikki
dc.contributor.author	Max-Moerbeck, W.
dc.contributor.author	Readhead, A. C. S.
dc.contributor.author	Richards, J. L.
dc.contributor.author	Ros Ibarra, Eduardo
dc.date.accessioned	2017-07-03T16:11:12Z
dc.date.available	2017-07-03T16:11:12Z
dc.date.issued	2015
dc.identifier.citation	Lister, M. L. Aller, M. F. Aller, H. D. Hovatta, Talvikki Max-Moerbeck, W. Readhead, A. C. S. Richards, J. L. Ros Ibarra, Eduardo 2015 Why Have Many of the Brightest Radio-loud Blazars Not Been Detected in Gamma-Rays by Fermi? Astrophysical Journal Letters 810 L9 1 6
dc.identifier.uri	http://hdl.handle.net/10550/59324
dc.description.abstract	We use the complete MOJAVE 1.5 Jy sample of active galactic nuclei (AGN) to examine the gamma-ray detection statistics of the brightest radio-loud blazars in the northern sky. We find that 23% of these AGN were not detected above 0.1 GeV by the Fermi LAT during the 4-year 3FGL catalog period partly because of an instrumental selection effect, and partly due to their lower Doppler boosting factors. Blazars with synchrotron peaks in their spectral energy distributions located below 10^13.4 Hz also tend to have high-energy peaks that lie below the 0.1 GeV threshold of the LAT, and are thus less likely to be detected by Fermi. The non-detected AGN in the 1.5 Jy sample also have significantly lower 15 GHz radio modulation indices and apparent jet speeds, indicating that they have lower than average Doppler factors. Since the effective amount of relativistic Doppler boosting is enhanced in gamma-rays (particularly in the case of external inverse-Compton scattering), this makes them less likely to appear in the 3FGL catalog. Based on their observed properties, we have identified several bright radio-selected blazars that are strong candidates for future detection by Fermi.
dc.language.iso	eng
dc.relation.ispartof	Astrophysical Journal Letters, 2015, vol. 810, num. L9, p. 1-6
dc.subject	Astrofísica
dc.subject	Astronomia
dc.title	Why Have Many of the Brightest Radio-loud Blazars Not Been Detected in Gamma-Rays by Fermi?
dc.type	journal article	es_ES
dc.date.updated	2017-07-03T16:11:13Z
dc.identifier.doi	10.1088/2041-8205/810/1/L9
dc.identifier.idgrec	108954
dc.rights.accessRights	open access	es_ES