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Title: Radio and gamma-ray properties of extragalactic jets from the TANAMI sample

Journal Article · · Astronomy and Astrophysics

The TANAMI program has been observing parsec-scale radio jets of southern (declination south of - 30°) γ-ray bright AGN, simultaneously with Fermi/LAT monitoring of their γ-ray emission, via high-resolution radio imaging with Very Long Baseline Interferometry techniques. In this paper, we present the radio and γ-rayproperties of the TANAMI sources based on one year of contemporaneous TANAMI and Fermi/LAT data. A large fraction (72%) of the TANAMI sample can be associated with bright γ-ray sources for this time range. Association rates differ for different optical classes with all BL Lacs, 76% of quasars, and just 17% of galaxies detected by the LAT. Upper limits were established on the γ-ray flux from TANAMI sources not detected by LAT. This analysis led to the identification of three new Fermi sources whose detection was later confirmed. The γ-ray and radio luminosities are related by Lγ ∝ Lr0.89±0.04. The brightness temperatures of the radio cores increase with the average γ-ray luminosity and the presence of brightness temperatures above the inverse Compton limit implies strong Doppler boosting in those sources. The undetected sources have lower γ/radio luminosity ratios and lower contemporaneous brightness temperatures. Finally, unless the Fermi/LAT-undetected blazars are much γ-ray-fainter than the Fermi/LAT-detected sources, their γ-ray luminosity should not be significantly lower than the upper limits calculated here.

Research Organization:
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA); Federal Ministry for Economic Affairs and Energy (BMWi) (Germany); Ministry of Economy, Industry and Competitiveness (MINECO) (Spain); Generalitat Valenciana; European Cooperation in Science and Technology (COST) (Belgium)
Contributing Organization:
Fermi LAT Collaboration
Grant/Contract Number:
AC02-76SF00515; NNH09ZDA001N; NNH10ZDA001N; 50OR0808; AYA2009-13036-C02-C02; AYA2012-38491-C02-01; Prometeo 2009/104; MP0905
OSTI ID:
1355699
Journal Information:
Astronomy and Astrophysics, Vol. 590; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (8)

The TANAMI Multiwavelength Program: Dynamic spectral energy distributions of southern blazars journal June 2016
TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry: II. Additional sources journal February 2018
Exploring the bulk of the BL Lacertae object population: II. Gamma-ray properties journal October 2018
Gamma-ray emission in radio galaxies under the VLBI scope: I. Parsec-scale jet kinematics and high-energy properties of journal July 2019
Dissipative Processes and Their Role in the Evolution of Radio Galaxies journal July 2019
The Powerful Jet and Gamma-Ray Flare of the Quasar PKS 0438–436 journal December 2018
Mid-infared Light Curve and High-resolution Radio Structure of the Candidate Neutrino Source GB6 J1040+0617 journal February 2019
Exploring the bulk of the BL Lac object population. II. Gamma-ray properties text January 2018

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