Radio and Gamma-ray Properties of Extragalactic Jets from the TANAMI Sample

Abstract

Using high-resolution radio imaging with VLBI techniques, the TANAMI program has been observing the parsec-scale radio jets of southern (declination south of -30°) gamma-ray bright AGN simultaneously with Fermi/LAT monitoring of their gamma-ray emission. We present the radio and gamma-ray properties 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 gamma-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 gamma-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 gamma-ray and radio luminosities are related by $L_{\gamma }\propto L_r^{0.89+-0.04}$. The brightness temperatures of the radio cores increase with the average gamma-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 gamma/radio luminosity ratios and lower contemporaneous brightness temperatures. Unless the Fermi/LAT-undetected blazars are strongly gamma-ray-fainter than the Fermi/LAT-detected ones, their gamma-ray luminosity should not be significantly lower than the upper limits calculated here.

12 pages, 11 figures, 3 tables, Accepted for publication in Astronomy & Astrophysics

References in corpus (15)

• The Third Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• Roma-BZCAT: A multifrequency catalogue of Blazars
• CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates
• Fermi Gamma-ray Imaging of a Radio Galaxy
• Relativistic Beaming and the Intrinsic Properties of Extragalactic Radio Jets
• On the relation between AGN gamma-ray emission and parsec-scale radio jets
• Radio/gamma-ray time delay in the parsec-scale cores of active galactic nuclei
• TANAMI monitoring of Centaurus A: The complex dynamics in the inner parsec of an extragalactic jet
• Spectroscopy of High Energy BL Lac Objects with X-shooter on the VLT
• The AuScope Geodetic VLBI Array
• Characteristics of EGRET Blazars in the VLBA Imaging and Polarimetry Survey (VIPS)
• The Radio to Gamma Ray Connection of EGRET Blazars: Correlation, Regression and Monte Carlo Analysis
• Evolution of the pc-scale structure of PKS 1934-638 revisited: first science with the ASKAP and New Zealand telescopes
• Stability Analysis of Slotted Aloha with Opportunistic RF Energy Harvesting
• Blazar Demographics with MOJAVE and GLAST

Cited by in corpus (10)

• The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• Gamma-ray emission in radio galaxies under the VLBI scope -- I. Parsec-scale kinematics and high-energy properties of $\gamma$-ray detected TANAMI radio galaxies
• The TANAMI Multiwavelength Program: Dynamic SEDs of Southern Blazars
• The relationship between the radio core-dominance parameter and spectral index in different classes of extragalactic radio sources (III)
• TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources
• The Powerful Jet and Gamma-Ray Flare of the Quasar PKS 0438$-$436
• TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry. III. First-epoch S band images
• Exploring the bulk of the BL Lac object population. II. Gamma-ray properties
• Dissipative processes and their role in the evolution of radio galaxies
• Multiwavelength and parsec-scale properties of extragalactic jets