First-Epoch VLBA Imaging of Twenty New TeV Blazars
B. Glenn Piner, Philip G. Edwards

TL;DR
This paper presents the first high-resolution VLBA images of 20 TeV blazars, revealing their parsec-scale jet structures, brightness temperatures, and potential correlations with gamma-ray emissions, advancing understanding of their jet physics.
Contribution
First VLBA imaging campaign of 20 TeV blazars, providing new high-resolution data on their jet structures and brightness temperatures, and analyzing their flux correlations with gamma-ray emissions.
Findings
All sources show parsec-scale jet structures.
Brightness temperatures are around 2x10^10 K, not requiring strong relativistic beaming.
Marginal correlation between VLBI and TeV fluxes in the full sample.
Abstract
We present Very Long Baseline Array (VLBA) images of 20 TeV blazars (HBLs) not previously well-studied on the parsec scale. Observations were made between August and December 2013, at a frequency of 8.4 GHz. These observations represent the first epoch of a VLBA monitoring campaign on these blazars, and they significantly increase the fraction of TeV HBLs studied with high-resolution imaging. The peak VLBI flux densities of these sources range from about 10 to 100 mJy/beam, and parsec-scale jet structure is detected in all sources. About half of the VLBI cores are resolved, with brightness temperature upper limits of a few times 10^10 K, and we find that a brightness temperature of about 2x10^10 K is consistent with the VLBI data for all but one of the sources. Such brightness temperatures do not require any relativistic beaming to reduce the observed value below commonly invoked…
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