Relation Between Events In The Millimeter-wave Core And Gamma-ray Outbursts In Blazars

Details Relation Between Events In The Millimeter-wave Core And Gamma-ray Outbursts In Blazars Relation Between Events In The Millimeter-wave Core And Gamma-ray Outbursts In Blazars

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915429j&link_type=abstract

American Astronomical Society, AAS Meeting #219, #154.29

Astronomy and Astrophysics

Astronomy

Scientific paper

We report results from our program of monitoring 33 gamma-ray detected blazars with the VLBA at 43 GHz. We identify superluminal knots in the jets and determine the epochs when the knots pass through the mm-wave core (the ejection time). We construct a gamma-ray light for each source using photon and spacecraft data provided by the Fermi LAT and identify sources with gamma-ray flares. Comparison of ejection times with times of gamma-ray flares reveals different relations between gamma-ray events and disturbances in the parsec-scale jet: i) a number of γ-ray flares and ejections are simultaneous within the uncertainties (e.g., 3C 273, 3C 454.3. PKS1510-089); ii) several blazars show brightening of the core at mm wavelengths during a gamma-ray flare without the appearance of a new knot (e.g., CTA102); iii) some gamma-ray flares occur after passage of a knot through the core (e.g. 0235+164), and vice-versa; iv) a fraction of the blazars show little or no relation between mm-wave and gamma-ray events. The gamma-ray emission therefore appears to occur in multiple sites in different blazars, and sometimes within a given object. This conclusion has important implications regarding the
inference of the physical conditions under which high-energy emission occurs in the relativistic jets of blazars.
This research was supported in part by NASA grants NNX08AV65G, NNX08AV61G, NNX09AT99G, NNX09AU10G, NNX10AO59G, and NNX11AQ03G, and by NSF grant AST-0907893.

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