GMVA25B-348
mm-VLBI monitoring of TeV-emitting AGN
Abstract
We are currently at the dawn of a new era in high-energy astrophysics. While current imaging air Cherenkov telescopes (MAGIC, H.E.S.S. and VERITAS) have already detected ~90 Active Galactic Nulei (AGN) at TeV-gamma rays, in the near future the upcoming Cherenkov Telescope Array Observatory (CTAO) will enable studies in the range from tens of GeV up to hundreds of TeV. Moreover, a tentative picture is emerging in which very-high-energy neutrino emission might be characteristically associated with radio flares in compact AGN.
We are proposing a long-term monitoring program with the GMVA at 86 GHz, dedicated to TeV-emitting AGN. With the unprecedented resolution of the GMVA (incl. improved North-South resolution with APEX and GLT), as well as its superior sensitivity (due to NOEMA, Pico Veleta and Effelsberg) we want to probe the smallest-scale jet structure close to the mm-core of these sources and investigate their structural variability over 1.5 years. Our program targets the 17 radio-brightest TeV-detected AGN (Dec >-30deg), which are prime targets to study possible changes in the jet structure due to their brightness and proximity. Using single-dish monitoring data in combination with the VLBI data, we want to constrain the location of the TeV-gamma-ray emission sites.
Investigators
| Name | Institution |
|---|---|
| Florian Eppel * | Joint Institute for Very Long Baseline Interferometry European Research Infrastructure Consortium |
| Matthias Kadler | Wurzburg, Julius-Maximilians-Universitat |
| Luca Ricci | Max-Planck-Institut für Radioastronomie; Wurzburg, Julius-Maximilians-Universitat |
| Jonas Hessdoerfer | Würzburg, Universität; Wurzburg, Julius-Maximilians-Universitat |
| Florian Roesch | Würzburg, Universität |
| Eduardo Ros | Max-Planck-Institut für Radioastronomie; València, Universitat de |
| Daniela Dorner | Würzburg, Universität |
| Georgios Filippos Paraschos | Max-Planck-Institut für Radioastronomie; Turku, University of; Finnish Centre for Astronomy with ESO |
| Thomas Krichbaum | Max-Planck-Institut für Radioastronomie |
| Sanghyun Kim | Korea Astronomy and Space Science Institute |
| Christan Fromm | Max-Planck-Institut für Radioastronomie; Frankfurt am Main, Goethe-Universität; Wurzburg, Julius-Maximilians-Universitat |
| Michael Zacharias | Paris, Observatoire de |
| Marcello Giroletti | Istituto Nazionale di Astrofisica |
| Andrea Gokus | Washington University in St. Louis |
| Olivier Hervet | California at Santa Cruz, University of |
| Julian Sitarek | Uniwersytet Lódzki |
| GBT Operator | Green Bank Observatory |
* indicates the PI