TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources
TANAMI is a multiwavelength program monitoring active galactic nuclei (AGN) south of -30deg declination including high-resolution Very Long Baseline Interferometry (VLBI) imaging, radio, optical/UV, X-ray and gamma-ray studies. We have previously published first-epoch 8.4GHz VLBI images of the parse...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
EDP Sciences
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/57677 |
| _version_ | 1848760067989438464 |
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| author | Müller, C. Kadler, M. Ojha, R. Schulz, R. Trüstedt, J. Edwards, P. Ros, E. Carpenter, B. Angioni, R. Blanchard, J. Böck, M. Burd, P. Dörr, M. Dutka, M. Eberl, T. Gulyaev, S. Hase, H. Horiuchi, S. Katz, U. Krauß, F. Lovell, J. Natusch, T. Nesci, R. Phillips, C. Plötz, C. Pursimo, T. Quick, J. Stevens, J. Thompson, D. Tingay, Steven Tzioumis, A. Weston, S. Wilms, J. Zensus, J. |
| author_facet | Müller, C. Kadler, M. Ojha, R. Schulz, R. Trüstedt, J. Edwards, P. Ros, E. Carpenter, B. Angioni, R. Blanchard, J. Böck, M. Burd, P. Dörr, M. Dutka, M. Eberl, T. Gulyaev, S. Hase, H. Horiuchi, S. Katz, U. Krauß, F. Lovell, J. Natusch, T. Nesci, R. Phillips, C. Plötz, C. Pursimo, T. Quick, J. Stevens, J. Thompson, D. Tingay, Steven Tzioumis, A. Weston, S. Wilms, J. Zensus, J. |
| author_sort | Müller, C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | TANAMI is a multiwavelength program monitoring active galactic nuclei (AGN) south of -30deg declination including high-resolution Very Long Baseline Interferometry (VLBI) imaging, radio, optical/UV, X-ray and gamma-ray studies. We have previously published first-epoch 8.4GHz VLBI images of the parsec-scale structure of the initial sample. In this paper, we present images of 39 additional sources. The full sample comprises most of the radio- and gamma-ray brightest AGN in the southern quarter of the sky, overlapping with the region from which high-energy (>100TeV) neutrino events have been found. We characterize the parsec-scale radio properties of the jets and compare with the quasi-simultaneous Fermi/LAT gamma-ray data. Furthermore, we study the jet properties of sources which are in positional coincidence with high-energy neutrino events as compared to the full sample. We test the positional agreement of high-energy neutrino events with various AGN samples. Our observations yield the first images of many jets below -30deg declination at milliarcsecond resolution. We find that gamma-ray loud TANAMI sources tend to be more compact on parsec-scales and have higher core brightness temperatures than gamma-ray faint jets, indicating higher Doppler factors. No significant structural difference is found between sources in positional coincidence with high-energy neutrino events and other TANAMI jets. The 22 gamma-ray brightest AGN in the TANAMI sky show only a weak positional agreement with high-energy neutrinos demonstrating that the >100TeV IceCube signal is not simply dominated by a small number of the $\gamma$-ray brightest blazars. Instead, a larger number of sources have to contribute to the signal with each individual source having only a small Poisson probability for producing an event in multi-year integrations of current neutrino detectors. |
| first_indexed | 2025-11-14T10:09:53Z |
| format | Journal Article |
| id | curtin-20.500.11937-57677 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:09:53Z |
| publishDate | 2018 |
| publisher | EDP Sciences |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-576772018-04-30T04:33:16Z TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources Müller, C. Kadler, M. Ojha, R. Schulz, R. Trüstedt, J. Edwards, P. Ros, E. Carpenter, B. Angioni, R. Blanchard, J. Böck, M. Burd, P. Dörr, M. Dutka, M. Eberl, T. Gulyaev, S. Hase, H. Horiuchi, S. Katz, U. Krauß, F. Lovell, J. Natusch, T. Nesci, R. Phillips, C. Plötz, C. Pursimo, T. Quick, J. Stevens, J. Thompson, D. Tingay, Steven Tzioumis, A. Weston, S. Wilms, J. Zensus, J. TANAMI is a multiwavelength program monitoring active galactic nuclei (AGN) south of -30deg declination including high-resolution Very Long Baseline Interferometry (VLBI) imaging, radio, optical/UV, X-ray and gamma-ray studies. We have previously published first-epoch 8.4GHz VLBI images of the parsec-scale structure of the initial sample. In this paper, we present images of 39 additional sources. The full sample comprises most of the radio- and gamma-ray brightest AGN in the southern quarter of the sky, overlapping with the region from which high-energy (>100TeV) neutrino events have been found. We characterize the parsec-scale radio properties of the jets and compare with the quasi-simultaneous Fermi/LAT gamma-ray data. Furthermore, we study the jet properties of sources which are in positional coincidence with high-energy neutrino events as compared to the full sample. We test the positional agreement of high-energy neutrino events with various AGN samples. Our observations yield the first images of many jets below -30deg declination at milliarcsecond resolution. We find that gamma-ray loud TANAMI sources tend to be more compact on parsec-scales and have higher core brightness temperatures than gamma-ray faint jets, indicating higher Doppler factors. No significant structural difference is found between sources in positional coincidence with high-energy neutrino events and other TANAMI jets. The 22 gamma-ray brightest AGN in the TANAMI sky show only a weak positional agreement with high-energy neutrinos demonstrating that the >100TeV IceCube signal is not simply dominated by a small number of the $\gamma$-ray brightest blazars. Instead, a larger number of sources have to contribute to the signal with each individual source having only a small Poisson probability for producing an event in multi-year integrations of current neutrino detectors. 2018 Journal Article http://hdl.handle.net/20.500.11937/57677 10.1051/0004-6361/201731455 EDP Sciences fulltext |
| spellingShingle | Müller, C. Kadler, M. Ojha, R. Schulz, R. Trüstedt, J. Edwards, P. Ros, E. Carpenter, B. Angioni, R. Blanchard, J. Böck, M. Burd, P. Dörr, M. Dutka, M. Eberl, T. Gulyaev, S. Hase, H. Horiuchi, S. Katz, U. Krauß, F. Lovell, J. Natusch, T. Nesci, R. Phillips, C. Plötz, C. Pursimo, T. Quick, J. Stevens, J. Thompson, D. Tingay, Steven Tzioumis, A. Weston, S. Wilms, J. Zensus, J. TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources |
| title | TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources |
| title_full | TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources |
| title_fullStr | TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources |
| title_full_unstemmed | TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources |
| title_short | TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources |
| title_sort | tanami: tracking active galactic nuclei with austral milliarcsecond interferometry - ii. additional sources |
| url | http://hdl.handle.net/20.500.11937/57677 |