J/A+A/610/A1 TANAMI II. Additional sources (Mueller+, 2018)
TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond
Interferometry. II. Additional sources
Mueller C., Kadler M., Ojha R., Schulz R., Truestedt J., Edwards P.G.,
Ros E., Carpenter B., Angioni R., Blanchard J., Boeck M., Burd P.R.,
Doerr M., Dutka M.S., Eberl T., Gulyaev S., Hase H., Horiuchi S.,
Katz U., Krauss F., Lovell J.E.J., Natusch T., Nesci R., Phillips C.,
Ploetz C., Pursimo T., Quick J.F.H., Stevens J., Thompson D.J.,
Tingay S.J., Tzioumis A.K., Weston S., Wilms J., Zensus J.A.
<Astron. Astrophys. 610, A1 (2018)>
=2018A&A...610A...1M 2018A&A...610A...1M (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; VLBI
Keywords: galaxies: active - galaxies: jets - galaxies: nuclei -
radio continuum: galaxies - techniques: high angular resolution -
neutrinos
Abstract:
TANAMI is a multiwavelength program monitoring active galactic nuclei
(AGN) south of -30° declination including high-resolution Very
Long Baseline Interferometry (VLBI) imaging, radio, optical/UV, X-ray
and γ-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 γ-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 γ-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.
TANAMI VLBI observations at 8.4GHz are made with Southern-Hemisphere
radio telescopes located in Australia, Antarctica, Chile, New Zealand,
and South Africa.
Our observations yield the first images of many jets below -30°
declination at milliarcsecond resolution. We find that γ-ray
loud TANAMI sources tend to be more compact on parsec-scales and have
higher core brightness temperatures than γ-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 γ-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 γ-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.
Description:
Very Long Baseline Interferometry (VLBI) images of 39 active galactic
nuclei from the TANAMI sample (Figs. 1-5). TANAMI VLBI observations at
8.4 GHz are made with southern hemisphere radio telescopes located in
Australia, Antarctica, Chile, New Zealand, and South Africa.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 102 39 List of FITS images
fits/* . 39 Individual VLBI FITS images of 39 sources at 8.4GHz
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See also:
J/A+A/591/A130 : Dynamic SEDs of southern blazars - DSSB (Krauss+, 2016)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension of center (J2000)
11- 19 F9.5 deg DEdeg Declination of center (J2000)
21- 24 F4.2 mas/pix Scale Scale of the image
26- 29 I4 --- Nx Number of pixels along X-axis
30 A1 --- --- [x]
31- 34 I4 --- Ny Number of pixels along Y-axis
36- 42 F7.5 GHz Freq Frequency
44- 53 A10 "YYYY-MM-DD" ObsDate Observation date
55- 59 I5 Kibyte size Size of FITS file
61- 74 A14 --- FileName Name of FITS file in subdirectory fits
76-102 A27 --- Title Title of the file
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Acknowledgements:
Cornelia Mueller, c.mueller(at)astro.ru.nl
References:
Krauss et al., Paper I 2016A&A...591A.130K 2016A&A...591A.130K, Cat. J/A+A/591/A130
(End) Patricia Vannier [CDS] 22-Sep-2017