![topcat astronomy topcat astronomy](https://www.cosmos.esa.int/documents/401090/442498/esasky_galaxy_list.png)
For the detected sources we obtain an average brightness temperature on the order of 2 × 10 10 K. The vast majority of the detected sources are radio weak, with a median VLBI flux density value of 16.3 mJy. For ~93% of the sources in our sample we reveal a compact high brightness temperature radio core, which supports their proposed blazar association. For those sources without a well-identified radio counterpart we exploit the VLBA multiple phase-center correlation capability to identify the possible low-frequency candidates. These sources lack high-resolution radio observations and have at least one NRAO VLA sky survey counterpart within the 95% confidence radius. We observed 84 1FHL sources, mostly blazars of high synchrotron peaked (HSP) type, in the northern sky with the Very Long Baseline Array (VLBA) at 5 GHz. Moreover, we increase the number of 1FHL sources with high-resolution observations to explore the possible connection between radio and γ rays at E> 10 GeV.
#Topcat astronomy Pc
We investigate the pc scale properties of a subsample of radio faint 1FHL sources with the aim of confirming the proposed blazar associations by revealing a compact high brightness temperature radio core, and we propose new low-frequency counterparts for the unassociated γ-ray sources (UGS). The first Fermi-LAT high-energy source catalog (1FHL), containing γ-ray sources detected above 10 GeV, is an ideal sample for characterizing the physical properties of the most extreme γ-ray sources.Īims. D’Ammando 1 ,2ġ INAF Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, ItalyĮ-mail: Dipartimento di Fisica e Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, ItalyĬontext.
![topcat astronomy topcat astronomy](http://www.star.bris.ac.uk/~mbt/topcat/figures/GangLayerControl_area.png)
This event was held on Octowith the aim of improving information security skills and tools. At a regular scheduled educational seminar the Top Cat Rating team discussed theoretical foundations, features and practice of applying the European General Data Protection Regulation (GDPR).