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Centro de Astrofísica da Universidade do Porto

The radio properties of the cD galaxy of Abell 2390

P. Augusto, A. C. Edge, C. J. Chandler

We present multifrequency, multi-epoch radio imaging of the complex radio source B2151+174 in the core of the cluster, Abell 2390 (z < 0.23). From new and literature data, we conclude that the Faranoff´┐ŻRiley type II (FRII)-powerful radio source is the combination of a compact, core-dominated ´┐Żmedium-sized symmetric object´┐Ż (MSO) with a more extended, steeper spectrum mini-halo. B2151+174 is unusual in a number of important aspects. (i) It is one of the most compact and flat spectrum sources in a cluster core known; (ii) it shows a complex, compact twin-jet structure in a north´┐Żsouth orientation; (iii) the orientation of the jets is 45◦ misaligned with apparent structure (ionization cones and dust disc) of the host galaxy on larger scales. Since the twin-jet of the MSO has its northern half with an apparent ´┐Żtwist´┐Ż, it might be that precession of the central supermassive black hole explains this misalignment. B2151+174 may be an example of the early stage (103´┐Ż104 yr duration) of a ´┐Żbubble´┐Ż being blown into the intracluster medium where the plasma has yet to expand.

Monthly Notices of the Royal Astronomical Society
Volume 367, Page 366
January 2006

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Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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