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Centro de Astrofísica da Universidade do Porto

A project to constrain emission from giant gaseous shells around high redshift radio galaxies

M. M. Moyano, A. Humphrey, D. C. Merlo

Around half of the radio galaxies (radio-loud, type 2 quasars) at 2 are known to show strong Ly absorption features in their spectra, with a spatial extent at least as large as the background Ly nebulae closely associated with the AGN host galaxy ( 10-100 kpc). Based on their observed properties to date, these absorbers are thought to be large-scale shells of gas surrounding the host galaxy and its Ly halo. Their origin is unclear, but is likely related to feedback processes in the host galaxy. In this work, we discuss our ongoing study of these absorbing shells using archival Hubble Space Telescope (HST) images of the rest-frame UV emission of 2.5 radio galaxies in order to search for these shells in emission, or to place constraints on their emission luminosity.

Boletín de la Asociación Argentina de Astronomía
(Eds.) A. Rovero, C. Beaugé

Asociación Argentina de Astronomía
Vol. 57, Page 12

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Institute of Astrophysics and Space Sciences

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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