Undersökning av radiogalaxer i kartläggningen XXL-North

Sammanfattning: This report aims at investigating two newly discovered radio galaxies in a 47 deg2 region of the skylabeled XXL-North. In the first step, a sensitive, high angular resolution radio map obtained withthe Giant Meterwave Radio Telescope in India is scanned for interesting radio galaxies; in the secondstep, two of the found radio galaxies are analyzed in detail and additional data at radio frequenciesand in other parts of the electromagnetic spectrum (X-ray, optical) are used. The spectral fluxdensities, spectral indices and spectral luminosities of the two radio galaxies are computed andrelated to their morphology. The host galaxies are identified and their redshifts and distancesare established. Both have the same redshift z ' 0.14. The extents of the radio structures are,respectively, 35300 and 18000, which amounts to projected sizes of 850 kpc and 439 kpc, respectively.The derived luminosities are, respectively, (1.27 ± 0.13) · 1025 W Hz−1 and (6.30 ± 0.63) · 1024 WHz−1. These are reasonable luminosity values for radio galaxies of morphological class FR II. Theirstructural appearance, with lobes containing distinct hot spots, supports this classification.