ATNF Daily Astronomy Picture

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3rd of April 2015
Giant radio galaxies - Tracers of large-scale structure
by Jurek Malarecki (ICRAR/UWA)
The contours of this image show the giant radio galaxy B0511-305 as imaged by the Compact Array at 2.1 GHz. The lobes of this radio galaxy extend well over 1 Mpc, making this object a true giant of the Universe. Galaxies with recession velocities within 900 km/s of the host galaxy (redshift z=0.0577) are shown as blue crosses; foreground galaxies are marked with blue triangles and background galaxies with magenta dots. The redshifts are from the AAOmega spectrograph on the Anglo-Australian Telescope. The observations are part of a study of the interaction between the lobes of 19 giant radio galaxies and the Warm-Hot Intergalactic Medium (WHIM). The results indicate that giant radio lobes are preferentially found to propagate towards regions of lower galaxy density. For more details, see Malarecki et al. (2013) and Malarecki et al. (2015).

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