Our results establish that the distributions of the radio spectral index and the black hole mass of GRGs do not differ from the corresponding distributions of normal-sized radio galaxies (RGs). This provides new insights into their nature. For the first time, we present the multi-wavelength properties of the largest sample of GRGs. As part of the project SAGAN, we have created a database of all known GRGs, the GRG catalogue, from the literature (including our new sample) it includes 820 sources. We have identified 162 new GRGs primarily from the NRAO VLA Sky Survey with sizes ranging from ∼0.71 Mpc to ∼2.82 Mpc in the redshift range of ∼0.03−0.95, of which 23 are hosted by quasars (giant radio quasars). We present the first results of a project called SAGAN, which is dedicated solely to the studies of relatively rare megaparsec-scale radio galaxies in the Universe, called giant radio galaxies (GRGs). Lyon, ENS de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon, 69230 Saint-Genis-Laval, France Max-Planck-Institut für Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germanyĭepartment of Physics, Presidency University, 86/1 College Street, Kolkata 700073, Indiaĭiscipline of Astronomy, Astrophysics and Space Engineering, Indian Institute of Technology Indore, Indore 453552, India ![]() Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, PR Chinaĭepartment of Astronomy, School of Physics, Peking University, Beijing 100871, PR China ![]() National Centre for Radio Astrophysics, TIFR, Post Bag 3, Ganeshkhind, Pune 411007, India Homi Bhabha Road, Pashan, Pune 411008, India Indian Institute of Science Education and Research (IISER), Dr. Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, 75014 Paris, FranceĬollège de France, 11 Place Marcelin Berthelot, 75231 Paris, France Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The NetherlandsĮ-mail: Centre for Astronomy and Astrophysics (IUCAA), Pune 411007, India
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