Results 21 to 30 of about 1,075,291 (208)

LARGE-SCALE RADIO STRUCTURE IN THE UNIVERSE: GIANT RADIO GALAXIES [PDF]

Multiwavelength AGN Surveys, 2004
Giant radio galaxies (GRGs), with linear sizes larger than 1 Mpc (H0=50 km/s/Mpc), represent the biggest single objects in the Universe. GRGs are rare among the entire population of radio galaxies (RGs) and their physical evolution is not well understood though for many years they have been of special interest for several reasons.
Jamrozy, Marek, Klein, U., Machalski, Jerzy, Mack, K.-H.   +3 more
openaire   +3 more sources

Radio Mode Outbursts in Giant Elliptical Galaxies [PDF]

AIP Conference Proceedings, 2009
4 pages, 3 figures, to appear in proceedings of "The Monster's Fiery Breath", Eds. Sebastian Heinz & Eric Wilcots (AIP conference series)
Paul Nulsen, Christine Jones, William Forman, Eugene Churazov, Brian McNamara, Laurence David, Stephen Murray, Sebastian Heinz, Eric Wilcots   +8 more
openaire   +3 more sources

Feeding the Central Engine in Giant Radio Galaxies [PDF]

Symposium - International Astronomical Union, 1999
Giant radio galaxies are thought to be massive ellipticals powered by accretion of interstellar matter onto a supermassive black hole. Interactions with gas rich galaxies may provide the interstellar matter to feed the active galactic nucleus (AGN). To power radio lobes that extend up to distances of hundreds of kiloparsecs, gas has to be funneled from
Mirabel, I. F., Laurent, O.
openaire   +2 more sources

General Properties of Giant Radio Galaxies [PDF]

Symposium - International Astronomical Union, 1996
So far, the number of so-called giant radio galaxies (GRGs) is small. We define them as radio sources with linear sizes larger than 1 Mpc (H0 = 75 km s–1 Mpc–1). On-going low-frequency surveys may come up with many more candidates for this species. Their very existence may ultimately be connected with their environment.
U. Klein, K.-H. Mack, L. Saripalli
openaire   +1 more source

Discovery of a Giant Radio Fossil in the Ophiuchus Galaxy Cluster [PDF]

The Astrophysical Journal, 2020
Abstract The Ophiuchus galaxy cluster exhibits a curious concave gas density discontinuity at the edge of its cool core. It was discovered in the Chandra X-ray image by Werner and collaborators, who considered the possibility of it being a boundary of an active galactic nucleus (AGN)-inflated bubble located outside the core, but ...
S. Giacintucci, M. Markevitch, M. Johnston-Hollitt, D. R. Wik, Q. H. S. Wang, T. E. Clarke   +5 more
openaire   +2 more sources

LoTSS giant radio galaxies. I.

, 2020
VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Giant radio galaxies in the LOFAR Two-metre Sky Survey. I.
Leiden University, Sankhyayan, S., Shulevski, A., Shimwell, T. W., Duncan, K. J., Inter University Centre for Astronomy and Astrophysics (IUCAA), Jagiellonian University, Bagchi, J., Morganti, Raffaella, University of Hertfordshire, University of Amsterdam, Dabhade, P., Röttgering, H. J. A., Netherlands Institute for Radio Astronomy, Indian Institute of Science Education and Research (IISER), Hardcastle, M. J., Jamrozy, M., Astronomy   +17 more
core   +2 more sources

Is the giant radio galaxy M 87 a TeV gamma-ray emitter? [PDF]

, 2003
For the first time an excess of photons above an energy threshold of 730 GeV from the giant radio galaxy M 87 has been measured at a significance level above 4 σ.
Mirzoyan, R., Ripken, J., Kohnle, A., Kankanyan, R., R. de los Reyes, Denninghoff, S., Beilicke, M., Rauterberg, G., T. Coarasa, D. Horns, A. Kohnle, O. Bolz, Reyes, R., Ona, E., G. Hermann, A. Plyasheshnikov, Jung, I., D. Kranich, Tluczykont, M., Konopelko, A., Pühlhofer, G., Cortina, J., V. Sahakian, Bernlohr, K., M. Girma, Krawczynski, H., Bojahr, H., F. Aharonian, Samorski, M., H. J. Völk, G. Pühlhofer, Hermann, G., D. Sobzynska, H.-G. Börst, M. Siems, Stamm, W., Lopez, M., W. Rhode, Sahakian, V., Lorenz, E., Mang, O., Moralejo, A., M. Kestel, Contina, J., Rohring, A., A. Moralejo, W. Wittek, M. Lopez, Akhperjanian, A., O. Mang, Gotting, N., G. Rowell, K. Bernlöhr, M. Schilling, Plyasheshnikov, A., Rowell, G., M. V. Fonseca, Kranich, D., E. Lorenz, Kestel, M., M. Tluczykont, Girma, M., A. Heusler, V. Vitale, Meyer, H., R. Mirzoyan, H. Bojahr, A. Konopelko, H. Kornmeyer, J. Cortina, Horns, D., H. Lampeitl, I. Jung, Bolz, O., Völk, H., Borst, H., E. Ona-Wilhelmi, Aharonian, F., Coarasa, T., Heusler, A., W. Stamm, J. L. Contreras, Contreras, J., Lampeitl, H., M. Samorski, Kornmeyer, H., et al., N. Götting, Siems, M., Fonseca, V., C. A. Wiedner, G. Heinzelmann, Rhode, W., M. Beilicke, Wiedner, C., Sobzynska, D., S. Denninghoff, H. Meyer, Panter, M., R. Kankanyan, J. Ripken, M. Panter, A. Akhperjanian, Fonseca, M., W. Hofmann, F. Lucarelli, Wittek, W., Schilling, M., Hofmann, W., Heinzelmann, G., Lucarelli, F.   +110 more
core   +1 more source

Cosmic downsizing of powerful radio galaxies to low radio luminosities [PDF]

, 2015
E.E.R. acknowledges financial support from NWO (grant number: NWO-TOP LOFAR 614.001.006). E.E.R. and J.A. thank the Leiden/ESA astrophysics program for summer students (LEAPS) which supported J.A. in Leiden.Aims. At bright radio powers (P1.4 GHz > 1025 W/
Best, P., E. E. Rigby, H. J. A. Röttgering, Röttgering, H., Rigby, E., Rosario, D., D. Rosario, Rigby, E.E., Argyle, J., P. N. Best, Best, P.N., Röttgering, H.J.A., Argyle, Joshua, J. Argyle   +13 more
core   +1 more source

Giant Metrewave Radio Telescope Observations of Head–Tail Radio Galaxies [PDF]

The Astronomical Journal, 2017
Abstract We present results from a study of seven large known head–tail radio galaxies based on observations using the Giant Metrewave Radio Telescope at 240 and 610 MHz. These observations are used to study the radio morphologies and distribution of the spectral indices across the sources.
Biny Sebastian, Dharam V. Lal, A. Pramesh Rao   +2 more
openaire   +2 more sources

Low-frequency observations of the Giant Radio Galaxy NGC 6251 [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
Abstract We present LOFAR observations at 150 MHz of the borderline FRI/FRII giant radio galaxy NGC 6251. This paper presents the most sensitive and highest-resolution images of NGC 6251 at these frequencies to date, revealing for the first time a low-surface-brightness extension to the northern lobe, and a possible backflow associated ...
C L Van Eck, C Tasse, S S Sridhar, A Shulevski, H J A Röttgering, C J Riseley, S P O’Sullivan, E Orrú, R Morganti, M Jamrozy, M Iacobelli, V Heesen, G Heald, J J Harwood, M J Hardcastle, A O Clarke, J R Callingham, G Brunetti, M Brüggen, P N Best, D D Mulcahy, A M M Scaife, J H Croston, J D Bray, T M Cantwell   +24 more
openaire   +9 more sources