Results 41 to 50 of about 1,073,559 (305)

Statistical Properties of Radio Emission from the Palomar Seyfert Galaxies [PDF]

, 2001
We have carried out an analysis of the radio and optical properties of a statistical sample of 45 Seyfert galaxies from the Palomar spectroscopic survey of nearby galaxies.
Antonucci R. R. J., Busko I. C., Clark D. H., de Bruyn A. G., de Bruyn A. G., de Grijp M. H. K., Isobe T., James S. Ulvestad, Kukula M. J., Luis C. Ho, Meurs E. J. A., Pedlar A., Perley R. A., Unger S. W., Whittle M., Whittle M.   +15 more
core   +2 more sources

GAMA/WiggleZ: the 1.4 GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z = 0.75 [PDF]

, 2016
© 2016 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. We present radio active galactic nuclei (AGN) luminosity functions over the redshift range 0.005 < z < 0.75.
M. Pracy, J. Ching, E. Sadler, S. Croom, I. Baldry, J. Bland-Hawthorn, S. Brough, Michael J. I. Brown, W. Couch, T. Davis, M. Drinkwater, A. Hopkins, M. Jarvis, Ben Jelliffe, R. Jurek, J. Loveday, K. Pimbblet, M. Prescott, Emily Wisniosk, D. Woods   +19 more
semanticscholar   +1 more source

Combining LOFAR and Apertif Data for Understanding the Life Cycle of Radio Galaxies

Galaxies, 2021
Active galactic nuclei (AGN) at the centres of galaxies can cycle between periods of activity and of quiescence. Characterising the duty-cycle of AGN is crucial for understanding their impact on the evolution of the host galaxy.
Raffaella Morganti, Nika Jurlin, Tom Oosterloo, Marisa Brienza, Emanuela Orrú, Alexander Kutkin, Isabella Prandoni, Elizabeth A. K. Adams, Helga Dénes, Kelley M. Hess, Aleksandar Shulevski, Thijs van der Hulst, Jacob Ziemke   +12 more
doaj   +1 more source

The Photometric and Spectroscopic Properties of Remnant and Restarted Radio Galaxies in the Lockman Hole Field

Galaxies, 2021
Radio galaxies are known to undergo phases of activity, where the stage after the jets have switched off is referred to as the remnant phase. This state can be followed by a restarted phase when the activity reignites. Remnant and restarted radio sources
Nika Jurlin, Raffaella Morganti, Natasha Maddox, Marisa Brienza   +3 more
doaj   +1 more source

Compact radio sources and jet-driven AGN feedback in the early Universe: Constraints from integral-field spectroscopy [PDF]

, 2007
To investigate the impact of radio jets during the formation epoch of their massive host galaxies, we present an analysis of two massive, log(M_stel/ M_sun)~10.6 and 11.3, compact radio galaxies at z=3.5, TNJ0205+2242 and TNJ0121+1320.
A. Gilbert, Axon, Barnes, Begelman, Benson, Best, Bicknell, Blundell, Bonnet, Bullock, C. De Breuck, Capetti, Croton, De Breuck, De Breuck, De Breuck, De Breuck, De Breuck, De Young, Di Matteo, Downes, Holt, Holt, Hopkins, Inskip, Inskip, Inskip, Iwamuro, Kauffmann, Laing, M. D. Lehnert, McCarthy, Morganti, Murgia, N. P. H. Nesvadba, Nelson, Nesvadba, Nesvadba, O'Dea, O'Dea, Owsianik, Papadopoulos, Pedlar, Pounds, Readhead, Silk, Sulentic, Tadhunter, Tadhunter, Tadhunter, van Breugel, Villar-Martín, Villar-Martín, Villar-Martín, Villar-Martín, W. van Breugel, Wellman, Willott   +57 more
core   +1 more source

Galaxy And Mass Assembly (GAMA): the environments of high- and low- excitation radio galaxies [PDF]

, 2017
We study the environments of low- and high- excitation radio galaxies (LERGs and HERGs respectively) in the redshift range $0.01 < z < 0.4$, using a sample of 399 radio galaxies and environmental measurements from the Galaxy And Mass Assembly (GAMA ...
J. Ching, S. Croom, E. Sadler, A. Robotham, S. Brough, I. Baldry, J. Bland-Hawthorn, M. Colless, S. Driver, B. Holwerda, A. Hopkins, M. Jarvis, H. Johnston, L. Kelvin, J. Liske, J. Loveday, P. Norberg, M. Pracy, O. Steele, D. Thomas, L. Sydney, U. S. Andrews, International Centre for Radio Astronomy Research, Australian Astronomical Observatory, Liverpool John Moore's University, The Australian National University, U. Louisville, U. Oxford, U. W. Cape, U. Innsbruck, U. Hamburg, U. Sussex, D. University, U. Portsmouth, S. I. F. S. Research, U. Groningen   +35 more
semanticscholar   +1 more source

Radio AGN in spiral galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
Radio AGN in the nearby Universe are more likely to be found in galaxies with early-type morphology, the detection rate in spiral or late-type galaxies (LTGs) being around an order of magnitude lower. We combine the mJy Imaging VLBA Exploration at 20 cm (mJIVE-20) survey with the Sloan Digital Sky Survey, to study the relatively rare population of AGN ...
Kaviraj, Sugata, Shabala, Stanislav S., Deller, Adam T., Middelberg, Enno   +3 more
openaire   +4 more sources

Radio galaxies dominate the high-energy diffuse gamma-ray background [PDF]

, 2016
It has been suggested that unresolved radio galaxies and radio quasars (sometimes referred to as misaligned active galactic nuclei) could be responsible for a significant fraction of the observed diffuse gamma-ray background.
D. Hooper, T. Linden, A. López
semanticscholar   +1 more source

COLA II - Radio and Spectroscopic Diagnostics of Nuclear Activity in Galaxies [PDF]

, 2002
We present optical spectroscopic observations of 93 galaxies taken from the infra-red selected COLA (Compact Objects in Low Power AGN) sample. The sample spans the range of far-IR luminosities from normal galaxies to LIRGs.
A. Marston, A. Zezas, C. A. Heisler, Clavel J., de Grijp M. H. K., E. A. Corbett, Efstathiou A., Fairall A. P., Fairall A. P., Gardner F. F., Hagiwara Y., Heckman T., Heisler C. A., Keel W. C., Knappen J. H., L. Kewley, Laurent O., M. A. Dopita, Martin J. M., P. N. Appleton, R. P. Norris, V. Charmandaris   +21 more
core   +2 more sources

Alignments of radio galaxies in deep radio imaging of ELAIS N1 [PDF]

, 2016
We present a study of the distribution of radio jet position angles of radio galaxies over an area of 1 square degree in the ELAIS N1 field. ELAIS N1 was observed with the Giant Metrewave Radio Telescope at 612 MHz to an rms noise level of 10 $\mu$Jy and
A. Taylor, P. Jagannathan
semanticscholar   +1 more source