Results 21 to 30 of about 1,073,559 (305)

RADIO DETECTION OF RADIO-QUIET GALAXIES [PDF]

The Astronomical Journal, 2008
We investigate the radio emission of ~185,000 quiescent (optically unclassifiable) galaxies selected from the Sloan Digital Sky Survey (SDSS). By median-stacking FIRST cutouts centered on the optically-selected sources, we are able to reach flux densities down to the 10s of microJy.
W. H. de Vries, W. H. de Vries, Robert H. Becker, Robert H. Becker, Jacqueline Hodge, Richard L. White   +5 more
openaire   +4 more sources

General Physical Properties of Gamma-Ray-emitting Radio Galaxies

The Astrophysical Journal Supplement Series, 2023
We study the radio galaxies with known redshifts detected by the Fermi satellite after 10 yr of data (4FGL-DR2). We use a one-zone leptonic model to fit the quasi-simultaneous multiwavelength data of these radio galaxies and study the distributions of ...
Yongyun Chen, Qiusheng Gu, Junhui Fan, Xiaoling Yu, Nan Ding, Dingrong Xiong, Xiaotong Guo   +6 more
doaj   +1 more source

A New Sample of (Wandering) Massive Black Holes in Dwarf Galaxies from High-resolution Radio Observations [PDF]

Astrophysical Journal, 2019
We present a sample of nearby dwarf galaxies with radio-selected accreting massive black holes (BHs), the majority of which are non-nuclear. We observed 111 galaxies using sensitive, high-resolution observations from the Karl G.
A. Reines, J. Condon, J. Darling, J. Greene   +3 more
semanticscholar   +1 more source

Radio galaxy zoo EMU: towards a semantic radio galaxy morphology taxonomy

Monthly Notices of the Royal Astronomical Society, 2023
ABSTRACT We present a novel natural language processing (NLP) approach to deriving plain English descriptors for science cases otherwise restricted by obfuscating technical terminology. We address the limitations of common radio galaxy morphology classifications by applying this approach.
Micah Bowles, Hongming Tang, Eleni Vardoulaki, Emma L Alexander, Yan Luo, Lawrence Rudnick, Mike Walmsley, Fiona Porter, Anna M M Scaife, Inigo Val Slijepcevic, Elizabeth A K Adams, Alexander Drabent, Thomas Dugdale, Gülay Gürkan, Andrew M Hopkins, Eric F Jimenez-Andrade, Denis A Leahy, Ray P Norris, Syed Faisal ur Rahman, Xichang Ouyang, Gary Segal, Stanislav S Shabala, O Ivy Wong   +22 more
openaire   +5 more sources

Extragalactic Magnetism with SOFIA (SALSA Legacy Program). V. First Results on the Magnetic Field Orientation of Galaxies

The Astrophysical Journal, 2023
We present the analysis of the magnetic field ( B -field) structure of galaxies measured with far-infrared (FIR) and radio (3 and 6 cm) polarimetric observations.
Alejandro S. Borlaff, Enrique Lopez-Rodriguez, Rainer Beck, Susan E. Clark, Evangelia Ntormousi, Konstantinos Tassis, Sergio Martin-Alvarez, Mehrnoosh Tahani, Daniel A. Dale, Ignacio del Moral-Castro, Julia Roman-Duval, Pamela M. Marcum, John E. Beckman, Kandaswamy Subramanian, Sarah Eftekharzadeh, Leslie Proudfit   +15 more
doaj   +1 more source

A representative survey of the dynamics and energetics of FRII radio galaxies [PDF]

, 2017
We report the first large, systematic study of the dynamics and energetics of a representative sample of Fanaroff–Riley type II (FR II) radio galaxies with well-characterized group/cluster environments. We used X-ray inverse-Compton and radio synchrotron
J. Ineson, J. Croston, M. Hardcastle, B. Mingo   +3 more
semanticscholar   +1 more source

On the environments of giant radio galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2021
ABSTRACT We test the hypothesis that environments play a key role in enabling the growth of enormous radio structures spanning more than 700 kpc, an extreme population of radio galaxies called giant radio galaxies (GRGs). To achieve this, we explore (1) the relationships between the occurrence of GRGs and the surface number density of ...
Ting-Wen Lan 藍鼎文, J. Xavier Prochaska, J. Xavier Prochaska   +2 more
openaire   +3 more sources

FRIICAT: A FIRST catalog of FR II radio galaxies [PDF]

, 2017
With the aim of exploring the properties of the class of FR 0 radio galaxies, we selected a sample of 108 compact radio sources, called FR0 CAT , by combining observations from the NVSS, FIRST, and SDSS surveys.
A. Capetti, F. Massaro, R. D. Baldi
semanticscholar   +1 more source

The Environments of Radio Galaxies [PDF]

Symposium - International Astronomical Union, 1996
In the unified schemes of AGNs BL Lac objects are believed to be Fanaroff-Riley (FR) type I radio galaxies with a relativistic jet aligned to the observer's line of sight (e.g. Urry & Padovani 1995). Kollgaard et al. (1992) and Owen et al. (1995) suggest some FR II sources can also be BL Lac parents. Clearly, isotropic properties such as the galaxy
G. Fasano, R. Scarpa, Joseph E. Pesce, R. Falomo   +3 more
openaire   +2 more sources

The triggering probability of radio-loud AGN: A comparison of high and low excitation radio galaxies in hosts of different colors [PDF]

, 2012
Low luminosity radio-loud active galactic nuclei (AGN) are generally found in massive red elliptical galaxies, where they are thought to be powered through gas accretion from their surrounding hot halos in a radiatively inefficient manner.
Abazajian, Baldwin, Balogh, Becker, Best, Best, Best, Best, Brinchmann, Condon, Croton, Evans, H. J. A. Röttgering, Hardcastle, Hickox, J. Brinchmann, Kauffmann, Kauffmann, Kauffmann, Martin, Matthews, P. N. Best, R. M. J. Janssen, Schmidt, Stoughton, Strateva, Strauss, Tadhunter, Tasse, Whysong, York   +30 more
core   +3 more sources