منابع مشابه
AO Observations of Three Powerful Radio Galaxies
The host galaxies of powerful radio sources are ideal laboratories to study active galactic nuclei (AGN). The galaxies themselves are among the most massive systems in the universe, and are believed to harbor supermassive black holes (SMBH). If large galaxies are formed in a hierarchical way by multiple merger events, radio galaxies at low redshift represent the end-products of this process. Ho...
متن کاملRadio Detection of Radio-quiet Galaxies
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 μJy. The quiescent galaxy sample is composed of two subgroups inhabiting vastly different regimes: those targeted for the...
متن کاملGiant Radio Galaxies
Giant radio galaxies (GRGs) are the largest structures associated with single galaxies. Their linear sizes exceed 1 Mpc and so they form the extreme tail of the radio galaxy population. Because they have expanded to such large sizes, GRGs are thought to be the endpoint of radio galaxy evolution and provide important constraints to evolutionary models. They extend well past the environment of th...
متن کاملExtremely Red Radio Galaxies
At least half the radio galaxies at z > 1 in the 7C Redshift Survey have extremely red colours (R−K > 5), consistent with stellar populations which formed at high redshift (z ∼ 5). We discuss the implications of this for the evolution of massive galaxies in general and for the fraction of near-IR-selected EROs which host AGN, a result which is now being tested by deep, hard X-ray surveys. The c...
متن کاملSeyferts and Radio Galaxies
Observations with Compton Gamma Ray Observatory have provided key insights to the high energy emission mechanisms in Active Galactic Nuclei (AGN) and clearly separate them into a class of Blazars, with apparent non-thermal jet emissions often peaking in the EGRET energy band, and into the Seyfert class with emissions more closely related to the accretion disk presumably energizing the nuclear b...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1978
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/183.3.479