A new sample of large angular size radio galaxies
نویسندگان
چکیده
منابع مشابه
A new sample of large angular size radio galaxies I . The radio data
We present a new sample of 84 large angular size radio galaxies selected from the NRAO VLA Sky Survey. Radio sources with declination above +60 • , total flux density greater than 100 mJy at 1.4 GHz and angular size larger than 4 ′ have been selected and observed with the VLA at 1.4 and 4.9 GHz. The radio observations attempt to confirm the large angular size sources and to isolate the core emi...
متن کاملA new sample of large angular size radio galaxies III . Statistics and evolution of the grown population
We present in this paper a detailed study of a new sample of large angular size FR I and FR II radio galaxies and compare the properties of the two classes. As expected, a pure morphology based distinction of FR Is and FR IIs corresponds to a break in total radio power. The radio cores in FR Is are also weaker than in FR IIs, although there is not a well defined break power. We find that asymme...
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We discuss the “angular size – redshift” relation for compact radio sources distributed over a wide range of redshifts 0.011 ≤ z ≤ 4.72. Our study is based on a sample of 330 5 GHz VLBI contour maps taken from the literature. Unlike extended source samples, the “angular size – redshift” relation for compact radio sources appears consistent with the predictions of standard Friedmann world models...
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We present results of a study of neutral hydrogen (H I) in a complete sample of nearby non-cluster radio galaxies. We find that radio galaxies with large amounts of extended H I (M HI 10 9 M ⊙) all have a compact radio source. The host galaxies of the more extended radio sources, all of Fanaroff & Riley type-I, do not contain these amounts of H I. We discuss several possible explanations for th...
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We have formed a complete sample of 26 low redshift (z < ∼ 0.3) giant radio galaxies (GRGs) from the WENSS survey, selected at flux densities above 1 Jy at 325 MHz. We present 10.5-GHz observations with the 100-m Effelsberg telescope of 18 sources in this sample. These observations, together with similar data of the remaining eight sources, are combined with data from the WENSS, NVSS and GB6 su...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2001
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20010254