Extended radio jets in the high-redshift quasars 3C 9 and 280.1
نویسندگان
چکیده
منابع مشابه
High-Redshift, Radio-Loud Quasars
I discuss two programs to study radio-loud quasars at high (z ∼ > 4) redshift. Quasars are the most luminous, non-transient objects known and are observed to the earliest cosmic epochs. At lower redshifts, radio-loud quasars are associated with host galaxies having de Vaucoleurs profiles. By association, identifying and studying a sample of high-redshift, radio-loud quasars provides important c...
متن کاملThe Evolution of Radio-Loud Quasars at High Redshift
We present results from two surveys for radio-loud quasars. These are (1) a northern survey reaching S 5GHz = 0:2Jy and (2) the Parkes QSO survey reaching S 2:7GHz = 0:25Jy which together cover most of the sky. Both surveys use digitised plate material to identify the majority of the radio sources and CCD images to identify the optically fainter sources. The northern survey was targeted speciic...
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We discuss radio observations of a sample of radio-weak and radio-intermediate quasars which demonstrate that { just like their radio-loud counterparts { radio-weak quasars too have relativistic jets in their nuclei. Moreover, a VLA survey of nearby LINER galaxies reveals a relatively large number of at-spectrum radio cores. It is suggested that those cores are also best explained by moderately...
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We briefly discuss the latest ASCA results on the X–ray spectral properties of high-redshift radio-quiet quasars.
متن کاملHigh - redshift obscured quasars
Using mid-infrared and radio criteria, we select a sample of candidate z ∼ 2 obscured quasars. Optical spectroscopy confirms about half of these as type-2 quasars, and modelling the population suggests 50-80% of the quasars are obscured. We find some flat radio spectrum type-2 quasars, and tentative evidence for obscuration unrelated to the torus. Using a similar sample, we also find evidence f...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1982
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/201.2.393