Megahertz peaked-spectrum sources in the Boötes field I - a route towards finding high-redshift AGN
نویسندگان
چکیده
منابع مشابه
Gigahertz-Peaked Spectrum Radio Sources
The study of compact AGN which possess convex radio spectra (the gigahertz-peaked spectrum, or GPS sources) has generated a lot of interest over the last four decades, since these objects offer a unique opportunity to probe both the early evolutionary stages of relativistic AGN jets and their immediate nuclear environments. In this article I trace Ken Kellermann’s early investigations of these ...
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Data from a recent Australia Telescope Compact Array (ATCA) program of multi-frequency, multi-epoch monitoring of 202 active galactic nuclei with declinations < +10 • have been searched for GHz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) radio sources. Supplementary data at higher and lower frequencies, where available, have been used to further examine the spectral properties of pre...
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ASTRONOMY AND ASTROPHYSICS AGN and starbursts at high redshift: High resolution EVN radio observations of the Hubble Deep Field. Abstract. We present deep, wide-field European VLBI Network (EVN) 1.6 GHz observations of the Hubble Deep Field (HDF) region with a resolution of 0.025 arcseconds. Above the 210 µJy/beam (5σ) detection level, the EVN clearly detects two radio sources in a field that e...
متن کاملGigahertz Peaked Spectrum sources from the Jodrell Bank – VLA Astrometric Survey I . Sources in the region 35 ◦ ≤ δ ≤ 75 ◦
Observations with MERLIN at 408 MHz have been used to establish the low-frequency part of the spectra of more than a hundred compact radio sources taken from the part of the Jodrell Bank–VLA Astrometric Survey limited by 35 ≤ δ ≤ 75. These sources were selected from JVAS and other catalogues to have convex spectra between 1.4 and 8.4 GHz, characteristic of Gigahertz Peaked Spectrum (GPS) source...
متن کاملThe evolution of GHz-peaked-spectrum radio sources
Observations of extended radio emission in some GPS sources suggest that they may not be a young version of the classical doubles. The compact source would be confined by the presence of a dense medium in the center of the galaxy. The existence of such a dense environment is supported by the observation of disturbed optical morphologies indicating galaxygalaxy interaction or mergers. A simple m...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2015
ISSN: 1365-2966,0035-8711
DOI: 10.1093/mnras/stv681