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Evolution of faint radio sources in the VIDEO-XMM3 field
Cosmology and Nongalactic Astrophysics · Submitted 2 Sep 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Star-forming galaxies drive the more rapid evolution at low redshifts, $z{<}$1.2, while more slowly evolving AGN populations dominate at higher redshifts resulting in a decline in the evolution of the radio luminosity function at $z{>}$1.2.
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The abstract, sentence by sentence
It has been speculated that low luminosity radio-loud AGN have the potential to serve as an important source of AGN feedback, and may be responsible for suppressing star-formation activity in massive elliptical galaxies at late times. As such the cosmic evolution of these sources is vitally important to understanding the significance of such AGN feedback processes and their influence on the global star-formation history of the universe. In this paper we present a new investigation of the evolution of faint radio sources out to $z{\sim}2.5$. We combine a 1 square degree VLA radio survey, complete to a depth of 100 $\mu$Jy, with accurate 10 band photometric redshifts from the VIDEO and CFHTLS surveys. The results indicate that the radio population experiences mild positive evolution out to $z{\sim}1.2$ increasing their space density by a factor of $\sim$3, consistent with results of several previous studies. Beyond $z$=1.2 there is evidence of a slowing down of this evolution. Star-forming galaxies drive the more rapid evolution at low redshifts, $z{<}$1.2, while more slowly evolving AGN populations dominate at higher redshifts resulting in a decline in the evolution of the radio luminosity function at $z{>}$1.2. The evolution is best fit by pure luminosity evolution with star-forming galaxies evolving as $(1+z)^{2.47\pm0.12}$ and AGN as $(1+z)^{1.18\pm0.21}$.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | It has been speculated that low luminosity radio-loud AGN have the potential to serve as an important source of AGN feedback, and may be responsible for suppressing star-formation activity in massive elliptical galaxies at late times. | background 1.00 | 0.03 | 0.03 | speculative 0.82 |
| s1 | As such the cosmic evolution of these sources is vitally important to understanding the significance of such AGN feedback processes and their influence on the global star-formation history of the universe. | background 0.99 | 0.04 | 0.03 | asserted 0.96 |
| s2 | In this paper we present a new investigation of the evolution of faint radio sources out to $z{\sim}2.5$. | contribution 1.00 | 0.88 | 0.04 | asserted 0.93 |
| s3 | We combine a 1 square degree VLA radio survey, complete to a depth of 100 $\mu$Jy, with accurate 10 band photometric redshifts from the VIDEO and CFHTLS surveys. | method 0.99 | 0.94 | 0.02 | asserted 0.99 |
| s4 | The results indicate that the radio population experiences mild positive evolution out to $z{\sim}1.2$ increasing their space density by a factor of $\sim$3, consistent with results of several previous studies. | result 1.00 | 0.92 | 0.35 | hedged possibility 0.93 |
| s5 | Beyond $z$=1.2 there is evidence of a slowing down of this evolution. | result 1.00 | 0.88 | 0.14 | hedged possibility 0.80 |
| s6 | Star-forming galaxies drive the more rapid evolution at low redshifts, $z{<}$1.2, while more slowly evolving AGN populations dominate at higher redshifts resulting in a decline in the evolution of the radio luminosity function at $z{>}$1.2. | interpretation 0.91 | 0.86 | 0.41 | asserted 0.99 |
| s7 | The evolution is best fit by pure luminosity evolution with star-forming galaxies evolving as $(1+z)^{2.47\pm0.12}$ and AGN as $(1+z)^{1.18\pm0.21}$. | result 0.98 | 0.92 | 0.35 | asserted 0.98 |
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Original abstract
It has been speculated that low luminosity radio-loud AGN have the potential to serve as an important source of AGN feedback, and may be responsible for suppressing star-formation activity in massive elliptical galaxies at late times. As such the cosmic evolution of these sources is vitally important to understanding the significance of such AGN feedback processes and their influence on the global star-formation history of the universe. In this paper we present a new investigation of the evolution of faint radio sources out to $z{\sim}2.5$. We combine a 1 square degree VLA radio survey, complete to a depth of 100 $\mu$Jy, with accurate 10 band photometric redshifts from the VIDEO and CFHTLS surveys. The results indicate that the radio population experiences mild positive evolution out to $z{\sim}1.2$ increasing their space density by a factor of $\sim$3, consistent with results of several previous studies. Beyond $z$=1.2 there is evidence of a slowing down of this evolution. Star-forming galaxies drive the more rapid evolution at low redshifts, $z{<}$1.2, while more slowly evolving AGN populations dominate at higher redshifts resulting in a decline in the evolution of the radio luminosity function at $z{>}$1.2. The evolution is best fit by pure luminosity evolution with star-forming galaxies evolving as $(1+z)^{2.47\pm0.12}$ and AGN as $(1+z)^{1.18\pm0.21}$.
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References
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3 arXiv papers cite this in 6 sentences
Papers citing it · 4 sentences without a confident label
Uses its method or tool 1 paper
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We then fit for both the AGN evolution parameters ($α_D^AGN$ and $β_D^AGN$) and the SFG evolution parameters ($α_L^SF$ and $β_L^SF$) along with the overall shape of the SFG RLF, similar to [ref] .
MIGHTEE: The evolving radio luminosity functions of star-forming galaxies to $z\sim 4.5$ and the cosmic history of star formation · Parameterisation of the Radio Luminosity Function · 0.87
Cites it as background 1 paper
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As a result, while the nature of the low-frequency extragalactic source population is well constrained down to the micro-Jansky level (e.g. [ref] ), the composition of the higher-frequency sky is relatively unknown.
Exploring the faint source population at 15.7 GHz · Introduction · 0.87
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