Galaxy And Mass Assembly (GAMA): the 325 MHz radio luminosity function of AGN and star-forming galaxies
作者： Matthew Prescott , T Mauch , MJ Jarvis , K McAlpine , DJB Smith
关键词: Active galactic nucleus 、 Astronomy 、 X-shaped radio galaxy 、 Giant Metrewave Radio Telescope 、 Luminous infrared galaxy 、 Physics 、 Astrophysics 、 Radio galaxy 、 Galaxy 、 Quasar 、 Galaxy formation and evolution
摘要: Measurement of the evolution both active galactic nuclei (AGN) and star-formation in galaxies underpins our understanding galaxy over cosmic time. Radio continuum observations can provide key information on these two processes, particular via mechanical feedback produced by radio jets AGN, an unbiased dust-independent measurement star formation rates. In this paper, we determine luminosity functions at 325 MHz for a sample AGN star-forming matching 138 deg2 survey conducted with Giant Metrewave Telescope, optical imaging redshifts from Galaxy And Mass Assembly survey. We find that function closely follows measured 1.4 GHz. By fitting out to z = 0.5 as double power law, parametrizing Φ ∝ (1 + z)k, parameters k 0.92 ± 0.95 assuming pure density 2.13 1.96 evolution. Low Excitation Galaxies are dominant population space lower luminosities. Comparing GHz, separate steep- flat-spectrum show beamed sources be shifted number coincide unbeamed steep-spectrum sources, is expected orientation-based unification AGN.
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