GAMA/WiggleZ: The 1.4GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z=0.75
We present radio active galactic nuclei (AGN) luminosity functions over the redshift range 0.005 < z < 0.75. The sample from which the luminosity functions are constructed is an optical spectroscopic survey of radio galaxies, identified from matched Faint Images of the Radio Sky at Twe...
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| Format: | Journal article |
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Oxford University Press
2016
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| _version_ | 1826258767828746240 |
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| author | Pracy, M Ching, J Sadler, E Croom, S Baldry, I Bland-Hawthorn, J Brough, S Brown, M Couch, W Davis, T Drinkwater, M Jarvis, M Jelliffe, B Jurek, R Loveday, J Pimbblet, K Prescott, M Wisnioski, E Woods, D |
| author_facet | Pracy, M Ching, J Sadler, E Croom, S Baldry, I Bland-Hawthorn, J Brough, S Brown, M Couch, W Davis, T Drinkwater, M Jarvis, M Jelliffe, B Jurek, R Loveday, J Pimbblet, K Prescott, M Wisnioski, E Woods, D |
| author_sort | Pracy, M |
| collection | OXFORD |
| description | We present radio active galactic nuclei (AGN) luminosity functions over the redshift range 0.005 < z < 0.75. The sample from which the luminosity functions are constructed is an optical spectroscopic survey of radio galaxies, identified from matched Faint Images of the Radio Sky at Twenty-cm survey (FIRST) sources and Sloan Digital Sky Survey images. The radio AGN are separated into low-excitation radio galaxies (LERGs) and high-excitation radio galaxies (HERGs) using the optical spectra. We derive radio luminosity functions for LERGs and HERGs separately in the three redshift bins (0.005 < z < 0.3, 0.3 < z < 0.5 and 0.5 < z < 0.75). The radio luminosity functions can be well described by a double power law. Assuming this double power-law shape the LERG population displays little or no evolution over this redshift range evolving as ∼(1+z)0.06+0.17−0.18 assuming pure density evolution or ∼(1+z)0.46+0.22−0.24 assuming pure luminosity evolution. In contrast, the HERG population evolves more rapidly, best fitted by ∼(1+z)2.93+0.46−0.47 assuming a double power-law shape and pure density evolution. If a pure luminosity model is assumed, the best-fitting HERG evolution is parametrized by ∼(1+z)7.41+0.79−1.33 . The characteristic break in the radio luminosity function occurs at a significantly higher power (≳1 dex) for the HERG population in comparison to the LERGs. This is consistent with the two populations representing fundamentally different accretion modes. |
| first_indexed | 2024-03-06T18:39:12Z |
| format | Journal article |
| id | oxford-uuid:0c51f2b8-92d8-4734-8b78-4762e9e2ea8e |
| institution | University of Oxford |
| last_indexed | 2024-03-06T18:39:12Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:0c51f2b8-92d8-4734-8b78-4762e9e2ea8e2022-03-26T09:34:18ZGAMA/WiggleZ: The 1.4GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z=0.75Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0c51f2b8-92d8-4734-8b78-4762e9e2ea8eSymplectic Elements at OxfordOxford University Press2016Pracy, MChing, JSadler, ECroom, SBaldry, IBland-Hawthorn, JBrough, SBrown, MCouch, WDavis, TDrinkwater, MJarvis, MJelliffe, BJurek, RLoveday, JPimbblet, KPrescott, MWisnioski, EWoods, DWe present radio active galactic nuclei (AGN) luminosity functions over the redshift range 0.005 < z < 0.75. The sample from which the luminosity functions are constructed is an optical spectroscopic survey of radio galaxies, identified from matched Faint Images of the Radio Sky at Twenty-cm survey (FIRST) sources and Sloan Digital Sky Survey images. The radio AGN are separated into low-excitation radio galaxies (LERGs) and high-excitation radio galaxies (HERGs) using the optical spectra. We derive radio luminosity functions for LERGs and HERGs separately in the three redshift bins (0.005 < z < 0.3, 0.3 < z < 0.5 and 0.5 < z < 0.75). The radio luminosity functions can be well described by a double power law. Assuming this double power-law shape the LERG population displays little or no evolution over this redshift range evolving as ∼(1+z)0.06+0.17−0.18 assuming pure density evolution or ∼(1+z)0.46+0.22−0.24 assuming pure luminosity evolution. In contrast, the HERG population evolves more rapidly, best fitted by ∼(1+z)2.93+0.46−0.47 assuming a double power-law shape and pure density evolution. If a pure luminosity model is assumed, the best-fitting HERG evolution is parametrized by ∼(1+z)7.41+0.79−1.33 . The characteristic break in the radio luminosity function occurs at a significantly higher power (≳1 dex) for the HERG population in comparison to the LERGs. This is consistent with the two populations representing fundamentally different accretion modes. |
| spellingShingle | Pracy, M Ching, J Sadler, E Croom, S Baldry, I Bland-Hawthorn, J Brough, S Brown, M Couch, W Davis, T Drinkwater, M Jarvis, M Jelliffe, B Jurek, R Loveday, J Pimbblet, K Prescott, M Wisnioski, E Woods, D GAMA/WiggleZ: The 1.4GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z=0.75 |
| title | GAMA/WiggleZ: The 1.4GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z=0.75 |
| title_full | GAMA/WiggleZ: The 1.4GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z=0.75 |
| title_fullStr | GAMA/WiggleZ: The 1.4GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z=0.75 |
| title_full_unstemmed | GAMA/WiggleZ: The 1.4GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z=0.75 |
| title_short | GAMA/WiggleZ: The 1.4GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z=0.75 |
| title_sort | gama wigglez the 1 4ghz radio luminosity functions of high and low excitation radio galaxies and their redshift evolution to z 0 75 |
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