Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 453, Issue 3, Pages 2326-2340Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1688
Keywords
methods: data analysis; infrared: galaxies; radio continuum: galaxies
Categories
Funding
- Australian Research Council
- U.S. National Science Foundation [AST-112595]
- Australian Research Council [DE130101399]
- Australian Research Council Future Fellowship
- Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO) [CE110001020]
- Swiss National Science Foundation [PP00P2_138979/1]
- National Aeronautics and Space Administration
- NASA through the SIRTF Legacy Program [1407]
- Jet Propulsion Laboratory
- STFC [ST/H002456/1, ST/K005596/1, ST/L000695/1, ST/I001212/1, ST/H007156/1, ST/I003673/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K005596/1, ST/H002456/1, ST/L000695/1, ST/I003673/1, ST/H007156/1] Funding Source: researchfish
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1211595] Funding Source: National Science Foundation
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We present results from the first 12 months of operation of Radio Galaxy Zoo, which upon completion will enable visual inspection of over 170 000 radio sources to determine the host galaxy of the radio emission and the radio morphology. Radio Galaxy Zoo uses 1.4 GHz radio images from both the Faint Images of the Radio Sky at Twenty Centimeters (FIRST) and the Australia Telescope Large Area Survey (ATLAS) in combination with mid-infrared images at 3.4 mu m from the Wide-field Infrared Survey Explorer (WISE) and at 3.6 mu m from the Spitzer Space Telescope. We present the early analysis of the WISE mid-infrared colours of the host galaxies. For images in which there is >75 per cent consensus among the Radio Galaxy Zoo cross-identifications, the project participants are as effective as the science experts at identifying the host galaxies. The majority of the identified host galaxies reside in the mid-infrared colour space dominated by elliptical galaxies, quasi-stellar objects and luminous infrared radio galaxies. We also find a distinct population of Radio Galaxy Zoo host galaxies residing in a redder mid-infrared colour space consisting of star-forming galaxies and/or dust-enhanced non-star-forming galaxies consistent with a scenario of merger-driven active galactic nuclei (AGN) formation. The completion of the full Radio Galaxy Zoo project will measure the relative populations of these hosts as a function of radio morphology and power while providing an avenue for the identification of rare and extreme radio structures. Currently, we are investigating candidates for radio galaxies with extreme morphologies, such as giant radio galaxies, late-type host galaxies with extended radio emission and hybrid morphology radio sources.
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