Radio Galaxy Zoo:a search for hybrid morphology radio galaxies

Kapińska, A. D. and Terentev, I. and Wong, O. I. and Shabala, S. S. and Andernach, H. and Rudnick, L. and Storer, L. and Banfield, J. K. and Willett, K. W. and De Gasperin, F. and Lintott, C. J. and López-sánchez, Á. R. and Middelberg, E. and Norris, R. P. and Schawinski, K. and Seymour, N. and Simmons, B. (2017) Radio Galaxy Zoo:a search for hybrid morphology radio galaxies. The Astronomical Journal, 154 (6). ISSN 0004-6256

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Hybrid morphology radio sources (HyMoRS) are a rare type of radio galaxy that display different Fanaroff–Riley classes on opposite sides of their nuclei. To enhance the statistical analysis of HyMoRS, we embarked on a largescale search of these sources within the international citizen science project, Radio Galaxy Zoo (RGZ). Here, we present 25 new candidate hybrid morphology radio galaxies. Our selected candidates are moderate power radio galaxies (Lmedian 4.7 10 = ´ 24 W Hz−1 sr−1 ) at redshifts 0.14 1.0 < 1 Mpc) radio galaxies, one resides at the center of a galaxy cluster, and one is hosted by a rare green bean galaxy. Although the origin of the hybrid morphology radio galaxies is still unclear, this type of radio source starts depicting itself as a rather diverse class. We discuss hybrid radio morphology formation in terms of the radio source environment (nurture) and intrinsically occurring phenomena (nature; activity cessation and amplification), showing that these peculiar radio galaxies can be formed by both mechanisms. While high angular resolution follow-up observations are still necessary to confirm our candidates, we demonstrate the efficacy of the RGZ in the pre-selection of these sources from all-sky radio surveys, and report the reliability of citizen scientists in identifying and classifying complex radio sources.

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Journal Article
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The Astronomical Journal
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20 Sep 2018 15:38
Last Modified:
18 Sep 2023 01:25