MERGHERS pilot: MeerKAT discovery of diffuse emission in nine massive Sunyaev–Zel’dovich-selected galaxy clusters from ACT
| Autor: | Alessandro Schillaci, S. Amodeo, Matt Hilton, Kavilan Moodley, Kevin M. Huffenberger, L. A. Page, Mark J. Devlin, Laura Newburgh, Zhilei Xu, F. de Gasperin, Christoph Pfrommer, Sigurd Naess, Kaustuv Basu, Maria Salatino, D. Crichton, Edward J. Wollack, B. Partridge, Nadeem Oozeer, Oleg Smirnov, Chiara Ferrari, C. Sifon, Andrew J. Baker, Brian J. Koopman, John P. Hughes, Denisha S. Pillay, Tony Mroczkowski, Kenda Knowles, Sinenhlanhla P. Sikhosana, Federico Nati |
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| Přispěvatelé: | Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Knowles, K, Pillay, D, Amodeo, S, Baker, A, Basu, K, Crichton, D, De Gasperin, F, Devlin, M, Ferrari, C, Hilton, M, Huffenberger, K, Hughes, J, Koopman, B, Moodley, K, Mroczkowski, T, Naess, S, Nati, F, Newburgh, L, Oozeer, N, Page, L, Partridge, B, Pfrommer, C, Salatino, M, Schillaci, A, Sifon, C, Smirnov, O, Sikhosana, S, Wollack, E, Xu, Z |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics radio continuum: general FOS: Physical sciences Astronomy and Astrophysics Astrophysics 7. Clean energy 01 natural sciences Redshift Radio halo Space and Planetary Science Observatory galaxies: clusters: general 0103 physical sciences Cluster (physics) Halo [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] 010303 astronomy & astrophysics Galaxy cluster Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Mon.Not.Roy.Astron.Soc. Mon.Not.Roy.Astron.Soc., 2021, 504 (2), pp.1749-1758. ⟨10.1093/mnras/stab939⟩ Monthly Notices of the Royal Astronomical Society |
| Popis: | The MeerKAT Exploration of Relics, Giant Halos, and Extragalactic Radio Sources (MERGHERS) survey is a planned project to study a large statistical sample of galaxy clusters with the MeerKAT observatory. Here we present the results of a 16--hour pilot project, observed in response to the 2019 MeerKAT Shared Risk proposal call, to test the feasibility of using MeerKAT for a large cluster study using short (0.2--2.1\,hour) integration times. The pilot focuses on 1.28\,GHz observations of 13 massive, low-to-intermediate redshift ($0.22 < z < 0.65$) clusters from the Sunyaev-Zel'dovich-selected Atacama Cosmology Telescope (ACT) DR5 catalogue that show multiwavelength indications of dynamical disturbance. With a 70 per cent detection rate (9/13 clusters), this pilot study validates our proposed MERGHERS observing strategy and provides twelve detections of diffuse emission, eleven of them new, indicating the strength of MeerKAT for such types of studies. The detections (signal-to-noise ratio $\gtrsim6$) are summarised as follows: two systems host both relic(s) and a giant radio halo, five systems host radio halos, and two have candidate radio halos. Power values, $k$-corrected to 1.4 GHz assuming a fiducial spectral index of $��= -1.3 \pm 0.4$, are consistent with known radio halo and relic scaling relations. 9 pages, 4 figures, 2 tables. Accepted to MNRAS |
| Databáze: | OpenAIRE |
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