A measurement of the millimetre emission and the Sunyaev-Zel'dovich effect associated with low-frequency radio sources

Gralla, Megan B, Crichton, Devin, Marriage, Tobias A, Mo, Wenli, Aguirre, Paula, Addison, Graeme E, Asboth, V, Battaglia, Nick, Bock, James, Bond, J Richard, Devlin, Mark J, Dünner, Rolando, Hajian, Amir, Halpern, Mark, Hilton, Matt, Hincks, Adam D, Hlozek, Renée, Huffenberger, Kevin M, Hughes, John P, Ivison, R J, Kosowsky, Arthur, Lin, Yen-Ting, Marsden, Danica, Menanteau, Felipe, Moodley, Kavilan, Morales, Gustavo, Niemack, Michael D, Oliver, Seb, Page, Lyman A, Partridge, Bruce, Reese, Erik D, Rojas, Felipe, Sehgal, Neelima, Sievers, Jon, Sifon, Cristóbal Sifón, Spergel, David N, Staggs, Suzanne T, Switzer, Eric R, Viero, Marco P, Wollack, Edward J and Zemcov, Michael B (2014) A measurement of the millimetre emission and the Sunyaev-Zel'dovich effect associated with low-frequency radio sources. Monthly Notices of the Royal Astronomical Society, 445 (1). pp. 460-478. ISSN 0035-8711

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We present a statistical analysis of the millimetre-wavelength properties of 1.4GHz-selected sources and a detection of the Sunyaev–Zel’dovich (SZ) effect associated with the haloes that host them. We stack data at 148, 218 and 277GHz from the Atacama Cosmology Telescope at the positions of a large sample of radio AGN selected at 1.4GHz. The thermal SZ effect associated with the haloes that host the AGN is detected at the 5σ level through its spectral signature, representing a statistical detection of the SZ effect in some of the lowest mass haloes (average M 200 ≈ 10 13 M. h −1 70 ) studied to date. The relation between the SZ effect and mass (based on weak lensing measurements of radio galaxies) is consistent with that measured by Planck for local bright galaxies. In the context of galaxy evolution models, this study confirms that galaxies with radio AGN also typically support hot gaseous haloes. Adding Herschel observations allows us to show that the SZ signal is not significantly contaminated by dust emission. Finally, we analyse the contribution of radio sources to the angular power spectrum of the cosmic microwave background.

Item Type: Article
Keywords: active–galaxies: haloes–galaxies: statistics–radio continuum:galaxies
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy > QB0460 Astrophysics
Depositing User: Richard Chambers
Date Deposited: 15 May 2015 09:40
Last Modified: 07 Mar 2017 07:34
URI: http://srodev.sussex.ac.uk/id/eprint/54012

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