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Galaxy cluster scaling relations measured with APEX-SZ

A. N. Bender ; J. Kennedy ; P. A. R. Ade ; K. Basu ; F. Bertoldi ; S. Burkutean ; J. Clarke ; Daniel Dahlin (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; M. Dobbs ; D. Ferrusca ; D. Flanigan ; N. W. Halverson ; W. L. Holzapfel ; Cathy Horellou (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; B. R. Johnson ; Z. D. Kermish ; M. Klein ; R. Kneissl ; T. Lanting ; A. T. Lee ; J. Mehl ; K. M. Menten ; D. Muders ; A. Nagarajan ; F. Pacaud ; C. L. Reichardt ; P. L. Richards ; R. Schaaf ; D. Schwan ; M. W. Sommer ; H. Spieler ; C. Tucker ; B. Westbrook
Monthly notices of the Royal Astronomical Society (0035-8711). Vol. 460 (2016), 4, p. 3432-3446.
[Artikel, refereegranskad vetenskaplig]

We present thermal Sunyaev-Zel'dovich effect (SZE) measurements for 42 galaxy clusters observed at 150 GHz with the APEX-SZ experiment. For each cluster, we model the pressure profile and calculate the integrated Comptonization Y to estimate the total thermal energy of the intraclustermedium (ICM). We compare the measured Y values to X-ray observables of the ICM from the literature (cluster gas mass M-gas, temperature T-X, and Y-X = MgasTX) that relate to total cluster mass. We measure power-law scaling relations, including an intrinsic scatter, between the SZE and X-ray observables for three subsamples within the set of 42 clusters that have uniform X-ray analysis in the literature. We observe that differences between these X-ray analyses introduce significant variance into the measured scaling relations, particularly affecting the normalization. For all three subsamples, we find results consistent with a selfsimilarmodel of cluster evolution dominated by gravitational effects. Comparing to predictions from numerical simulations, these scaling relations prefer models that include cooling and feedback in the ICM. Lastly, we measure an intrinsic scatter of similar to 28 per cent in the Y - Y-X scaling relation for all three subsamples.

Nyckelord: galaxies: clusters: general, cosmic background radiation, cosmology: observations



Denna post skapades 2016-09-30. Senast ändrad 2016-10-13.
CPL Pubid: 242723

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur