The Atacama Cosmology Telescope (ACT): Beam Profiles and First SZ Cluster Maps
Adam D. Hincks,Viviana Acquaviva,Viviana Acquaviva,Peter A. R. Ade,Paula Aguirre,Mandana Amiri,John W. Appel,Luis F. Barrientos,Elia S. Battistelli,Elia S. Battistelli,John Bond,Benjamin R. Brown,B. Burger,James A. Chervenak,Sudeep Das,Sudeep Das,Mark J. Devlin,Simon Dicker,William B. Doriese,Joanna Dunkley,Joanna Dunkley,Rolando Dünner,Thomas Essinger-Hileman,R. P. Fisher,Joseph W. Fowler,Amir Hajian,Amir Hajian,Mark Halpern,M. Hasselfield,Carlos Hernandez-Monteagudo,Gene C. Hilton,Matt Hilton,Matt Hilton,Renée Hlozek,Kevin M. Huffenberger,David H. Hughes,John P. Hughes,Leopoldo Infante,Kent D. Irwin,Raul Jimenez,Jean Baptiste Juin,Madhuri Kaul,Jeff Klein,Arthur Kosowsky,Judy M. Lau,Judy M. Lau,Michele Limon,Michele Limon,Yen-Ting Lin,Yen-Ting Lin,Yen-Ting Lin,Robert H. Lupton,Tobias A. Marriage,Tobias A. Marriage,Danica Marsden,K. L. Martocci,Philip Daniel Mauskopf,Felipe Menanteau,Kavilan Moodley,Kavilan Moodley,Harvey Moseley,Calvin B. Netterfield,Michael D. Niemack,Michael D. Niemack,Michael R. Nolta,Lyman A. Page,Lucas Parker,Bruce Partridge,Hernan Quintana,Beth Reid,Beth Reid,Neelima Sehgal,Jon Sievers,David N. Spergel,Suzanne T. Staggs,O. R. Stryzak,Daniel S. Swetz,Daniel S. Swetz,Eric R. Switzer,Robert Thornton,Robert Thornton,Hy Trac,Hy Trac,Carole Tucker,Licia Verde,Ryan Warne,Grant W. Wilson,Edward J. Wollack,Yue Zhao +88 more
TL;DR: The Atacama Cosmology Telescope (ACT) is currently observing the cosmic microwave background with arcminute resolution at 148 GHz, 218 GHz, and 277 GHz as mentioned in this paper, where the B-splines are used to model and remove the atmospheric signal.
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Abstract: The Atacama Cosmology Telescope (ACT) is currently observing the cosmic microwave background with arcminute resolution at 148 GHz, 218 GHz, and 277 GHz. In this paper, we present ACT's first results. Data have been analyzed using a maximum-likelihood map-making method which uses B-splines to model and remove the atmospheric signal. It has been used to make high-precision beam maps from which we determine the experiment's window functions. This beam information directly impacts all subsequent analyses of the data. We also used the method to map a sample of galaxy clusters via the Sunyaev-Zel'dovich (SZ) effect, and show five clusters previously detected with X-ray or SZ observations. We provide integrated Compton-y measurements for each cluster. Of particular interest is our detection of the z = 0.44 component of A3128 and our current non-detection of the low-redshift part, providing strong evidence that the further cluster is more massive as suggested by X-ray measurements. This is a compelling example of the redshift-independent mass selection of the SZ effect.
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Citations
Five-year wilkinson microwave anisotropy probe observations: cosmological interpretation
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The Atacama Cosmology Telescope: Sunyaev-Zel'dovich-Selected Galaxy Clusters at 148 GHz in the 2008 Survey
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TL;DR: In this paper, the authors report on 23 clusters detected blindly as Sunyaev-Zel'DOVICH (SZ) decrements in a 148 GHz, 455 deg2 map of the southern sky made with data from the Atacama Cosmology Telescope 2008 observing season.
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