Overview of the Atacama Cosmology Telescope: Receiver, Instrumentation, and Telescope Systems

Swetz, Daniel S.; Ade, Peter A. R.; Amiri, M.; Appel, John W.; Battistelli, E. S.; Burger, B.; Chervenak, James A.; Devlin, Mark J.; Dicker, Simon; Doriese, W. B.; Dünner, Rolando; Essinger‐Hileman, T.; Fisher, R. P.; Fowler, Joseph W.; Halpern, M.; Hasselfield, Matthew; Hilton, G. C.; Hincks, Adam D.; Irwin, K. D.; Jarosik, N.; Kaul, Madhuri; Klein, J.; Lau, Judy M.; Limon, M.; Marriage, Tobias A.; Marsden, Danica; Martocci, Krista; Mauskopf, Philip Daniel; Moseley, H.; Netterfield, C. B.; Niemack, Michael D.; Nolta, M. R.; Page, Lyman A.; Parker, Lucas; Staggs, Suzanne T.; Stryzak, O. R.; Switzer, Eric R.; Thornton, Robert J.; Tucker, C.; Wollack, Edward J.; Zhao, Yue

doi:10.1088/0067-0049/194/2/41

Cited by 219 publications

(193 citation statements)

References 37 publications

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“…The ACT experiment (Swetz et al, 2011) is a 6 m millimeter telescope which was installed on Cerro Toco in Chile in 2007. With a beamsize about an arcminute across, observations are conducted 1.1 mm, 1.4 mm and 2.0 mm with the primary goal understanding the CMB through the Sunyaev-Zeldovich (SZ) effect and measuring temperature variations of the CMB down to arcminute scales.…”

Section: Atacama Cosmology Telescope [Act] 2007-presentmentioning

confidence: 99%

Dusty star-forming galaxies at high redshift

2014

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Far-infrared and submillimeter wavelength surveys have now established the important role of dusty, star-forming galaxies (DSFGs) in the assembly of stellar mass and the evolution of massive galaxies in the Universe. The brightest of these galaxies have infrared luminosities in excess of 10 13 L with implied star-formation rates of thousands of solar masses per year. They represent the most intense starbursts in the Universe, yet many are completely optically obscured. Their easy detection at submm wavelengths is due to dust heated by ultraviolet radiation of newly forming stars. When summed up, all of the dusty, star-forming galaxies in the Universe produce an infrared radiation field that has an equal energy density as the direct starlight emission from all galaxies visible at ultraviolet and optical wavelengths. The bulk of this infrared extragalactic background light emanates from galaxies as diverse as gas-rich disks to mergers of intense starbursting galaxies. Major advances in far-infrared instrumentation in recent years, both spacebased and ground-based, has led to the detection of nearly a million DSFGs, yet our understanding of the underlying astrophysics that govern the start and end of the dusty starburst phase is still in nascent stage. This review is aimed at summarizing the current status of DSFG studies, focusing especially on the detailed characterization of the bestunderstood subset (submillimeter galaxies, who were summarized in the last review of this field over a decade ago, Blain et al. 2002), but also the selection and characterization of more recently discovered DSFG populations. We review DSFG population statistics, their physical properties including dust, gas and stellar contents, their environments, and current theoretical models related to the formation and evolution of these galaxies.

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Section: Atacama Cosmology Telescope [Act] 2007-presentmentioning

confidence: 99%

Dusty star-forming galaxies at high redshift

2014

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“…The Planck cluster sample is complementary to those from observations using the South Pole Telescope (SPT, Carlstrom et al 2011) and the Atacama Cosmology Telescope (ACT, Swetz et al 2011), whose teams recently published the first large samples of SZ-selected clusters Hasselfield et al 2013). The resolution of Planck at the relevant frequencies is between 5 and 10 arcmin, whereas that for ACT and SPT is about 1 arcmin, but the Planck sky coverage is much greater.…”

Section: Introductionmentioning

confidence: 99%

Planck2013 results. XX. Cosmology from Sunyaev–Zeldovich cluster counts

Ade¹,

Aghanim²,

Arnaud³

et al. 2014

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We present constraints on cosmological parameters using number counts as a function of redshift for a sub-sample of 189 galaxy clusters from the Planck SZ (PSZ) catalogue. The PSZ is selected through the signature of the Sunyaev-Zeldovich (SZ) effect, and the sub-sample used here has a signal-to-noise threshold of seven, with each object confirmed as a cluster and all but one with a redshift estimate. We discuss the completeness of the sample and our construction of a likelihood analysis. Using a relation between mass M and SZ signal Y calibrated to X-ray measurements, we derive constraints on the power spectrum amplitude σ 8 and matter density parameter Ω m in a flat ΛCDM model. We test the robustness of our estimates and find that possible biases in the Y-M relation and the halo mass function are larger than the statistical uncertainties from the cluster sample. Assuming the X-ray determined mass to be biased low relative to the true mass by between zero and 30%, motivated by comparison of the observed mass scaling relations to those from a set of numerical simulations, we find that σ 8 = 0.75 ± 0.03, Ω m = 0.29 ± 0.02, and σ 8 (Ω m /0.27) 0.3 = 0.764 ± 0.025. The value of σ 8 is degenerate with the mass bias; if the latter is fixed to a value of 20% (the central value from numerical simulations) we find σ 8 (Ω m /0.27) 0.3 = 0.78 ± 0.01 and a tighter one-dimensional range σ 8 = 0.77 ± 0.02. We find that the larger values of σ 8 and Ω m preferred by Planck's measurements of the primary CMB anisotropies can be accommodated by a mass bias of about 40%. Alternatively, consistency with the primary CMB constraints can be achieved by inclusion of processes that suppress power on small scales relative to the ΛCDM model, such as a component of massive neutrinos. We place our results in the context of other determinations of cosmological parameters, and discuss issues that need to be resolved in order to make further progress in this field.

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“…In parallel, SZ observations with instruments such as the SunyaevZeldovich Array (SZA, Muchovej et al 2007), the South Pole Telescope (SPT, Carlstrom et al 2011), the Atacama Cosmology Telescope (ACT, Swetz et al 2011), and Planck (Tauber et al 2010) 1 have recently started to deliver on the promise of SZ observations for cluster studies.…”

Section: Introductionmentioning

confidence: 99%

Planckintermediate results

Ade

Aghanim

Arnaud

et al. 2013

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291

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Taking advantage of the all-sky coverage and broad frequency range of the Planck satellite, we study the Sunyaev-Zeldovich (SZ) and pressure profiles of 62 nearby massive clusters detected at high significance in the 14-month nominal survey. Careful reconstruction of the SZ signal indicates that most clusters are individually detected at least out to R 500 . By stacking the radial profiles, we have statistically detected the radial SZ signal out to 3 × R 500 , i.e., at a density contrast of about 50-100, though the dispersion about the mean profile dominates the statistical errors across the whole radial range. Our measurement is fully consistent with previous Planck results on integrated SZ fluxes, further strengthening the agreement between SZ and X-ray measurements inside R 500 . Correcting for the effects of the Planck beam, we have calculated the corresponding pressure profiles. This new constraint from SZ measurements is consistent with the X-ray constraints from XMM-Newton in the region in which the profiles overlap (i.e., [0.1-1] R 500 ), and is in fairly good agreement with theoretical predictions within the expected dispersion. At larger radii the average pressure profile is slightly flatter than most predictions from numerical simulations. Combining the SZ and X-ray observed profiles into a joint fit to a generalised pressure profile gives best-fit parameters [P 0 , c 500 , γ, α, β] = [6.41, 1.81, 0.31, 1.33, 4.13]. Using a reasonable hypothesis for the gas temperature in the cluster outskirts we reconstruct from our stacked pressure profile the gas mass fraction profile out to 3 R 500 . Within the temperature driven uncertainties, our Planck constraints are compatible with the cosmic baryon fraction and expected gas fraction in halos. Key words. cosmology: observations -galaxies: clusters: general -galaxies: clusters: intracluster medium -submillimeter: general -X-rays: general Appendices are available in electronic form at

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Overview of the Atacama Cosmology Telescope: Receiver, Instrumentation, and Telescope Systems

Cited by 219 publications

References 37 publications

Dusty star-forming galaxies at high redshift

Dusty star-forming galaxies at high redshift

Planck2013 results. XX. Cosmology from Sunyaev–Zeldovich cluster counts

Planckintermediate results

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