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Book ; Online: The Atacama Cosmology Telescope

Modeling Bulk Atmospheric Motion

2021

Abstract: Fluctuating atmospheric emission is a dominant source of noise for ground-based millimeter-wave observations of the CMB temperature anisotropy at angular scales $\gtrsim 0.5^{\circ}$. We present a model of the atmosphere as a discrete set of emissive ... ...

Abstract	Fluctuating atmospheric emission is a dominant source of noise for ground-based millimeter-wave observations of the CMB temperature anisotropy at angular scales $\gtrsim 0.5^{\circ}$. We present a model of the atmosphere as a discrete set of emissive turbulent layers that move with respect to the observer with a horizontal wind velocity. After introducing a statistic derived from the time-lag dependent correlation function for detector pairs in an array, referred to as the pair-lag, we use this model to estimate the aggregate angular motion of the atmosphere derived from time-ordered data from the Atacama Cosmology Telescope (ACT). We find that estimates derived from ACT's CMB observations alone agree with those derived from satellite weather data that additionally include a height-dependent horizontal wind velocity and water vapor density. We also explore the dependence of the measured atmospheric noise spectrum on the relative angle between the wind velocity and the telescope scan direction. In particular, we find that varying the scan velocity changes the noise spectrum in a predictable way. Computing the pair-lag statistic opens up new avenues for understanding how atmospheric fluctuations impact measurements of the CMB anisotropy.
Keywords	Astrophysics - Instrumentation and Methods for Astrophysics ; Astrophysics - Cosmology and Nongalactic Astrophysics
Subject code	551
Publishing date	2021-11-01
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Comparing complex impedance and bias step measurements of Simons Observatory transition edge sensors

Cothard, Nicholas F. / Ali, Aamir M. / Austermann, Jason E. / Choi, Steve K. / Crowley, Kevin T. / Dober, Bradley J. / Duell, Cody J. / Duff, Shannon M. / Gallardo, Patricio / Hilton, Gene C. / Ho, Shuay-Pwu Patty / Hubmayr, Johannes / Link, Michael J. / Niemack, Michael D. / Sonka, Rita F. / Staggs, Suzanne T. / Vavagiakis, Eve M. / Wollack, Edward J. / Xu, Zhilei

2020

Abstract: The Simons Observatory (SO) will perform ground-based observations of the cosmic microwave background (CMB) with several small and large aperture telescopes, each outfitted with thousands to tens of thousands of superconducting aluminum manganese (AlMn) ... ...

Abstract	The Simons Observatory (SO) will perform ground-based observations of the cosmic microwave background (CMB) with several small and large aperture telescopes, each outfitted with thousands to tens of thousands of superconducting aluminum manganese (AlMn) transition-edge sensor bolometers (TESs). In-situ characterization of TES responsivities and effective time constants will be required multiple times each observing-day for calibrating time-streams during CMB map-making. Effective time constants are typically estimated in the field by briefly applying small amplitude square-waves on top of the TES DC biases, and fitting exponential decays in the bolometer response. These so-called "bias step" measurements can be rapidly implemented across entire arrays and therefore are attractive because they take up little observing time. However, individual detector complex impedance measurements, while too slow to implement during observations, can provide a fuller picture of the TES model and a better understanding of its temporal response. Here, we present the results of dark TES characterization of many prototype SO bolometers and compare the effective thermal time constants measured via bias steps to those derived from complex impedance data. Comment: 10 pages, 6 figures, SPIE Astronomical Telescopes + Instrumentation 2020, Paper Number: 11453-185
Keywords	Astrophysics - Instrumentation and Methods for Astrophysics
Subject code	551
Publishing date	2020-12-15
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: The Atacama Cosmology Telescope

Mallaby-Kay, Maya / Atkins, Zachary / Aiola, Simone / Amodeo, Stefania / Austermann, Jason E. / Beall, James A. / Becker, Daniel T. / Bond, J. Richard / Calabrese, Erminia / Chesmore, Grace E. / Choi, Steve K. / Crowley, Kevin T. / Darwish, Omar / Denison, Edwawd V. / Devlin, Mark J. / Duff, Shannon M. / Duivenvoorden, Adriaan J. / Dunkley, Jo / Ferraro, Simone /

Fichman, Kyra / Gallardo, Patricio A. / Golec, Joseph E. / Guan, Yilun / Han, Dongwon / Hasselfield, Matthew / Hill, J. Colin / Hilton, Gene C. / Hilton, Matt / Hlozek, Renee / Hubmayr, Johannes / Huffenberger, Kevin M. / Hughes, John P. / Koopman, Brian J. / Louis, Thibaut / MacInnis, Amanda / Madhavacheril, Mathew S. / McMahon, Jeff / Moodley, Kavilan / Naess, Sigurd / Namikawa, Toshiya / Nati, Federico / Newburgh, Laura B. / Nibarger, John P. / Niemack, Michael D. / Page, Lyman A. / Salatino, Maria / Schaan, Emmanuel / Schillaci, Alessandro / Sehgal, Neelima / Sherwin, Blake D. / Sifon, Cristobal / Simon, Sara / Staggs, Suzanne T. / Storer, Emilie R. / Ullom, Joel N. / Van Engelen, Alexander / Van Lanen, Jeff / Vale, Leila R. / Wollack, Edward J. / Xu, Zhilei

Summary of DR4 and DR5 Data Products and Data Access

2021

Abstract: Two recent large data releases for the Atacama Cosmology Telescope (ACT), called DR4 and DR5, are available for public access. These data include temperature and polarization maps that cover nearly half the sky at arcminute resolution in three frequency ... ...

Abstract	Two recent large data releases for the Atacama Cosmology Telescope (ACT), called DR4 and DR5, are available for public access. These data include temperature and polarization maps that cover nearly half the sky at arcminute resolution in three frequency bands; lensing maps and component-separated maps covering ~ 2,100 deg^2 of sky; derived power spectra and cosmological likelihoods; a catalog of over 4,000 galaxy clusters; and supporting ancillary products including beam functions and masks. The data and products are described in a suite of ACT papers; here we provide a summary. In order to facilitate ease of access to these data we present a set of Jupyter IPython notebooks developed to introduce users to DR4, DR5, and the tools needed to analyze these data. The data products (excluding simulations) and the set of notebooks are publicly available on the NASA Legacy Archive for Microwave Background Data Analysis (LAMBDA); simulation products are available on the National Energy Research Scientific Computing Center (NERSC). Comment: Accepted to ApJS. 21 pages, 8 figures. Data and notebooks available on LAMBDA https://lambda.gsfc.nasa.gov/product/act/
Keywords	Astrophysics - Cosmology and Nongalactic Astrophysics
Subject code	306
Publishing date	2021-03-04
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Evidence of lensing of the cosmic microwave background by dark matter halos.

Madhavacheril, Mathew / Sehgal, Neelima / Allison, Rupert / Battaglia, Nick / Bond, J Richard / Calabrese, Erminia / Caligiuri, Jerod / Coughlin, Kevin / Crichton, Devin / Datta, Rahul / Devlin, Mark J / Dunkley, Joanna / Dünner, Rolando / Fogarty, Kevin / Grace, Emily / Hajian, Amir / Hasselfield, Matthew / Hill, J Colin / Hilton, Matt /

Physical review letters

2015 Volume 114, Issue 15, Page(s) 151302

Abstract: We present evidence of the gravitational lensing of the cosmic microwave background by 10(13) solar mass dark matter halos. Lensing convergence maps from the Atacama Cosmology Telescope Polarimeter (ACTPol) are stacked at the positions of around 12 000 ... ...

Abstract	We present evidence of the gravitational lensing of the cosmic microwave background by 10(13) solar mass dark matter halos. Lensing convergence maps from the Atacama Cosmology Telescope Polarimeter (ACTPol) are stacked at the positions of around 12 000 optically selected CMASS galaxies from the SDSS-III/BOSS survey. The mean lensing signal is consistent with simulated dark matter halo profiles and is favored over a null signal at 3.2σ significance. This result demonstrates the potential of microwave background lensing to probe the dark matter distribution in galaxy group and galaxy cluster halos.
Language	English
Publishing date	2015-04-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.114.151302
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Article ; Online: Evidence for dark energy from the cosmic microwave background alone using the Atacama Cosmology Telescope lensing measurements.

Sherwin, Blake D / Dunkley, Joanna / Das, Sudeep / Appel, John W / Bond, J Richard / Carvalho, C Sofia / Devlin, Mark J / Dünner, Rolando / Essinger-Hileman, Thomas / Fowler, Joseph W / Hajian, Amir / Halpern, Mark / Hasselfield, Matthew / Hincks, Adam D / Hlozek, Renée / Hughes, John P / Irwin, Kent D / Klein, Jeff / Kosowsky, Arthur /

Marriage, Tobias A / Marsden, Danica / Moodley, Kavilan / Menanteau, Felipe / Niemack, Michael D / Nolta, Michael R / Page, Lyman A / Parker, Lucas / Reese, Erik D / Schmitt, Benjamin L / Sehgal, Neelima / Sievers, Jon / Spergel, David N / Staggs, Suzanne T / Swetz, Daniel S / Switzer, Eric R / Thornton, Robert / Visnjic, Katerina / Wollack, Ed

Physical review letters

2011 Volume 107, Issue 2, Page(s) 21302

Abstract: For the first time, measurements of the cosmic microwave background radiation (CMB) alone favor cosmologies with w = -1 dark energy over models without dark energy at a 3.2-sigma level. We demonstrate this by combining the CMB lensing deflection power ... ...

Abstract	For the first time, measurements of the cosmic microwave background radiation (CMB) alone favor cosmologies with w = -1 dark energy over models without dark energy at a 3.2-sigma level. We demonstrate this by combining the CMB lensing deflection power spectrum from the Atacama Cosmology Telescope with temperature and polarization power spectra from the Wilkinson Microwave Anisotropy Probe. The lensing data break the geometric degeneracy of different cosmological models with similar CMB temperature power spectra. Our CMB-only measurement of the dark energy density Ω(Λ) confirms other measurements from supernovae, galaxy clusters, and baryon acoustic oscillations, and demonstrates the power of CMB lensing as a new cosmological tool.
Language	English
Publishing date	2011-07-08
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.107.021302
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Article ; Online: Detection of the power spectrum of cosmic microwave background lensing by the Atacama Cosmology Telescope.

Das, Sudeep / Sherwin, Blake D / Aguirre, Paula / Appel, John W / Bond, J Richard / Carvalho, C Sofia / Devlin, Mark J / Dunkley, Joanna / Dünner, Rolando / Essinger-Hileman, Thomas / Fowler, Joseph W / Hajian, Amir / Halpern, Mark / Hasselfield, Matthew / Hincks, Adam D / Hlozek, Renée / Huffenberger, Kevin M / Hughes, John P / Irwin, Kent D /

Physical review letters

2011 Volume 107, Issue 2, Page(s) 21301

Abstract: We report the first detection of the gravitational lensing of the cosmic microwave background through a measurement of the four-point correlation function in the temperature maps made by the Atacama Cosmology Telescope. We verify our detection by ... ...

Abstract	We report the first detection of the gravitational lensing of the cosmic microwave background through a measurement of the four-point correlation function in the temperature maps made by the Atacama Cosmology Telescope. We verify our detection by calculating the levels of potential contaminants and performing a number of null tests. The resulting convergence power spectrum at 2° angular scales measures the amplitude of matter density fluctuations on comoving length scales of around 100 Mpc at redshifts around 0.5 to 3. The measured amplitude of the signal agrees with Lambda cold dark matter cosmology predictions. Since the amplitude of the convergence power spectrum scales as the square of the amplitude of the density fluctuations, the 4σ detection of the lensing signal measures the amplitude of density fluctuations to 12%.
Language	English
Publishing date	2011-07-08
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.107.021301
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Evidence of galaxy cluster motions with the kinematic Sunyaev-Zel'dovich effect.

Hand, Nick / Addison, Graeme E / Aubourg, Eric / Battaglia, Nick / Battistelli, Elia S / Bizyaev, Dmitry / Bond, J Richard / Brewington, Howard / Brinkmann, Jon / Brown, Benjamin R / Das, Sudeep / Dawson, Kyle S / Devlin, Mark J / Dunkley, Joanna / Dunner, Rolando / Eisenstein, Daniel J / Fowler, Joseph W / Gralla, Megan B / Hajian, Amir /

Halpern, Mark / Hilton, Matt / Hincks, Adam D / Hlozek, Renée / Hughes, John P / Infante, Leopoldo / Irwin, Kent D / Kosowsky, Arthur / Lin, Yen-Ting / Malanushenko, Elena / Malanushenko, Viktor / Marriage, Tobias A / Marsden, Danica / Menanteau, Felipe / Moodley, Kavilan / Niemack, Michael D / Nolta, Michael R / Oravetz, Daniel / Page, Lyman A / Palanque-Delabrouille, Nathalie / Pan, Kaike / Reese, Erik D / Schlegel, David J / Schneider, Donald P / Sehgal, Neelima / Shelden, Alaina / Sievers, Jon / Sifón, Cristóbal / Simmons, Audrey / Snedden, Stephanie / Spergel, David N / Staggs, Suzanne T / Swetz, Daniel S / Switzer, Eric R / Trac, Hy / Weaver, Benjamin A / Wollack, Edward J / Yeche, Christophe / Zunckel, Caroline

Physical review letters

2012 Volume 109, Issue 4, Page(s) 41101

Abstract: Using high-resolution microwave sky maps made by the Atacama Cosmology Telescope, we for the first time present strong evidence for motions of galaxy clusters and groups via microwave background temperature distortions due to the kinematic Sunyaev-Zel' ... ...

Abstract	Using high-resolution microwave sky maps made by the Atacama Cosmology Telescope, we for the first time present strong evidence for motions of galaxy clusters and groups via microwave background temperature distortions due to the kinematic Sunyaev-Zel'dovich effect. Galaxy clusters are identified by their constituent luminous galaxies observed by the Baryon Oscillation Spectroscopic Survey, part of the Sloan Digital Sky Survey III. We measure the mean pairwise momentum of clusters, with a probability of the signal being due to random errors of 0.002, and the signal is consistent with the growth of cosmic structure in the standard model of cosmology.
Language	English
Publishing date	2012-07-27
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.109.041101
Database	MEDical Literature Analysis and Retrieval System OnLINE

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