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2. Effects of galaxy environment on merger fraction

Author

Pearson, W. J., Santos, D. J. D., Goto, T., Huang, T. -C., Kim, S. J., Matsuhara, H., Pollo, A., Ho, S. C. -C., Hwang, H. S., Małek, K., Nakagawa, T., Romano, M., Serjeant, S., Suelves, L., Shim, H., and White, G. J.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

Aims. In this work, we intend to examine how environment influences the merger fraction, from the low density field environment to higher density groups and clusters. We also aim to study how the properties of a group or cluster, as well as the position of a galaxy in the group or cluster, influences the merger fraction. Methods. We identified galaxy groups and clusters in the North Ecliptic Pole using a friends-of-friends algorithm and the local density. Once identified, we determined the central galaxies, group radii, velocity dispersions, and group masses of these groups and clusters. Merging systems were identified with a neural network as well as visually. With these, we examined how the merger fraction changes as the local density changes for all galaxies as well as how the merger fraction changes as the properties of the groups or clusters change. Results. We find that the merger fraction increases as local density increases and decreases as the velocity dispersion increases, as is often found in literature. A decrease in merger fraction as the group mass increases is also found. We also find groups with larger radii have higher merger fractions. The number of galaxies in a group does not influence the merger fraction. Conclusions. The decrease in merger fraction as group mass increases is a result of the link between group mass and velocity dispersion. Hence, this decrease of merger fraction with increasing mass is a result of the decrease of merger fraction with velocity dispersion. The increasing relation between group radii and merger fraction may be a result of larger groups having smaller velocity dispersion at a larger distance from the centre or larger groups hosting smaller, infalling groups with more mergers. However, we do not find evidence of smaller groups having higher merger fractions., Comment: 15 pages, 10 figures, 8 tables, 2 appendices, accepted for publication in Astronomy & Astrophysics

Published
2024
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4. Optical activity and transport in twisted bilayer graphene: the essence of spatial dispersion effects

Author

Ho, S. Ta and Do, V. Nam

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

This study investigates optical activity and quantum transport in twisted bilayer graphene (TBG) systems, demonstrating that the former results from spatial dispersion effects. The transfer matrix method is used to solve the propagation of electromagnetic waves through two graphene layers that act as the coupling surfaces of a dielectric slab. The resulting optical conductivity tensor is decomposed into a local and a drag part, with the drag transverse conductivity $\sigma_{xy}^{(drag)}$ governing the TBG system's optical property. An effective continuum model is employed to analyze electron state formation and calculate relevant parts of the optical conductivity tensor. Correlation of electron motions leads to incomplete cancellation and a finite $\sigma_{xy}^{(drag)}$ in the chiral TBG lattice. The study also calculates DC conductivity, showing TBG supports quantum conductivity proportional to $e^2/h$ at the intrinsic Fermi energy., Comment: arXiv admin note: substantial text overlap with arXiv:2205.12675

Published
2023
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5. Pitfalls of AI classification of rare objects: Galaxy Mergers

Author

Pearson, W. J., Suelves, L. E., Ho, S. C. -C., Oi, N., Team, NEP, and Team, GAMA

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

Galaxy mergers are hugely important in our current dark matter cosmology. These powerful events cause the disruption of the merging galaxies, pushing the gas, stars and dust of the galaxies resulting in changes to morphologies. This disruption can also cause more extreme events inside the galaxies: periods of extreme star formation rates and the rapid increase in active galactic nuclei activity. Hence, to better understand what goes on in these rare events, we need to be able to identify statistically large samples. In the last few years, the growth of artificial intelligence techniques has seen application to identifying galaxy mergers. These techniques have shown to be highly accurate and their application has grown beyond academic studies of ``can we?'' to deeper scientific use. However, these classifications are not without their problems. In this proceedings, we will explore how galaxy merger classification can be improved by adding pre-extracted galaxy morphologies alongside the traditional imaging data. This demonstrates that current neural networks are not extracting all the information from the images they are given. It will also explore how the resulting samples of rare objects could be highly contaminated. This has a knock on impact on the upcoming large scale surveys like Euclid and Rubin-LSST., Comment: 4 pages, 3 figures, proceedings for EAS 2022 S11, to be published in Memorie della SAIt

Published
2023

7. Chiral correlation of drag currents inducing optical activity of twisted bilayer graphene

Author

Ho, S. Ta and Do, V. Nam

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The mechanisms of optical activity and quantum transport of twisted bilayer graphene are studied. The formation of unique electron states in the bilayer systems is studied using an effective continuum model. Such states are shown to support the correlation of transverse motions of electrons in two graphene layers. Because of the chiral structure of the atomic lattices, the contribution of such drag correlations is incompletely cancelled, thus resulting in a drag term of the optical conductivity tensor. We show that the drag term of the conductivity is the manifestation of the spatial dispersion. We show how to analyze and calculate the components of the conductivity tensors that governs the optical activity of the systems. The DC conductivity of the twisted bilayer graphene system is also calculated. It shows the existence of a quantum conductivity value $\propto e^2/h$ at the intrinsic Fermi energy.

Published
2022

8. P025Mail-order pharmacy dispensing of mifepristone for medication abortion after in-person clinical assessment

Author

Grossman, D, Raifman, S, Morris, N, Biggs, MA, Arena, A, Bachrach, L, Beaman, J, Collins, A, Gold, M, Hannum, C, Ho, S, Middleton, T, Schwarz, EB, Tocce, K, Seibold-Simpson, S, Sobota, M, and Wohler, D

Subjects
Reproductive Medicine, Biomedical and Clinical Sciences, Clinical Research, Reproductive health and childbirth, Clinical Sciences, Paediatrics and Reproductive Medicine, Public Health and Health Services, Obstetrics & Reproductive Medicine, Clinical sciences, Reproductive medicine, Health services and systems
Published
2022

9. White Paper on Light Sterile Neutrino Searches and Related Phenomenology

Author

Acero, M. A., Argüelles, C. A., Hostert, M., Kalra, D., Karagiorgi, G., Kelly, K. J., Littlejohn, B., Machado, P., Pettus, W., Toups, M., Ross-Lonergan, M., Sousa, A., Surukuchi, P. T., Wong, Y. Y. Y., Abdallah, W., Abdullahi, A. M., Akutsu, R., Alvarez-Ruso, L., Alves, D. S. M., Aurisano, A., Balantekin, A. B., Berryman, J. M., Bertólez-Martínez, T., Brunner, J., Blennow, M., Bolognesi, S., Borusinski, M., Cianci, D., Collin, G., Conrad, J. M., Crow, B., Denton, P. B., Duvall, M., Fernández-Martinez, E., Fong, C. S., Foppiani, N., Forero, D. V., Friend, M., García-Soto, A., Giganti, C., Giunti, C., Gandhi, R., Ghosh, M., Hardin, J., Heeger, K. M., Ishitsuka, M., Izmaylov, A., Jones, B. J. P., Jordan, J. R., Kamp, N. W., Katori, T., Kim, S. B., Koerner, L. W., Lamoureux, M., Lasserre, T., Leach, K. G., Learned, J., Li, Y. F., Link, J. M., Louis, W. C., Mahn, K., Meyers, P. D., Maricic, J., Marko, D., Maruyama, T., Mertens, S., Minakata, H., Mocioiu, I., Mooney, M., Moulai, M. H., Nunokawa, H., Ochoa-Ricoux, J. P., Oh, Y. M., Ohlsson, T., Päs, H., Pershey, D., Robertson, R. G. H., Rosauro-Alcaraz, S., Rott, C., Roy, S., Salvado, J., Scott, M., Seo, S. H., Shaevitz, M. H., Smiley, M., Spitz, J., Stachurska, J., Thakore, T., Ternes, C. A., Thompson, A., Tseng, S., Vogelaar, B., Weiss, T., Wendell, R. A., Wright, T., Xin, Z., Yang, B. S., Yoo, J., Zennamo, J., Zettlemoyer, J., Zornoza, J. D., Ahmad, S., Basto-Gonzalez, V. S., Bowden, N. S., Cañas, B. C., Caratelli, D., Chang, C. V., Chen, C., Classen, T., Convery, M., Davies, G. S., Dennis, S. R., Djurcic, Z., Dorrill, R., Du, Y., Evans, J. J., Fahrendholz, U., Formaggio, J. A., Foust, B. T., Gatti, H. Frandini, Garcia-Gamez, D., Gariazzo, S., Gehrlein, J., Grant, C., Gomes, R. A., Hansell, A. B., Halzen, F., Ho, S., Zink, J. Hoefken, Jones, R. S., Kunkle, P., Li, J. -Y., Li, S. C., Luo, X., Malyshkin, Yu., Massaro, D., Mastbaum, A., Mohanta, R., Mumm, H. P., Nebot-Guinot, M., Neilson, R., Ni, K., Nieves, J., Gann, G. D. Orebi, Pandey, V., Pascoli, S., Qian, X., Rajaoalisoa, M., Roca, C., Roskovec, B., Saul-Sala, E., Saldaña, L., Scholberg, K., Shakya, B., Slocum, P. L., Snider, E. L., Steiger, H. Th. J., Steklain, A. F., Stock, M. R., Sutanto, F., Takhistov, V., Tsai, Y. -D., Tsai, Y. -T., Venegas-Vargas, D., Wallbank, M., Wang, E., Weatherly, P., Westerdale, S., Worcester, E., Wu, W., Yang, G., and Zamorano, B.

Subjects
High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract

This white paper provides a comprehensive review of our present understanding of experimental neutrino anomalies that remain unresolved, charting the progress achieved over the last decade at the experimental and phenomenological level, and sets the stage for future programmatic prospects in addressing those anomalies. It is purposed to serve as a guiding and motivational "encyclopedic" reference, with emphasis on needs and options for future exploration that may lead to the ultimate resolution of the anomalies. We see the main experimental, analysis, and theory-driven thrusts that will be essential to achieving this goal being: 1) Cover all anomaly sectors -- given the unresolved nature of all four canonical anomalies, it is imperative to support all pillars of a diverse experimental portfolio, source, reactor, decay-at-rest, decay-in-flight, and other methods/sources, to provide complementary probes of and increased precision for new physics explanations; 2) Pursue diverse signatures -- it is imperative that experiments make design and analysis choices that maximize sensitivity to as broad an array of these potential new physics signatures as possible; 3) Deepen theoretical engagement -- priority in the theory community should be placed on development of standard and beyond standard models relevant to all four short-baseline anomalies and the development of tools for efficient tests of these models with existing and future experimental datasets; 4) Openly share data -- Fluid communication between the experimental and theory communities will be required, which implies that both experimental data releases and theoretical calculations should be publicly available; and 5) Apply robust analysis techniques -- Appropriate statistical treatment is crucial to assess the compatibility of data sets within the context of any given model., Comment: Contribution to Snowmass 2021 by the NF02 Topical Group (Understanding Experimental Neutrino Anomalies). Submitted to J. Phys. G as a Major Report

Published
2022

10. North Ecliptic Pole merging galaxy catalogue

Author

Pearson, W. J., Suelves, L. E., Ho, S. C. -C., Oi, N., Brough, S., Holwerda, B. W., Hopkins, A. M., Huang, T. -C., Hwang, H. S., Kelvin, L. S., Kim, S. J., López-Sánchez, Á. R., Małek, K., Pearson, C., Poliszczuk, A., Pollo, A., Rodriguez-Gomez, V., Shim, H., Toba, Y., and Wang, L.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We aim to generate a catalogue of merging galaxies within the 5.4 sq. deg. North Ecliptic Pole over the redshift range $0.0 < z < 0.3$. To do this, imaging data from the Hyper Suprime-Cam are used along with morphological parameters derived from these same data. The catalogue was generated using a hybrid approach. Two neural networks were trained to perform binary merger non-merger classifications: one for galaxies with $z < 0.15$ and another for $0.15 \leq z < 0.30$. Each network used the image and morphological parameters of a galaxy as input. The galaxies that were identified as merger candidates by the network were then visually checked by experts. The resulting mergers will be used to calculate the merger fraction as a function of redshift and compared with literature results. We found that 86.3% of galaxy mergers at $z < 0.15$ and 79.0% of mergers at $0.15 \leq z < 0.30$ are expected to be correctly identified by the networks. Of the 34 264 galaxies classified by the neural networks, 10 195 were found to be merger candidates. Of these, 2109 were visually identified to be merging galaxies. We find that the merger fraction increases with redshift, consistent with literature results from observations and simulations, and that there is a mild star-formation rate enhancement in the merger population of a factor of $1.102 \pm 0.084$., Comment: Accepted to A&A, 26 pages, 20 figures, 8 tables, 3 appendixes, full tables 1 and 4 will be available on CDS

Published
2022
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12. Long-term open-label vebicorvir for chronic HBV infection: Safety and off-treatment responses

Author

Man-Fung Yuen, Scott Fung, Xiaoli Ma, Tuan T. Nguyen, Tarek Hassanein, Hie-Won Hann, Magdy Elkhashab, Ronald G. Nahass, James S. Park, Ira M. Jacobson, Walid S. Ayoub, Steven-Huy Han, Edward J. Gane, Katie Zomorodi, Ran Yan, Julie Ma, Steven J. Knox, Luisa M. Stamm, Maurizio Bonacini, Frank Weilert, Alnoor Ramji, Michael Bennett, Natarajan Ravendhran, Sing Chan, Douglas T. Dieterich, Paul Yien Kwo, Eugene R. Schiff, Ho S. Bae, Jacob Lalezari, Kosh Agarwal, and Mark S. Sulkowski

Subjects
Hepatitis, Core inhibitor, Antiviral, Off-treatment, Open-label, Nucleos(t)ide reverse transcriptase inhibitor, Diseases of the digestive system. Gastroenterology, RC799-869
Abstract

Background & Aims: The investigational first-generation core inhibitor vebicorvir (VBR) demonstrated safety and antiviral activity over 24 weeks in two phase IIa studies in patients with chronic HBV infection. In this long-term extension study, patients received open-label VBR with nucleos(t)ide reverse transcriptase inhibitors (NrtIs). Methods: Patients in this study (NCT03780543) previously received VBR + NrtI or placebo + NrtI in parent studies 201 (NCT03576066) or 202 (NCT03577171). After receiving VBR + NrtI for ≥52 weeks, stopping criteria (based on the treatment history and hepatitis B e antigen status in the parent studies) were applied, and patients either discontinued both VBR + NrtI, discontinued VBR only, or continued both VBR + NrtI. The primary efficacy endpoint was the proportion of patients with HBV DNA

Published
2024
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13. Optically-detected galaxy cluster candidates in the $AKARI$ North Ecliptic Pole field based on photometric redshift from Subaru Hyper Suprime-Cam

Author

Huang, T. -C., Matsuhara, H., Goto, T., Santos, D. J. D., Ho, S. C. -C., Kim, S. J., Hashimoto, T., Ikeda, Hiroyuki, Oi, Nagisa, Malkan, M. A., Pearson, W. J., Pollo, A., Serjeant, S., Shim, H., Miyaji, T., Hwang, H. S., Durkalec, A., Poliszczuk, A., Greve, T. R., Pearson, C., Toba, Y., Lee, D., Kim, H. K., Toft, S., Jeong, W. -S., and Enokidani, U.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Galaxy clusters provide an excellent probe in various research fields in astrophysics and cosmology. However, the number of galaxy clusters detected so far in the $AKARI$ North Ecliptic Pole (NEP) field is limited. In this work, we provide galaxy cluster candidates in the $AKARI$ NEP field with the minimum requisites based only on coordinates and photometric redshift (photo-$z$) of galaxies. We used galaxies detected in 5 optical bands ($g$, $r$, $i$, $z$, and $Y$) by the Subaru Hyper Suprime-Cam (HSC), assisted with $u$-band from Canada-France-Hawaii Telescope (CFHT) MegaPrime/MegaCam, and IRAC1 and IRAC2 bands from the $Spitzer$ space telescope for photo-$z$ estimation. We calculated the local density around every galaxy using the 10$^{th}$-nearest neighbourhood. Cluster candidates were determined by applying the friends-of-friends algorithm to over-densities. 88 cluster candidates containing 4390 member galaxies below redshift 1.1 in 5.4 deg$^2$ have been detected. The reliability of our method was examined through false detection tests, redshift uncertainty tests, and applications on the COSMOS data, giving false detection rates of 0.01 to 0.05 and recovery rate of 0.9 at high richness. 3 X-ray clusters previously observed by $ROSAT$ and $Chandra$ were recovered. The cluster galaxies show higher stellar mass and lower star formation rate (SFR) compared to the field galaxies in two-sample Z-tests. These cluster candidates are useful for environmental studies of galaxy evolution and future astronomical surveys in the NEP, where $AKARI$ has performed unique 9-band mid-infrared photometry for tens of thousands of galaxies., Comment: 19 pages, 16 figures, has been accepted for publication in MNRAS

Published
2021
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14. Long-term open-label vebicorvir for chronic HBV infection: Safety and off-treatment responses

Author

Yuen, Man-Fung, Fung, Scott, Ma, Xiaoli, Nguyen, Tuan T., Hassanein, Tarek, Hann, Hie-Won, Elkhashab, Magdy, Nahass, Ronald G., Park, James S., Jacobson, Ira M., Ayoub, Walid S., Han, Steven-Huy, Gane, Edward J., Zomorodi, Katie, Yan, Ran, Ma, Julie, Knox, Steven J., Stamm, Luisa M., Bonacini, Maurizio, Weilert, Frank, Ramji, Alnoor, Bennett, Michael, Ravendhran, Natarajan, Chan, Sing, Dieterich, Douglas T., Kwo, Paul Yien, Schiff, Eugene R., Bae, Ho S., Lalezari, Jacob, Agarwal, Kosh, and Sulkowski, Mark S.

Published
2024
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16. POSTER ABSTRACTS P2 FEASIBILITY, ACCEPTABILITY, AND EFFECTIVENESS OF MAIL-ORDER PHARMACY DISPENSING OF MIFEPRISTONE FOR MEDICATION ABORTION

Author

Grossman, D, Raifman, S, Morris, N, Arena, A, Bachrach, LR, Beaman, J, Biggs, MA, Hannum, C, Ho, S, Schwarz, EB, and Gold, M

Subjects
Health Services and Systems, Health Sciences, Clinical Sciences, Paediatrics and Reproductive Medicine, Public Health and Health Services, Obstetrics & Reproductive Medicine, Clinical sciences, Reproductive medicine, Health services and systems
Published
2021

17. The Atacama Cosmology Telescope: A Catalog of > 4000 Sunyaev-Zel'dovich Galaxy Clusters

Author

Hilton, M., Sifón, C., Naess, S., Madhavacheril, M., Oguri, M., Rozo, E., Rykoff, E., Abbott, T. M. C., Adhikari, S., Aguena, M., Aiola, S., Allam, S., Amodeo, S., Amon, A., Annis, J., Ansarinejad, B., Aros-Bunster, C., Austermann, J. E., Avila, S., Bacon, D., Battaglia, N., Beall, J. A., Becker, D. T., Bernstein, G. M., Bertin, E., Bhandarkar, T., Bhargava, S., Bond, J. R., Brooks, D., Burke, D. L., Calabrese, E., Carretero, J., Choi, S. K., Choi, A., Conselice, C., da Costa, L. N., Costanzi, M., Crichton, D., Crowley, K. T., Dünner, R., Denison, E. V., Devlin, M. J., Dicker, S. R., Diehl, H. T., Dietrich, J. P., Doel, P., Duff, S. M., Duivenvoorden, A. J., Dunkley, J., Everett, S., Ferraro, S., Ferrero, I., Ferté, A., Flaugher, B., Frieman, J., Gallardo, P. A., García-Bellido, J., Gaztanaga, E., Gerdes, D. W., Giles, P., Golec, J. E., Gralla, M. B., Grandis, S., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Han, D., Hartley, W. G., Hasselfield, M., Hill, J. C., Hilton, G. C., Hincks, A. D., Hinton, S. R., Ho, S-P. P., Honscheid, K., Hoyle, B., Hubmayr, J., Huffenberger, K. M., Hughes, J. P., Jaelani, A. T., Jain, B., James, D. J., Jeltema, T., Kent, S., Kind, M. Carrasco, Knowles, K., Koopman, B. J., Kuehn, K., Lahav, O., Lima, M., Lin, Y-T., Lokken, M., Loubser, S. I., MacCrann, N., Maia, M. A. G., Marriage, T. A., Martin, J., McMahon, J., Melchior, P., Menanteau, F., Miquel, R., Miyatake, H., Moodley, K., Morgan, R., Mroczkowski, T., Nati, F., Newburgh, L. B., Niemack, M. D., Nishizawa, A. J., Ogando, R. L. C., Orlowski-Scherer, J., Page, L. A., Palmese, A., Partridge, B., Paz-Chinchón, F., Phakathi, P., Plazas, A. A., Robertson, N. C., Romer, A. K., Rosell, A. Carnero, Salatino, M., Sanchez, E., Schaan, E., Schillaci, A., Sehgal, N., Serrano, S., Shin, T., Simon, S. M., Smith, M., Soares-Santos, M., Spergel, D. N., Staggs, S. T., Storer, E. R., Suchyta, E., Swanson, M. E. C., Tarle, G., Thomas, D., To, C., Trac, H., Ullom, J. N., Vale, L. R., Van Lanen, J., Vavagiakis, E. M., De Vicente, J., Wilkinson, R. D., Wollack, E. J., Xu, Z., and Zhang, Y.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present a catalog of 4195 optically confirmed Sunyaev-Zel'dovich (SZ) selected galaxy clusters detected with signal-to-noise > 4 in 13,211 deg$^2$ of sky surveyed by the Atacama Cosmology Telescope (ACT). Cluster candidates were selected by applying a multi-frequency matched filter to 98 and 150 GHz maps constructed from ACT observations obtained from 2008-2018, and confirmed using deep, wide-area optical surveys. The clusters span the redshift range 0.04 < z < 1.91 (median z = 0.52). The catalog contains 222 z > 1 clusters, and a total of 868 systems are new discoveries. Assuming an SZ-signal vs. mass scaling relation calibrated from X-ray observations, the sample has a 90% completeness mass limit of M500c > 3.8 x 10$^{14}$ MSun, evaluated at z = 0.5, for clusters detected at signal-to-noise ratio > 5 in maps filtered at an angular scale of 2.4'. The survey has a large overlap with deep optical weak-lensing surveys that are being used to calibrate the SZ-signal mass-scaling relation, such as the Dark Energy Survey (4566 deg$^2$), the Hyper Suprime-Cam Subaru Strategic Program (469 deg$^2$), and the Kilo Degree Survey (825 deg$^2$). We highlight some noteworthy objects in the sample, including potentially projected systems; clusters with strong lensing features; clusters with active central galaxies or star formation; and systems of multiple clusters that may be physically associated. The cluster catalog will be a useful resource for future cosmological analyses, and studying the evolution of the intracluster medium and galaxies in massive clusters over the past 10 Gyr., Comment: 35 pages, 27 figures, accepted for publication in ApJS; v1.0 catalogs will be available from LAMBDA https://lambda.gsfc.nasa.gov/product/act/actpol_prod_table.cfm; v1.0 catalogs available from https://astro.ukzn.ac.za/~mjh/ACTDR5/v1.0/ until then

Published
2020
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18. New Interpretable Statistics for Large Scale Structure Analysis and Generation

Author

Allys, E., Marchand, T., Cardoso, J. -F., Villaescusa-Navarro, F., Ho, S., and Mallat, S.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We introduce Wavelet Phase Harmonics (WPH) statistics: interpretable low-dimensional statistics that describe 2D non-Gaussian fields. These statistics are built from WPH moments, which were recently introduced in the data science and machine learning community. We apply WPH statistics to projected 2D matter density fields from the Quijote N-body simulations of the large-scale structure of the Universe. By computing Fisher information matrices, we find that the WPH statistics place more stringent constraints on four of five cosmological parameters when compared to statistics based on the combination of the power spectrum and bispectrum. We also use the WPH statistics with a maximum entropy model to statistically generate new 2D density fields that accurately reproduce the probability density function, the mean and standard deviation of the power spectrum, the bispectrum, and Minkowski functionals of the input density fields. Although other methods are efficient for either parameter estimates or statistical syntheses of the large-scale structure, WPH statistics are the first statistics that achieve state-of-the-art results for both tasks as well as being interpretable., Comment: 21 pages, accepted in PRD. New version with clarified explanations

Published
2020
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19. The Atacama Cosmology Telescope: A Catalog of >4000 Sunyaev–Zel’dovich Galaxy Clusters

Author

Hilton, M, Sifón, C, Naess, S, Madhavacheril, M, Oguri, M, Rozo, E, Rykoff, E, Abbott, TMC, Adhikari, S, Aguena, M, Aiola, S, Allam, S, Amodeo, S, Amon, A, Annis, J, Ansarinejad, B, Aros-Bunster, C, Austermann, JE, Avila, S, Bacon, D, Battaglia, N, Beall, JA, Becker, DT, Bernstein, GM, Bertin, E, Bhandarkar, T, Bhargava, S, Bond, JR, Brooks, D, Burke, DL, Calabrese, E, Kind, M Carrasco, Carretero, J, Choi, SK, Choi, A, Conselice, C, da Costa, LN, Costanzi, M, Crichton, D, Crowley, KT, Dünner, R, Denison, EV, Devlin, MJ, Dicker, SR, Diehl, HT, Dietrich, JP, Doel, P, Duff, SM, Duivenvoorden, AJ, Dunkley, J, Everett, S, Ferraro, S, Ferrero, I, Ferté, A, Flaugher, B, Frieman, J, Gallardo, PA, García-Bellido, J, Gaztanaga, E, Gerdes, DW, Giles, P, Golec, JE, Gralla, MB, Grandis, S, Gruen, D, Gruendl, RA, Gschwend, J, Gutierrez, G, Han, D, Hartley, WG, Hasselfield, M, Hill, JC, Hilton, GC, Hincks, AD, Hinton, SR, Ho, S-PP, Honscheid, K, Hoyle, B, Hubmayr, J, Huffenberger, KM, Hughes, JP, Jaelani, AT, Jain, B, James, DJ, Jeltema, T, Kent, S, Knowles, K, Koopman, BJ, Kuehn, K, Lahav, O, Lima, M, Lin, Y-T, Lokken, M, Loubser, SI, MacCrann, N, Maia, MAG, Marriage, TA, Martin, J, McMahon, J, and Melchior, P

Subjects
Astronomical Sciences, Physical Sciences, Galaxy clusters, Cosmology, Large-scale structure of the universe, astro-ph.CO, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences
Abstract

We present a catalog of 4195 optically confirmed Sunyaev–Zel’dovich (SZ) selected galaxy clusters detected with signal-to-noise ratio >4 in 13,211 deg2 of sky surveyed by the Atacama Cosmology Telescope (ACT). Cluster candidates were selected by applying a multifrequency matched filter to 98 and 150 GHz maps constructed from ACT observations obtained from 2008 to 2018 and confirmed using deep, wide-area optical surveys. The clusters span the redshift range 0.04 < z < 1.91 (median z = 0.52). The catalog contains 222 z > 1 clusters, and a total of 868 systems are new discoveries. Assuming an SZ signal versus mass-scaling relation calibrated from X-ray observations, the sample has a 90% completeness mass limit of M500c > 3.8 × 1014 Me, evaluated at z = 0.5, for clusters detected at signal-to-noise ratio >5 in maps filtered at an angular scale of 2 4. The survey has a large overlap with deep optical weak-lensing surveys that are being used to calibrate the SZ signal mass-scaling relation, such as the Dark Energy Survey (4566 deg2), the Hyper Suprime-Cam Subaru Strategic Program (469 deg2), and the Kilo Degree Survey (825 deg2). We highlight some noteworthy objects in the sample, including potentially projected systems, clusters with strong lensing features, clusters with active central galaxies or star formation, and systems of multiple clusters that may be physically associated. The cluster catalog will be a useful resource for future cosmological analyses and studying the evolution of the intracluster medium and galaxies in massive clusters over the past 10 Gyr.

Published
2021

20. WFIRST: The Essential Cosmology Space Observatory for the Coming Decade

Author

Doré, O., Hirata, C., Wang, Y., Weinberg, D., Eifler, T., Foley, R. J., Heinrich, C. He, Krause, E., Perlmutter, S., Pisani, A., Scolnic, D., Spergel, D. N., Suntzeff, N., Aldering, G., Baltay, C., Capak, P., Choi, A., Deustua, S., Dvorkin, C., Fall, S. M., Fang, X., Fruchter, A., Galbany, L., Ho, S., Hounsell, R., Izard, A., Jain, B., Koekemoer, A. M., Kruk, J., Leauthaud, A., Malhotra, S., Mandelbaum, R., Massara, E., Masters, D., Miyatake, H., Plazas, A., Rhoads, J., Rhodes, J., Rose, B., Rubin, D., Sako, M., Samushia, L., Shirasaki, M., Simet, M., Takada, M., Troxel, M. A., Wu, H., Yoshida, N., and Zhai, Z.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Two decades after its discovery, cosmic acceleration remains the most profound mystery in cosmology and arguably in all of physics. Either the Universe is dominated by a form of dark energy with exotic physical properties not predicted by standard model physics, or General Relativity is not an adequate description of gravity over cosmic distances. WFIRST emerged as a top priority of Astro2010 in part because of its ability to address the mystery of cosmic acceleration through both high precision measurements of the cosmic expansion history and the growth of cosmic structures with multiple and redundant probes. We illustrate in this white paper how mission design changes since Astro2010 have made WFIRST an even more powerful dark energy facility and have improved the ability of WFIRST to respond to changes in the experimental landscape. WFIRST is the space-based probe of DE the community needs in the mid-2020s., Comment: 7 pages, 2 figures, Astro2020 Science White Paper

Published
2019

21. Astro2020 Science White Paper: Science at the edges: internal kinematics of globular clusters' external fields

Author

Bellini, A., Libralato, M., Anderson, J., Bennett, D., Calamida, A., Casertano, S., Fall, S. M., Gaudi, B. S., Guhathakurta, P., Ho, S., Lu, J., Malhotra, S., Melchior, P., Nelan, E., Rhodes, J., Sanderson, R. E., Shao, M., Sohn, S. T., Vesperini, E., and van der Marel, R. P.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

The outer regions of globular clusters can enable us to answer many fundamental questions concerning issues ranging from the formation and evolution of clusters and their multiple stellar populations to the study of stars near and beyond the hydrogen-burning limit and to the dynamics of the Milky Way. The outskirts of globular clusters are still uncharted territories observationally. A very efficient way to explore them is through high-precision proper motions of low-mass stars over a large field of view. The Wide Field InfraRed Survey Telescope (WFIRST) combines all these characteristics in a single telescope, making it the best observational tool to uncover the wealth of information contained in the clusters' outermost regions., Comment: 8 pages, 3 figures

Published
2019

22. Measurement of the Splashback Feature around SZ-selected Galaxy Clusters with DES, SPT and ACT

Author

Shin, T., Adhikari, S., Baxter, E. J., Chang, C., Jain, B., Battaglia, N., Bleem, L., Bocquet, S., DeRose, J., Gruen, D., Hilton, M., Kravtsov, A., McClintock, T., Rozo, E., Rykoff, E. S., Varga, T. N., Wechsler, R. H., Wu, H., Aiola, S., Allam, S., Bechtol, K., Benson, B. A., Bertin, E., Bond, J. R., Brodwin, M., Brooks, D., Buckley-Geer, E., Burke, D. L., Carlstrom, J. E., Rosell, A. Carnero, Kind, M. Carrasco, Carretero, J., Castander, F. J., Choi, S. K., Cunha, C. E., Crawford, T. M., da Costa, L. N., De Vicente, J., Desai, S., Devlin, M. J., Dietrich, J. P., Doel, P., Dunkley, J., Eifler, T. F., Evrard, A. E., Flaugher, B., Fosalba, P., Gallardo, P. A., García-Bellido, J., Gaztanaga, E., Gerdes, D. W., Gralla, M., Gruendl, R. A., Gschwend, J., Gupta, N., Gutierrez, G., Hartley, W. G., Hill, J. C., Ho, S. P., Hollowood, D. L., Honscheid, K., Hoyle, B., Huffenberger, K., Hughes, J. P., James, D. J., Jeltema, T., Kim, A. G., Krause, E., Kuehn, K., Lahav, O., Lima, M., Madhavacheril, M. S., Maia, M. A. G., Marshall, J. L., Maurin, L., McMahon, J., Menanteau, F., Miller, C. J., Miquel, R., Mohr, J. J., Naess, S., Nati, F., Newburgh, L., Niemack, M. D., Ogando, R. L. C., Partridge, L. A. Page B., Patil, S., Plazas, A. A., Rapetti, D., Reichardt, C. L., Romer, A. K., Sanchez, E., Scarpine, V., Schindler, R., Serrano, S., Smith, M., Smith, R. C., Soares-Santos, M., Sobreira, F., Staggs, S. T., Stark, A., Stein, G., Suchyta, E., Swanson, M. E. C., Tarle, G., Thomas, D., van Engelen, A., Wollack, E. J., Xu, Z., and Zhang, Z.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies
Abstract

We present a detection of the splashback feature around galaxy clusters selected using their Sunyaev-Zel'dovich (SZ) signal. Recent measurements of the splashback feature around optically selected galaxy clusters have found that the splashback radius, $r_{\rm sp}$, is smaller than predicted by N-body simulations. A possible explanation for this discrepancy is that $r_{\rm sp}$ inferred from the observed radial distribution of galaxies is affected by selection effects related to the optical cluster-finding algorithms. We test this possibility by measuring the splashback feature in clusters selected via the SZ effect in data from the South Pole Telescope SZ survey and the Atacama Cosmology Telescope Polarimeter survey. The measurement is accomplished by correlating these clusters with galaxies detected in the Dark Energy Survey Year 3 data. The SZ observable used to select clusters in this analysis is expected to have a tighter correlation with halo mass and to be more immune to projection effects and aperture-induced biases than optically selected clusters. We find that the measured $r_{\rm sp}$ for SZ-selected clusters is consistent with the expectations from simulations, although the small number of SZ-selected clusters makes a precise comparison difficult. In agreement with previous work, when using optically selected redMaPPer clusters, $r_{\rm sp}$ is $\sim$ $2\sigma$ smaller than in the simulations. These results motivate detailed investigations of selection biases in optically selected cluster catalogs and exploration of the splashback feature around larger samples of SZ-selected clusters. Additionally, we investigate trends in the galaxy profile and splashback feature as a function of galaxy color, finding that blue galaxies have profiles close to a power law with no discernible splashback feature, which is consistent with them being on their first infall into the cluster., Comment: 17 pages, 13 figures, published in MNRAS

Published
2018
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26. Cold optical design for the Large Aperture Simons Observatory telescope

Author

Dicker, S. R., Gallardo, P. A., Gudmundsson, J. E, Mauskopf, P. D., Ali, A., Ashton, P. C., Coppi, G., Devlin, M. J., Galitzki, N., Ho, S. P., Hill, C. A., Hubmayr, J., Keating, B., Lee, A. T., Limon, M., Matsuda, F., McMahon, J., Niemack, M. D., Orlowski-Scherer, J. L., Piccirillo, L., Salatino, M., Simon, S. M., Staggs, S. T., Thornton, R., Ullom, J. N., Vavagiakis, E. M., Wollack, E. J., Xu, Z., and Zhu, N.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Simons Observatory will consist of a single large (6 m diameter) telescope and a number of smaller (0.5 m diameter) refracting telescopes designed to measure the polarization of the Cosmic Microwave Background to unprecedented accuracy. The large aperture telescope is the same design as the CCAT-prime telescope, a modified Crossed Dragone design with a field-of-view of over 7.8 degrees diameter at 90 GHz. This paper presents an overview of the cold reimaging optics for this telescope and what drove our choice of 350-400 mm diameter silicon lenses in a 2.4 m cryostat over other possibilities. We will also consider the future expandability of this design to CMB Stage-4 and beyond.

Published
2018

27. Safety and efficacy of vebicorvir administered with entecavir in treatment-naïve patients with chronic hepatitis B virus infection

Author

Sulkowski, Mark S., Agarwal, Kosh, Ma, Xiaoli, Nguyen, Tuan T., Schiff, Eugene R., Hann, Hie-Won L., Dieterich, Douglas T., Nahass, Ronald G., Park, James S., Chan, Sing, Han, Steven-Huy B., Gane, Edward J., Bennett, Michael, Alves, Katia, Evanchik, Marc, Yan, Ran, Huang, Qi, Lopatin, Uri, Colonno, Richard, Ma, Julie, Knox, Steven J., Stamm, Luisa M., Bonacini, Maurizio, Jacobson, Ira M., Ayoub, Walid S., Weilert, Frank, Ravendhran, Natarajan, Ramji, Alnoor, Kwo, Paul Yien, Elkhashab, Magdy, Hassanein, Tarek, Bae, Ho S., Lalezari, Jacob P., Fung, Scott K., and Yuen, Man-Fung

Published
2022
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28. Probing gravitational lensing of the CMB with SDSS-IV quasars

Author

Han, J, Ferraro, S, Giusarma, E, and Ho, S

Subjects
quasars: general, cosmic background radiation, large-scale structure of Universe, astro-ph.CO, Astronomical and Space Sciences, Astronomy & Astrophysics
Abstract

We study the cross-correlation between the Planck cosmic microwave background (CMB) lensing convergence map and the extended-Baryon Oscillation Spectroscopic Survey (e-BOSS) quasar overdensity obtained from the Sloan Digital Sky Survey (SDSS) IV, in the redshift range 0.9 < z < 2.2. We detect the CMB lensing convergence–quasar cross-power spectrum at 5.4σ significance. The cross-power spectrum provides a quasar clustering bias measurement that is expected to be particularly robust against systematic effects. The redshift distribution of the quasar sample has a median redshift z ≈ 1.55, and an effective redshift about 1.51. The best-fitting bias of the quasar sample is b q = 2.43 ± 0.45, corresponding to a host halo mass of log 10 h − 1MM = 12.54 +−00 .. 2536 . This is broadly consistent with the previous literature on quasars with a similar redshift range and selection. Since our constraint on the bias comes from the cross-correlation between quasars and CMB lensing, we expect it to be robust to a wide range of possible systematic effects that may contaminate the autocorrelation of quasars. We checked for a number of systematic effects from both CMB lensing and quasar overdensity, and found that all systematics are consistent with null within 2σ. The data are not sensitive to a possible scale dependence of the bias at present, but we expect that as the number of quasars increases [in future surveys such as Dark Energy Spectroscopic Instrument (DESI)], it is likely that strong constraints on the scale dependence of the bias can be obtained.

Published
2019

29. Scale-dependent galaxy bias, CMB lensing-galaxy cross-correlation, and neutrino masses

Author

Giusarma, E, Vagnozzi, S, Ho, S, Ferraro, S, Freese, K, Kamen-Rubio, R, and Luk, KB

Subjects
astro-ph.CO, astro-ph.GA, astro-ph.HE, gr-qc, hep-ph
Abstract

One of the most powerful cosmological data sets when it comes to constraining neutrino masses is represented by galaxy power spectrum measurements, Pgg(k). The constraining power of Pgg(k) is however severely limited by uncertainties in the modeling of the scale-dependent galaxy bias b(k). In this work we present a new proof-of-principle for a method to constrain b(k) by using the cross-correlation between the cosmic microwave background (CMB) lensing signal and galaxy maps (C κg) using a simple but theoretically well-motivated parametrization for b(k). We apply the method using C κg measured by cross-correlating Planck lensing maps and the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 11 (DR11) CMASS galaxy sample, and Pgg(k) measured from the BOSS DR12 CMASS sample. We detect a nonzero scale-dependence at moderate significance, which suggests that a proper modeling of b(k) is necessary in order to reduce the impact of nonlinearities and minimize the corresponding systematics. The accomplished increase in constraining power of Pgg(k) is demonstrated by determining a 95% confidence level upper bound on the sum of the three active neutrino masses Mν of Mν

Published
2018

31. Safety and efficacy of vebicorvir in virologically suppressed patients with chronic hepatitis B virus infection

Author

Yuen, Man-Fung, Agarwal, Kosh, Ma, Xiaoli, Nguyen, Tuan T., Schiff, Eugene R., Hann, Hie-Won L., Dieterich, Douglas T., Nahass, Ronald G., Park, James S., Chan, Sing, Han, Steven-Huy B., Gane, Edward J., Bennett, Michael, Alves, Katia, Evanchik, Marc, Yan, Ran, Huang, Qi, Lopatin, Uri, Colonno, Richard, Ma, Julie, Knox, Steven J., Stamm, Luisa M., Bonacini, Maurizio, Jacobson, Ira M., Ayoub, Walid S., Weilert, Frank, Ravendhran, Natarajan, Ramji, Alnoor, Kwo, Paul Yien, Elkhashab, Magdy, Hassanein, Tarek, Bae, Ho S., Lalezari, Jacob P., Fung, Scott K., and Sulkowski, Mark S.

Published
2022
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32. Evaluation of prognostic risk models for postoperative pulmonary complications in adult patients undergoing major abdominal surgery: a systematic review and international external validation cohort study

Author

Kouli, O, Murray, V, Bhatia, S, Cambridge, WA, Kawka, M, Shafi, S, Knight, SR, Kamarajah, SK, McLean, KA, Glasbey, JC, Khaw, RA, Ahmed, W, Akhbari, M, Baker, D, Borakati, A, Mills, E, Thavayogan, R, Yasin, I, Raubenheimer, K, Ridley, W, Sarrami, M, Zhang, G, Egoroff, N, Pockney, P, Richards, T, Bhangu, A, Creagh-Brown, B, Edwards, M, Harrison, EM, Lee, M, Nepogodiev, D, Pinkney, T, Pearse, R, Smart, N, Vohra, R, Sohrabi, C, Jamieson, A, Nguyen, M, Rahman, A, English, C, Tincknell, L, Kakodkar, P, Kwek, I, Punjabi, N, Burns, J, Varghese, S, Erotocritou, M, McGuckin, S, Vayalapra, S, Dominguez, E, Moneim, J, Salehi, M, Tan, HL, Yoong, A, Zhu, L, Seale, B, Nowinka, Z, Patel, N, Chrisp, B, Harris, J, Maleyko, I, Muneeb, F, Gough, M, James, CE, Skan, O, Chowdhury, A, Rebuffa, N, Khan, H, Down, B, Fatimah Hussain, Q, Adams, M, Bailey, A, Cullen, G, Fu, YXJ, McClement, B, Taylor, A, Aitken, S, Bachelet, B, Brousse de Gersigny, J, Chang, C, Khehra, B, Lahoud, N, Lee Solano, M, Louca, M, Rozenbroek, P, Rozitis, E, Agbinya, N, Anderson, E, Arwi, G, Barry, I, Batchelor, C, Chong, T, Choo, LY, Clark, L, Daniels, M, Goh, J, Handa, A, Hanna, J, Huynh, L, Jeon, A, Kanbour, A, Lee, A, Lee, J, Lee, T, Leigh, J, Ly, D, McGregor, F, Moss, J, Nejatian, M, O'Loughlin, E, Ramos, I, Sanchez, B, Shrivathsa, A, Sincari, A, Sobhi, S, Swart, R, Trimboli, J, Wignall, P, Bourke, E, Chong, A, Clayton, S, Dawson, A, Hardy, E, Iqbal, R, Le, L, Mao, S, Marinelli, I, Metcalfe, H, Panicker, D, R, HH, Ridgway, S, Tan, HH, Thong, S, Van, M, Woon, S, Woon-Shoo-Tong, XS, Yu, S, Ali, K, Chee, J, Chiu, C, Chow, YW, Duller, A, Nagappan, P, Ng, S, Selvanathan, M, Sheridan, C, Temple, M, Do, JE, Dudi-Venkata, NN, Humphries, E, Li, L, Mansour, LT, Massy-Westropp, C, Fang, B, Farbood, K, Hong, H, Huang, Y, Joan, M, Koh, C, Liu, YHA, Mahajan, T, Muller, E, Park, R, Tanudisastro, M, Wu, JJG, Chopra, P, Giang, S, Radcliffe, S, Thach, P, Wallace, D, Wilkes, A, Chinta, SH, Li, J, Phan, J, Rahman, F, Segaran, A, Shannon, J, Zhang, M, Adams, N, Bonte, A, Choudhry, A, Colterjohn, N, Croyle, JA, Donohue, J, Feighery, A, Keane, A, McNamara, D, Munir, K, Roche, D, Sabnani, R, Seligman, D, Sharma, S, Stickney, Z, Suchy, H, Tan, R, Yordi, S, Ahmed, I, Aranha, M, El Sabawy, D, Garwood, P, Harnett, M, Holohan, R, Howard, R, Kayyal, Y, Krakoski, N, Lupo, M, McGilberry, W, Nepon, H, Scoleri, Y, Urbina, C, Ahmad Fuad, MF, Ahmed, O, Jaswantlal, D, Kelly, E, Khan, MHT, Naidu, D, Neo, WX, O'Neill, R, Sugrue, M, Abbas, JD, Abdul-Fattah, S, Azlan, A, Barry, K, Idris, NS, Kaka, N, Mc Dermott, D, Mohammad Nasir, MN, Mozo, M, Rehal, A, Shaikh Yousef, M, Wong, RH, Curran, E, Gardner, M, Hogan, A, Julka, R, Lasser, G, Ní Chorráin, N, Ting, J, Browne, R, George, S, Janjua, Z, Leung Shing, V, Megally, M, Murphy, S, Ravenscroft, L, Vedadi, A, Vyas, V, Bryan, A, Sheikh, A, Ubhi, J, Vannelli, K, Vawda, A, Adeusi, L, Doherty, C, Fitzgerald, C, Gallagher, H, Gill, P, Hamza, H, Hogan, M, Kelly, S, Larry, J, Lynch, P, Mazeni, NA, O'Connell, R, O'Loghlin, R, Singh, K, Abbas Syed, R, Ali, A, Alkandari, B, Arnold, A, Arora, E, Azam, R, Breathnach, C, Cheema, J, Compton, M, Curran, S, Elliott, JA, Jayasamraj, O, Mohammed, N, Noone, A, Pal, A, Pandey, S, Quinn, P, Sheridan, R, Siew, L, Tan, EP, Tio, SW, Toh, VTR, Walsh, M, Yap, C, Yassa, J, Young, T, Agarwal, N, Almoosawy, SA, Bowen, K, Bruce, D, Connachan, R, Cook, A, Daniell, A, Elliott, M, Fung, HKF, Irving, A, Laurie, S, Lee, YJ, Lim, ZX, Maddineni, S, McClenaghan, RE, Muthuganesan, V, Ravichandran, P, Roberts, N, Shaji, S, Solt, S, Toshney, E, Arnold, C, Baker, O, Belais, F, Bojanic, C, Byrne, M, Chau, CYC, De Soysa, S, Eldridge, M, Fairey, M, Fearnhead, N, Guéroult, A, Ho, JSY, Joshi, K, Kadiyala, N, Khalid, S, Khan, F, Kumar, K, Lewis, E, Magee, J, Manetta-Jones, D, Mann, S, McKeown, L, Mitrofan, C, Mohamed, T, Monnickendam, A, Ng, AYKC, Ortu, A, Patel, M, Pope, T, Pressling, S, Purohit, K, Saji, S, Shah Foridi, J, Shah, R, Siddiqui, SS, Surman, K, Utukuri, M, Varghese, A, Williams, CYK, Yang, JJ, Billson, E, Cheah, E, Holmes, P, Hussain, S, Murdock, D, Nicholls, A, Patel, P, Ramana, G, Saleki, M, Spence, H, Thomas, D, Yu, C, Abousamra, M, Brown, C, Conti, I, Donnelly, A, Durand, M, French, N, Goan, R, O'Kane, E, Rubinchik, P, Gardiner, H, Kempf, B, Lai, YL, Matthews, H, Minford, E, Rafferty, C, Reid, C, Sheridan, N, Al Bahri, T, Bhoombla, N, Rao, BM, Titu, L, Chatha, S, Field, C, Gandhi, T, Gulati, R, Jha, R, Jones Sam, MT, Karim, S, Patel, R, Saunders, M, Sharma, K, Abid, S, Heath, E, Kurup, D, Patel, A, Ali, M, Cresswell, B, Felstead, D, Jennings, K, Kaluarachchi, T, Lazzereschi, L, Mayson, H, Miah, JE, Reinders, B, Rosser, A, Thomas, C, Williams, H, Al-Hamid, Z, Alsadoun, L, Chlubek, M, Fernando, P, Gaunt, E, Gercek, Y, Maniar, R, Ma, R, Matson, M, Moore, S, Morris, A, Nagappan, PG, Ratnayake, M, Rockall, L, Shallcross, O, Sinha, A, Tan, KE, Virdee, S, Wenlock, R, Donnelly, HA, Ghazal, R, Hughes, I, Liu, X, McFadden, M, Misbert, E, Mogey, P, O'Hara, A, Peace, C, Rainey, C, Raja, P, Salem, M, Salmon, J, Tan, CH, Alves, D, Bahl, S, Baker, C, Coulthurst, J, Koysombat, K, Linn, T, Rai, P, Sharma, A, Shergill, A, Ahmed, M, Ahmed, S, Belk, LH, Choudhry, H, Cummings, D, Dixon, Y, Dobinson, C, Edwards, J, Flint, J, Franco Da Silva, C, Gallie, R, Gardener, M, Glover, T, Greasley, M, Hatab, A, Howells, R, Hussey, T, Khan, A, Mann, A, Morrison, H, Ng, A, Osmond, R, Padmakumar, N, Pervaiz, F, Prince, R, Qureshi, A, Sawhney, R, Sigurdson, B, Stephenson, L, Vora, K, Zacken, A, Cope, P, Di Traglia, R, Ferarrio, I, Hackett, N, Healicon, R, Horseman, L, Lam, LI, Meerdink, M, Menham, D, Murphy, R, Nimmo, I, Ramaesh, A, Rees, J, Soame, R, Dilaver, N, Adebambo, D, Brown, E, Burt, J, Foster, K, Kaliyappan, L, Knight, P, Politis, A, Richardson, E, Townsend, J, Abdi, M, Ball, M, Easby, S, Gill, N, Ho, E, Iqbal, H, Matthews, M, Nubi, S, Nwokocha, JO, Okafor, I, Perry, G, Sinartio, B, Vanukuru, N, Walkley, D, Welch, T, Yates, J, Yeshitila, N, Bryans, K, Campbell, B, Gray, C, Keys, R, Macartney, M, Chamberlain, G, Khatri, A, Kucheria, A, Lee, STP, Reese, G, Roy choudhury, J, Tan, WYR, Teh, JJ, Ting, A, Kazi, S, Kontovounisios, C, Vutipongsatorn, K, Amarnath, T, Balasubramanian, N, Bassett, E, Gurung, P, Lim, J, Panjikkaran, A, Sanalla, A, Alkoot, M, Bacigalupo, V, Eardley, N, Horton, M, Hurry, A, Isti, C, Maskell, P, Nursiah, K, Punn, G, Salih, H, Epanomeritakis, E, Foulkes, A, Henderson, R, Johnston, E, McCullough, H, McLarnon, M, Morrison, E, Cheung, A, Cho, SH, Eriksson, F, Hedges, J, Low, Z, May, C, Musto, L, Nagi, S, Nur, S, Salau, E, Shabbir, S, Thomas, MC, Uthayanan, L, Vig, S, Zaheer, M, Zeng, G, Ashcroft-Quinn, S, Brown, R, Hayes, J, McConville, R, French, R, Gilliam, A, Sheetal, S, Shehzad, MU, Bani, W, Christie, I, Franklyn, J, Khan, M, Russell, J, Smolarek, S, Varadarassou, R, Ahmed, SK, Narayanaswamy, S, Sealy, J, Shah, M, Dodhia, V, Manukyan, A, O'Hare, R, Orbell, J, Chung, I, Forenc, K, Gupta, A, Agarwal, A, Al Dabbagh, A, Bennewith, R, Bottomley, J, Chu, TSM, Chu, YYA, Doherty, W, Evans, B, Hainsworth, P, Hosfield, T, Li, CH, McCullagh, I, Mehta, A, Thaker, A, Thompson, B, Virdi, A, Walker, H, Wilkins, E, Dixon, C, Hassan, MR, Lotca, N, Tong, KS, Batchelor-Parry, H, Chaudhari, S, Harris, T, Hooper, J, Johnson, C, Mulvihill, C, Nayler, J, Olutobi, O, Piramanayagam, B, Stones, K, Sussman, M, Weaver, C, Alam, F, Al Rawi, M, Andrew, F, Arrayeh, A, Azizan, N, Hassan, A, Iqbal, Z, John, I, Jones, M, Kalake, O, Keast, M, Nicholas, J, Patil, A, Powell, K, Roberts, P, Sabri, A, Segue, AK, Shah, A, Shaik Mohamed, SA, Shehadeh, A, Shenoy, S, Tong, A, Upcott, M, Vijayasingam, D, Anarfi, S, Dauncey, J, Devindaran, A, Havalda, P, Komninos, G, Mwendwa, E, Norman, C, Richards, J, Urquhart, A, Allan, J, Cahya, E, Hunt, H, McWhirter, C, Norton, R, Roxburgh, C, Tan, JY, Ali Butt, S, Hansdot, S, Haq, I, Mootien, A, Sanchez, I, Vainas, T, Deliyannis, E, Tan, M, Vipond, M, Chittoor Satish, NN, Dattani, A, De Carvalho, L, Gaston-Grubb, M, Karunanithy, L, Lowe, B, Pace, C, Raju, K, Roope, J, Taylor, C, Youssef, H, Munro, T, Thorn, C, Wong, KHF, Yunus, A, Chawla, S, Datta, A, Dinesh, AA, Field, D, Georgi, T, Gwozdz, A, Hamstead, E, Howard, N, Isleyen, N, Jackson, N, Kingdon, J, Sagoo, KS, Schizas, A, Yin, L, Aung, E, Aung, YY, Franklin, S, Han, SM, Kim, WC, Martin Segura, A, Rossi, M, Ross, T, Tirimanna, R, Wang, B, Zakieh, O, Ben-Arzi, H, Flach, A, Jackson, E, Magers, S, Olu abara, C, Rogers, E, Sugden, K, Tan, H, Veliah, S, Walton, U, Asif, A, Bharwada, Y, Bowley, D, Broekhuizen, A, Cooper, L, Evans, N, Girdlestone, H, Ling, C, Mann, H, Mehmood, N, Mulvenna, CL, Rainer, N, Trout, I, Gujjuri, R, Jeyaraman, D, Leong, E, Singh, D, Smith, E, Anderton, J, Barabas, M, Goyal, S, Howard, D, Joshi, A, Mitchell, D, Weatherby, T, Badminton, R, Bird, R, Burtle, D, Choi, NY, Devalia, K, Farr, E, Fischer, F, Fish, J, Gunn, F, Jacobs, D, Johnston, P, Kalakoutas, A, Lau, E, Loo, YNAF, 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Taylor, E, Trafford, C, Uden, C, Waddington, C, Yassin, D, Zaman, M, Bangi, S, Cheng, T, Chew, D, Hussain, N, Imani-Masouleh, S, Mahasivam, G, McKnight, G, Ng, HL, Ota, HC, Pasha, T, Ravindran, W, Shah, K, Vishnu K, S, Zaman, S, Carr, W, Cope, S, Eagles, EJ, Howarth-Maddison, M, Li, CY, Reed, J, Ridge, A, Stubbs, T, Teasdaled, D, Umar, R, Worthington, J, Dhebri, A, Kalenderov, R, Alattas, A, Arain, Z, Bhudia, R, Chia, D, Daniel, S, Dar, T, Garland, H, Girish, M, Hampson, A, Kyriacou, H, Lehovsky, K, Mullins, W, Omorphos, N, Vasdev, N, Venkatesh, A, Waldock, W, Bhandari, A, Brown, G, Choa, G, Eichenauer, CE, Ezennia, K, Kidwai, Z, Lloyd-Thomas, A, Macaskill Stewart, A, Massardi, C, Sinclair, E, Skajaa, N, Smith, M, Tan, I, Afsheen, N, Anuar, A, Azam, Z, Bhatia, P, Davies-kelly, N, Dickinson, S, Elkawafi, M, Ganapathy, M, Gupta, S, Khoury, EG, Licudi, D, Mehta, V, Neequaye, S, Nita, G, Tay, VL, Zhao, S, Botsa, E, Cuthbert, H, Elliott, J, Furlepa, M, Lehmann, J, Mangtani, A, Narayan, A, Nazarian, S, Parmar, C, Shah, D, Shaw, C, Zhao, Z, Beck, C, Caldwell, S, Clements, JM, French, B, Kenny, R, Kirk, S, Lindsay, J, McClung, A, McLaughlin, N, Watson, S, Whiteside, E, Alyacoubi, S, Arumugam, V, Beg, R, Dawas, K, Garg, S, Lloyd, ER, Mahfouz, Y, Manobharath, N, Moonesinghe, R, Morka, N, Patel, K, Prashar, J, Yip, S, Adeeko, ES, Ajekigbe, F, Bhat, A, Evans, C, Farrugia, A, Gurung, C, Long, T, Malik, B, Manirajan, S, Newport, D, Rayer, J, Ridha, A, Ross, E, Saran, T, Sinker, A, Waruingi, D, Allen, R, Al Sadek, Y, Alves do Canto Brum, H, Asharaf, H, Ashman, M, Balakumar, V, Barrington, J, Baskaran, R, Berry, A, Bhachoo, H, Bilal, A, Boaden, L, Chia, WL, Covell, G, Crook, D, Dadnam, F, Davis, L, De Berker, H, Doyle, C, Fox, C, Gruffydd-Davies, M, Hafouda, Y, Hill, A, Hubbard, E, Hunter, A, Inpadhas, V, Jamshaid, M, Jandu, G, Jeyanthi, M, Jones, T, Kantor, C, Kwak, SY, Malik, N, Matt, R, McNulty, P, Miles, C, Mohomed, A, Myat, P, Niharika, J, Nixon, A, O'Reilly, D, Parmar, K, Pengelly, S, Price, L, Ramsden, M, Turnor, R, Wales, E, Waring, H, Wu, M, Yang, T, Ye, TTS, Zander, A, Zeicu, C, Bellam, S, Francombe, J, Kawamoto, N, Rahman, MR, Sathyanarayana, A, Tang, HT, Cheung, J, Hollingshead, J, Page, V, Sugarman, J, Wong, E, Chiong, J, Fung, E, Kan, SY, Kiang, J, Kok, J, Krahelski, O, Liew, MY, Lyell, B, Sharif, Z, Speake, D, Alim, L, Amakye, NY, Chandrasekaran, J, Chandratreya, N, Drake, J, Owoso, T, Thu, YM, Abou El Ela Bourquin, B, Alberts, J, Chapman, D, Rehnnuma, N, Ainsworth, K, Carpenter, H, Emmanuel, T, Fisher, T, Gabrel, M, Guan, Z, Hollows, S, Hotouras, A, Ip Fung Chun, N, Jaffer, S, Kallikas, G, Kennedy, N, Lewinsohn, B, Liu, FY, Mohammed, S, Rutherfurd, A, Situ, T, Stammer, A, Taylor, F, Thin, N, Urgesi, E, Zhang, N, Ahmad, MA, Bishop, A, Bowes, A, Dixit, A, Glasson, R, Hatta, S, Hatt, K, Larcombe, S, Preece, J, Riordan, E, Fegredo, D, Haq, MZ, Li, C, McCann, G, Stewart, D, Baraza, W, Bhullar, D, Burt, G, Coyle, J, Deans, J, Devine, A, Hird, R, Ikotun, O, Manchip, G, Ross, C, Storey, L, Tan, WWL, Tse, C, Warner, C, Whitehead, M, Wu, F, Court, EL, Crisp, E, Huttman, M, Mayes, F, Robertson, H, Rosen, H, Sandberg, C, Smith, H, Al Bakry, M, Ashwell, W, Bajaj, S, Bandyopadhyay, D, Browlee, O, Burway, S, Chand, CP, Elsayeh, K, Elsharkawi, A, Evans, E, Ferrin, S, Fort-Schaale, A, Iacob, M, I, K, Impelliziere Licastro, G, Mankoo, AS, Olaniyan, T, Otun, J, Pereira, R, Reddy, R, Saeed, D, Simmonds, O, Singhal, G, Tron, K, Wickstone, C, Williams, R, Bradshaw, E, De Kock Jewell, V, Houlden, C, Knight, C, Metezai, H, Mirza-Davies, A, Seymour, Z, Spink, D, and Wischhusen, S

Published
2022
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33. Antiferromagnetism with divalent Eu in EuNi$_5$As$_3$

Author

Jiang, W. B., Smidman, M., Xie, W., Liu, J. Y., Lee, J. M., Chen, J. M., Ho, S. C., Ishii, H., Tsuei, K. D., Guo, C. Y., Zhang, Y. J., Lee, Hanoh, and Yuan, H. Q.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

We have successfully synthesized single crystals of EuNi$_5$As$_3$ using a flux method and we present a comprehensive study of the physical properties using magnetic susceptibility, specific heat, electrical resistivity, thermoelectric power and x-ray absorption spectroscopy (XAS) measurements. EuNi$_5$As$_3$ undergoes two close antiferromagnetic transitions at respective temperatures of $T_{N1}$ = 7.2 K and $T_{N2}$ = 6.4 K, which are associated with the Eu$^{2+}$ moments. Both transitions are suppressed upon applying a field and we map the temperature-field phase diagrams for fields applied parallel and perpendicular to the easy $a$ axis. XAS measurements reveal that the Eu is strongly divalent, with very little temperature dependence, indicating the localized Eu$^{2+}$ nature of EuNi$_5$As$_3$, with a lack of evidence for heavy fermion behavior., Comment: 9 pages, 11 figures

Published
2017
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34. Strategies to address inequity of uncorrected refractive error in the Western Pacific: A modified Delphi process.

Author

McCormick, Ian, Tong, Kelvin, Abdullah, Nurliyana, Abesamis‐Dischoso, Carmen, Gende, Theresa, Hashim, Effendy Bin, Ho, S. May, Jalbert, Isabelle, Jeronimo, Belmerio, Matoto‐Raikabakaba, Elenoa, Ono, Koichi, Piyasena, Prabhath Nishantha, Rogers, Jaymie T., Szetu, John, Tran, Minh Anh, Tse, Dennis Yan‐yin, Win, Ye, Yap, Tiong Peng, Yoon, Sangchul, and Yusufu, Mayinuer

Subjects
VISION disorders, REFRACTIVE errors, EYE care, HEALTH programs, RESEARCH personnel
Abstract

Purpose: Uncorrected refractive error is the leading cause of vision impairment globally; however, little attention has been given to equity and access to services. This study aimed to identify and prioritise: (1) strategies to address inequity of access to refractive error services and (2) population groups to target with these strategies in five sub‐regions within the Western Pacific. Methods: We invited eye care professionals to complete a two‐round online prioritisation process. In round 1, panellists nominated population groups least able to access refractive error services, and strategies to improve access. Responses were summarised and presented in round 2, where panellists ranked the groups (by extent of difficulty and size) and strategies (in terms of reach, acceptability, sustainability, feasibility and equity). Groups and strategies were scored according to their rank within each sub‐region. Results: Seventy five people from 17 countries completed both rounds (55% women). Regional differences were evident. Indigenous peoples were a priority group for improving access in Australasia and Southeast Asia, while East Asia identified refugees and Oceania identified rural/remote people. Across the five sub‐regions, reducing out‐of‐pocket costs was a commonly prioritised strategy for refraction and spectacles. Australasia prioritised improving cultural safety, East Asia prioritised strengthening school eye health programmes and Oceania and Southeast Asia prioritised outreach to rural areas. Conclusion: These results provide policy‐makers, researchers and funders with a starting point for context‐specific actions to improve access to refractive error services, particularly among underserved population groups who may be left behind in existing private sector‐dominated models of care. [ABSTRACT FROM AUTHOR]

Published
2024
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36. The detection of the imprint of filaments on cosmic microwave background lensing

Author

He, S, Alam, S, Ferraro, S, Chen, YC, and Ho, S

Subjects
astro-ph.CO
Abstract

Galaxy redshift surveys, such as the 2-Degree-Field Survey (2dF) 1, Sloan Digital Sky Survey (SDSS) 2, 6-Degree-Field Survey (6dF) 3, Galaxy And Mass Assembly survey (GAMA) 4 and VIMOS Public Extragalactic Redshift Survey (VIPERS) 5, have shown that the spatial distribution of matter forms a rich web, known as the cosmic web 6 . Most galaxy survey analyses measure the amplitude of galaxy clustering as a function of scale, ignoring information beyond a small number of summary statistics. Because the matter density field becomes highly non-Gaussian as structure evolves under gravity, we expect other statistical descriptions of the field to provide us with additional information. One way to study the non-Gaussianity is to study filaments, which evolve non-linearly from the initial density fluctuations produced in the primordial Universe. In our study, we report the detection of lensing of the cosmic microwave background (CMB) by filaments, and we apply a null test to confirm our detection. Furthermore, we propose a phenomenological model to interpret the detected signal, and we measure how filaments trace the matter distribution on large scales through filament bias, which we measure to be around 1.5. Our study provides new scope to understand the environmental dependence of galaxy formation. In the future, the joint analysis of lensing and Sunyaev-Zel'dovich observations might reveal the properties of 'missing baryons', the vast majority of the gas that resides in the intergalactic medium, which has so far evaded most observations.

Published
2018

37. A Force on the Crown and Tug of War in the Periodontal Complex.

Author

Jang, A, Chen, L, Shimotake, A, Altoe, V, Ho, S, Ryder, Mark, Aloni, Shaul, and Landis, William

Subjects
X-ray computed tomography, dentoalveolar, entheses, interface, mechanobiology, periodontal ligament, Adaptation, Physiological, Animals, Biomechanical Phenomena, Bone and Bones, Dental Cementum, Dental Stress Analysis, Humans, Mastication, Mouth Diseases, Periodontal Ligament, Tooth Crown
Abstract

The load-bearing dentoalveolar fibrous joint is composed of biomechanically active periodontal ligament (PDL), bone, cementum, and the synergistic entheses of PDL-bone and PDL-cementum. Physiologic and pathologic loads on the dentoalveolar fibrous joint prompt natural shifts in strain gradients within mineralized and fibrous tissues and trigger a cascade of biochemical events within the widened and narrowed sites of the periodontal complex. This review highlights data from in situ biomechanical simulations that provide tooth movements relative to the alveolar socket. The methods and subsequent results provide a reasonable approximation of strain-regulated biochemical events resulting in mesial mineral formation and distal resorption events within microanatomical regions at the ligament-tethered/enthesial ends. These biochemical events, including expressions of biglycan, decorin, chondroitin sulfated neuroglial 2, osteopontin, and bone sialoprotein and localization of various hypertrophic progenitors, are observed at the alkaline phosphatase-positive widened site, resulting in mineral formation and osteoid/cementoid layers. On the narrowed side, tartrate-resistant acid phosphatase regions can lead to a sequence of clastic activities resulting in resorption pits in bone and cementum. These strain-regulated biochemical and subsequently biomineralization events in the load-bearing periodontal complex are critical for maintenance of the periodontal space and overall macroscale joint biomechanics.

Published
2018

38. The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample: First measurement of baryon acoustic oscillations between redshift 0.8 and 2.2

Author

Ata, M, Baumgarten, F, Bautista, J, Beutler, F, Bizyaev, D, Blanton, MR, Blazek, JA, Bolton, AS, Brinkmann, J, Brownstein, JR, Burtin, E, Chuang, CH, Comparat, J, Dawson, KS, de la Macorra, A, Du, W, des Bourboux, HDM, Eisenstein, DJ, Gil-Marín, H, Grabowski, K, Guy, J, Hand, N, Ho, S, Hutchinson, TA, Ivanov, MM, Kitaura, FS, Kneib, JP, Laurent, P, Le Goff, JM, McEwen, JE, Mueller, EM, Myers, AD, Newman, JA, Palanque-Delabrouille, N, Pan, K, Pâris, I, Pellejero-Ibanez, M, Percival, WJ, Petitjean, P, Prada, F, Prakash, A, Rodríguez-Torres, SA, Ross, AJ, Rossi, G, Ruggeri, R, Sánchez, AG, Satpathy, S, Schlegel, DJ, Schneider, DP, Seo, HJ, Slosar, A, Streblyanska, A, Tinker, JL, Tojeiro, R, Magaña, MV, Vivek, M, Wang, Y, Yèche, C, Yu, L, Zarrouk, P, Zhao, C, Zhao, GB, and Zhu, F

Subjects
cosmology: observations, dark energy, distance scale, large-scale structure of Universe, astro-ph.CO, Astronomy & Astrophysics, Astronomical and Space Sciences
Abstract

We present measurements of the Baryon Acoustic Oscillation (BAO) scale in redshift-space using the clustering of quasars. We consider a sample of 147 000 quasars from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) distributed over 2044 square degrees with redshifts 0.8 < z < 2.2 and measure their spherically averaged clustering in both configuration and Fourier space. Our observational data set and the 1400 simulated realizations of the data set allow us to detect a preference for BAO that is greater than 2.8σ. We determine the spherically averaged BAO distance to z = 1.52 to 3.8 per cent precision: DV (z = 1.52) = 3843 ± 147 (rd/rd,fid) Mpc. This is the first time the location of the BAO feature has been measured between redshifts 1 and 2. Our result is fully consistent with the prediction obtained by extrapolating the Planck flatΛCDMbest-fitting cosmology. All of our results are consistent with basic large-scale structure (LSS) theory, confirming quasars to be a reliable tracer of LSS, and provide a starting point for numerous cosmological tests to be performed with eBOSS quasar samples. We combine our result with previous, independent, BAO distance measurements to construct an updated BAO distance-ladder. Using these BAO data alone and marginalizing over the length of the standard ruler, we find ΩΛ > 0 at 6.6s significance when testing a ΛCDM model with free curvature.

Published
2018

42. 18.3 An 8b 160GS/s 57GHz Bandwidth Time-Interleaved DAC and Driver-Based Transmitter with Adaptive Calibration for 800Gb/s Coherent Optical Applications in 5nm

Author

Ahmad, F., primary, Mellati, A., additional, Fernandez, A., additional, Iyer, A., additional, Fan, A., additional, Reyes, B., additional, Abidin, C., additional, Nani, C., additional, Albano, D., additional, Solis, F., additional, Minoia, G., additional, Hatcher, G., additional, Carrer, H., additional, Kota, K., additional, Wang, L., additional, Bachu, M., additional, Garampazzi, M., additional, Hassanpourghadi, M., additional, Fan, N., additional, Prabha, P., additional, Nguyen, R., additional, Ho, S., additional, Dusatko, T., additional, Wu, T., additional, Elsharkasy, W., additional, Sun, Z., additional, Jantzi, S., additional, and Tse, L., additional

Published
2024
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43. 18.4 A 200GS/s 8b 20fJ/c-s Receiver with >60GHz AFE Bandwidth for 800Gb/s Optical Coherent Communications in 5nm FinFET

Author

Nguyen, R. L., primary, Mellati, A., additional, Fernandez, A., additional, Iyer, A., additional, Fan, A., additional, Reyes, B., additional, Abidin, C., additional, Nani, C., additional, Albano, D., additional, Ahmad, F., additional, Solis, F., additional, Minoia, G., additional, Hatcher, G., additional, Bachu, M., additional, Garampazzi, M., additional, Hassanpourghadi, M., additional, Fan, N., additional, Prabha, P., additional, Fan, S., additional, Ho, S., additional, Dusatko, T., additional, Wu, T., additional, Elsharkasy, W., additional, Sun, Z., additional, Jantzi, S., additional, and Tse, L., additional

Published
2024
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46. The Atacama Cosmology Telescope: Two-Season ACTPol Spectra and Parameters

Author

Louis, Thibaut, Grace, Emily, Hasselfield, Matthew, Lungu, Marius, Maurin, Loïc, Addison, Graeme E., Ade, Peter A. R., Aiola, Simone, Allison, Rupert, Amiri, Mandana, Angile, Elio, Battaglia, Nicholas, Beall, James A., de Bernardis, Francesco, Bond, J. Richard, Britton, Joe, Calabrese, Erminia, Cho, Hsiao-mei, Choi, Steve K., Coughlin, Kevin, Crichton, Devin, Crowley, Kevin, Datta, Rahul, Devlin, Mark J., Dicker, Simon R., Dunkley, Joanna, Dünner, Rolando, Ferraro, Simone, Fox, Anna E., Gallardo, Patricio, Gralla, Megan, Halpern, Mark, Henderson, Shawn, Hill, J. Colin, Hilton, Gene C., Hilton, Matt, Hincks, Adam D., Hlozek, Renée, Ho, S. P. Patty, Huang, Zhiqi, Hubmayr, Johannes, Huffenberger, Kevin M., Hughes, John P., Infante, Leopoldo, Irwin, Kent, Kasanda, Simon Muya, Klein, Jeff, Koopman, Brian, Kosowsky, Arthur, Li, Dale, Madhavacheril, Mathew, Marriage, Tobias A., McMahon, Jeff, Menanteau, Felipe, Moodley, Kavilan, Munson, Charles, Naess, Sigurd, Nati, Federico, Newburgh, Laura, Nibarger, John, Niemack, Michael D., Nolta, Michael R., Nuñez, Carolina, Page, Lyman A., Pappas, Christine, Partridge, Bruce, Rojas, Felipe, Schaan, Emmanuel, Schmitt, Benjamin L., Sehgal, Neelima, Sherwin, Blake D., Sievers, Jon, Simon, Sara, Spergel, David N., Staggs, Suzanne T., Switzer, Eric R., Thornton, Robert, Trac, Hy, Treu, Jesse, Tucker, Carole, Van Engelen, Alexander, Ward, Jonathan T., and Wollack, Edward J.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present the temperature and polarization angular power spectra measured by the Atacama Cosmology Telescope Polarimeter (ACTPol). We analyze night-time data collected during 2013-14 using two detector arrays at 149 GHz, from 548 deg$^2$ of sky on the celestial equator. We use these spectra, and the spectra measured with the MBAC camera on ACT from 2008-10, in combination with Planck and WMAP data to estimate cosmological parameters from the temperature, polarization, and temperature-polarization cross-correlations. We find the new ACTPol data to be consistent with the LCDM model. The ACTPol temperature-polarization cross-spectrum now provides stronger constraints on multiple parameters than the ACTPol temperature spectrum, including the baryon density, the acoustic peak angular scale, and the derived Hubble constant. Adding the new data to planck temperature data tightens the limits on damping tail parameters, for example reducing the joint uncertainty on the number of neutrino species and the primordial helium fraction by 20%., Comment: 23 pages, 25 figures

Published
2016
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47. Survey strategy optimization for the Atacama Cosmology Telescope

Author

De Bernardis, F., Stevens, J. R., Hasselfield, M., Alonso, D., Bond, J. R., Calabrese, E., Choi, S. K., Crowley, K. T., Devlin, M., Dunkley, J., Gallardo, P. A., Henderson, S. W., Hilton, M., Hlozek, R., Ho, S. P., Huffenberger, K., Koopman, B. J., Kosowsky, A., Louis, T., Madhavacheril, M. S., McMahon, J., Naess, S., Nati, F., Newburgh, L., Niemack, M. D., Page, L. A., Salatino, M., Schillaci, A., Schmitt, B. L., Sehgal, N., Sievers, J. L., Simon, S. M., Spergel, D. N., Staggs, S. T., van Engelen, A., Vavagiakis, E. M., and Wollack, E. J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

In recent years there have been significant improvements in the sensitivity and the angular resolution of the instruments dedicated to the observation of the Cosmic Microwave Background (CMB). ACTPol is the first polarization receiver for the Atacama Cosmology Telescope (ACT) and is observing the CMB sky with arcmin resolution over about 2000 sq. deg. Its upgrade, Advanced ACTPol (AdvACT), will observe the CMB in five frequency bands and over a larger area of the sky. We describe the optimization and implementation of the ACTPol and AdvACT surveys. The selection of the observed fields is driven mainly by the science goals, that is, small angular scale CMB measurements, B-mode measurements and cross-correlation studies. For the ACTPol survey we have observed patches of the southern galactic sky with low galactic foreground emissions which were also chosen to maximize the overlap with several galaxy surveys to allow unique cross-correlation studies. A wider field in the northern galactic cap ensured significant additional overlap with the BOSS spectroscopic survey. The exact shapes and footprints of the fields were optimized to achieve uniform coverage and to obtain cross-linked maps by observing the fields with different scan directions. We have maximized the efficiency of the survey by implementing a close to 24 hour observing strategy, switching between daytime and nighttime observing plans and minimizing the telescope idle time. We describe the challenges represented by the survey optimization for the significantly wider area observed by AdvACT, which will observe roughly half of the low-foreground sky. The survey strategies described here may prove useful for planning future ground-based CMB surveys, such as the Simons Observatory and CMB Stage IV surveys., Comment: 14 Pages, 9 Figures, 4 Tables

Published
2016
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48. The Atacama Cosmology Telescope: The polarization-sensitive ACTPol instrument

Author

Thornton, R. J., Ade, P. A. R., Aiola, S., Angile, F. E., Amiri, M., Beall, J. A., Becker, D. T., Cho, H-M., Choi, S. K., Corlies, P., Coughlin, K. P., Datta, R., Devlin, M. J., Dicker, S. R., Dunner, R., Fowler, J. W., Fox, A. E., Gallardo, P. A., Gao, J., Grace, E., Halpern, M., Hasselfield, M., Henderson, S. W., Hilton, G. C., Hincks, A. D., Ho, S. P., Hubmayr, J., Irwin, K. D., Klein, J., Koopman, B., Li, Dale, Louis, T., Lungu, M., Maurin, L., McMahon, J., Munson, C. D., Naess, S., Nati, F., Newburgh, L., Nibarger, J., Niemack, M. D., Niraula, P., Nolta, M. R., Page, L. A., Pappas, C. G., Schillaci, A., Schmitt, B. L., Sehgal, N., Sievers, J. L., Simon, S. M., Staggs, S. T., Tucker, C., Uehara, M., van Lanen, J., Ward, J. T., and Wollack, E. J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Atacama Cosmology Telescope (ACT) is designed to make high angular resolution measurements of anisotropies in the Cosmic Microwave Background (CMB) at millimeter wavelengths. We describe ACTPol, an upgraded receiver for ACT, which uses feedhorn-coupled, polarization-sensitive detector arrays, a 3 degree field of view, 100 mK cryogenics with continuous cooling, and meta material anti-reflection coatings. ACTPol comprises three arrays with separate cryogenic optics: two arrays at a central frequency of 148 GHz and one array operating simultaneously at both 97 GHz and 148 GHz. The combined instrument sensitivity, angular resolution, and sky coverage are optimized for measuring angular power spectra, clusters via the thermal Sunyaev-Zel'dovich and kinetic Sunyaev-Zel'dovich signals, and CMB lensing due to large scale structure. The receiver was commissioned with its first 148 GHz array in 2013, observed with both 148 GHz arrays in 2014, and has recently completed its first full season of operations with the full suite of three arrays. This paper provides an overview of the design and initial performance of the receiver and related systems.

Published
2016
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49. Systematic effects from an ambient-temperature, continuously-rotating half-wave plate

Author

Essinger-Hileman, T., Kusaka, A., Appel, J. W., Choi, S. K., Crowley, K., Ho, S. P., Jarosik, N., Page, L. A., Parker, L. P., Raghunathan, S., Simon, S. M., Staggs, S. T., and Visnjic, K.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present an evaluation of systematic effects associated with a continuously-rotating, ambient-temperature half-wave plate (HWP) based on two seasons of data from the Atacama B-Mode Search (ABS) experiment located in the Atacama Desert of Chile. The ABS experiment is a microwave telescope sensitive at 145 GHz. Here we present our in-field evaluation of celestial (CMB plus galactic foreground) temperature-to-polarization leakage. We decompose the leakage into scalar, dipole, and quadrupole leakage terms. We report a scalar leakage of ~0.01%, consistent with model expectations and an order of magnitude smaller than other CMB experiments have reported. No significant dipole or quadrupole terms are detected; we constrain each to be <0.07% (95% confidence), limited by statistical uncertainty in our measurement. Dipole and quadrupole leakage at this level lead to systematic error on r<0.01 before any mitigation due to scan cross-linking or boresight rotation. The measured scalar leakage and the theoretical level of dipole and quadrupole leakage produce systematic error of r<0.001 for the ABS survey and focal-plane layout before any data correction such as so-called deprojection. This demonstrates that ABS achieves significant beam systematic error mitigation from its HWP and shows the promise of continuously-rotating HWPs for future experiments., Comment: 11 pages, 8 figures; revision to submitted version, Fig. 5 and Eqs. (14) and (15) corrected; added Fig. 9 and description, text revisions for clarification, Fig. 5 revised for better calibration, corrected labeling errors and plotting bugs in Fig. 3, 4, and Eq. (14) and (15)

Published
2016
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50. Characterizing Atacama B-mode Search Detectors with a Half-Wave Plate

Author

Simon, S. M., Appel, J. W., Campusano, L. E., Choi, S. K., Crowley, K. T., Essinger-Hileman, T., Gallardo, P., Ho, S. P., Kusaka, A., Nati, F., Palma, G. A., Page, L. A., Raghunathan, S., and Staggs, S. T.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The Atacama B-Mode Search (ABS) instrument is a cryogenic ($\sim$10 K) crossed-Dragone telescope located at an elevation of 5190 m in the Atacama Desert in Chile that observed for three seasons between February 2012 and October 2014. ABS observed the Cosmic Microwave Background (CMB) at large angular scales ($40<\ell<500$) to limit the B-mode polarization spectrum around the primordial B-mode peak from inflationary gravity waves at $\ell \sim100$. The ABS focal plane consists of 480 transition-edge sensor (TES) bolometers. They are coupled to orthogonal polarizations from a planar ortho-mode transducer (OMT) and observe at 145 GHz. ABS employs an ambient-temperature, rapidly rotating half-wave plate (HWP) to mitigate systematic effects and move the signal band away from atmospheric $1/f$ noise, allowing for the recovery of large angular scales. We discuss how the signal at the second harmonic of the HWP rotation frequency can be used for data selection and for monitoring the detector responsivities., Comment: 7 pages, 3 figures, conference proceedings submitted to the Journal of Low Temperature Detectors

Published
2015
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