Showing papers by "Steve Kuhlmann published in 2021"
University of California, Berkeley1, Case Western Reserve University2, University of Illinois at Urbana–Champaign3, Fermilab4, University of Chicago5, Michigan State University6, University of California, Los Angeles7, Cardiff University8, SLAC National Accelerator Laboratory9, Stanford University10, University of California, Davis11, University of Melbourne12, Argonne National Laboratory13, California Institute of Technology14, Institut d'Astrophysique de Paris15, McGill University16, KEK17, National Institute of Standards and Technology18, Canadian Institute for Advanced Research19, University of Colorado Boulder20, University of Pennsylvania21, Lawrence Berkeley National Laboratory22, University of Arizona23, Harvard University24, National Center for Supercomputing Applications25, University of Toronto26, University of California, Santa Barbara27
TL;DR: The first results of an astronomical transient survey with the South Pole Telescope (SPT) using the SPT-3G camera to observe 1500 deg2 of the southern sky were reported in this article.
Abstract: High angular resolution cosmic microwave background experiments provide a unique opportunity to conduct a survey of time-variable sources at millimeter wavelengths, a population that has primarily been understood through follow-up measurements of detections in other bands. Here we report the first results of an astronomical transient survey with the South Pole Telescope (SPT) using the SPT-3G camera to observe 1500 deg2 of the southern sky. The observations took place from 2020 March to November in three bands centered at 95, 150, and 220 GHz. This survey yielded the detection of 15 transient events from sources not previously detected by the SPT. The majority are associated with variable stars of different types, expanding the number of such detected flares by more than a factor of two. The stellar flares are unpolarized and bright, in some cases exceeding 1 Jy, and have durations from a few minutes to several hours. Another population of detected events last for 2-3 weeks and appear to be extragalactic in origin. Though data availability at other wavelengths is limited, we find evidence for concurrent optical activity for two of the stellar flares. Future data from SPT-3G and forthcoming instruments will provide real-time detection of millimeter-wave transients on timescales of minutes to months.
16 citations
TL;DR: In this article, the authors report on the ongoing development of OMT-coupled CMB detectors at Argonne National Laboratory, including bolometers with dual Transition Edge Sensors (TES) for easier lab characterization, a hybrid SiN membrane fabrication process, a chemical vapor deposition (CVD) SiN dielectric process, and a new pixel design for improved compatibility with large scale fabrication.
Abstract: Future cosmic microwave background (CMB) experiments will deploy increasing numbers of superconducting detectors with requirements for increased sensitivity and reduced systematics. We report on the ongoing development of OMT-coupled CMB detectors at Argonne National Laboratory. Key areas of development include bolometers with dual Transition Edge Sensors (TES) for easier lab characterization, a hybrid SiN membrane fabrication process, a chemical vapor deposition (CVD) SiN dielectric process, and a new pixel design for improved compatibility with large scale fabrication. These developments enhance our ability to fabricate large-scale (150 mm diameter wafers) detector arrays with the performance necessary for future CMB experiments.
6 citations
University of California, Berkeley1, Case Western Reserve University2, University of Illinois at Urbana–Champaign3, University of Chicago4, Fermilab5, University of California, Los Angeles6, Michigan State University7, Cardiff University8, SLAC National Accelerator Laboratory9, Stanford University10, University of California, Davis11, University of Melbourne12, Argonne National Laboratory13, California Institute of Technology14, Institut d'Astrophysique de Paris15, McGill University16, KEK17, National Institute of Standards and Technology18, Canadian Institute for Advanced Research19, University of Colorado Boulder20, University of Pennsylvania21, Lawrence Berkeley National Laboratory22, University of Arizona23, Harvard University24, National Center for Supercomputing Applications25, University of Toronto26, University of California, Santa Barbara27
TL;DR: The first results of an astronomical transient survey with the South Pole Telescope (SPT) using the SPT-3G camera to observe 1500 square degrees of the southern sky were reported in this paper.
Abstract: High-angular-resolution cosmic microwave background experiments provide a unique opportunity to conduct a survey of time-variable sources at millimeter wavelengths, a population which has primarily been understood through follow-up measurements of detections in other bands. Here we report the first results of an astronomical transient survey with the South Pole Telescope (SPT) using the SPT-3G camera to observe 1500 square degrees of the southern sky. The observations took place from March to November 2020 in three bands centered at 95, 150, and 220 GHz. This survey yielded the detection of fifteen transient events from sources not previously detected by the SPT. The majority are associated with variable stars of different types, expanding the number of such detected flares by more than a factor of two. The stellar flares are unpolarized and bright, in some cases exceeding 1 Jy, and have durations from a few minutes to several hours. Another population of detected events last for 2--3 weeks and appear to be extragalactic in origin. Though data availability at other wavelengths is limited, we find evidence for concurrent optical activity for two of the stellar flares. Future data from SPT-3G and forthcoming instruments will provide real-time detection of millimeter-wave transients on timescales of minutes to months.
5 citations