Tobias Marriage’s research interests lie in cosmology and astrophysics with an emphasis on the cosmic microwave background (CMB). His research activities include millimeter-wave instrumentation, fieldwork, and analysis. Marriage played a major part in building the Atacama Cosmology Telescope (ACT), a mm-wave telescope 5,000 meters above sea level in Chile that studies fine angular-scale structure in the CMB. He and his group continue to work with ACT data and other datasets to study galaxies and galaxy clusters. Marriage is now a Co-PI of the Cosmology Large Angular Scale Surveyor (CLASS) project. CLASS is an array of telescopes designed to measure the CMB polarization on the largest angular scales over a broad range of frequencies. The primary goal of CLASS is to detect and characterize the expected gravitational waves from inflation via the induced B-mode polarization pattern in the CMB. CLASS also measures when the first stars formed (by constraining the optical depth to reionization) and searches for large angular scale polarization anomalies that could provide new insights beyond the current cosmological paradigm.

Selected Publications:

• High-Efficiency and Low-Noise Detectors for the Upgraded CLASS 90 GHz Focal Plane
• Sensitivity-Improved Polarization Maps at 40 GHz with CLASS and WMAP data
• CLASS Observations of Atmospheric Cloud Polarization at Millimeter Wavelengths
• CLASS Angular Power Spectra and Map-Component Analysis for 40 GHz Observations through 2022
• Cosmology Large Angular Scale Surveyor (CLASS): 90 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
• CLASS Data Pipeline and Maps for 40 GHz Observations through 2022
• Microwave Observations of Venus with CLASS
• Testing CMB Anomalies in E-mode Polarization with Current and Future Data
• Four-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: On-sky Receiver Performance at 40, 90, 150, and 220 GHz Frequency Bands
• Constraining CMB temperature evolution with Sunyaev-Zel'dovich galaxy clusters from the Atacama Cosmology Telescope
• Venus Observations at 40 and 90 GHz with CLASS
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: Long Timescale Stability Achieved with a Front-End Variable-delay Polarization Modulator at 40 GHz
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q Band
• Quantifying the Thermal Sunyaev-Zel'dovich Effect and Excess Millimeter Emission in Quasar Environments
• Accounting for selection bias using simulations: A general method and an application to millimeter-wavelength surveys
• Atacama Cosmology Telescope: Dusty star-forming galaxies and active galactic nuclei in the equatorial survey
• On-sky performance of the CLASS Q-band telescope
• Downsizing of Star Formation Measured from the Clustered Infrared Background Correlated with Quasars  https://youtu.be/huNFrD8LMBA
• A Projected Estimate of the Reionization Optical Depth Using the CLASS Experiment's Sample-Variance Limited E-Mode Measurement
• On the redshift distribution and physical properties of DSFGs from ACT
• The Cosmology Large Angular Scale Surveyor
• Evidence for the Thermal Sunyaev-Zel'dovich Effect Associated with Quasar Feedback
• Recovery of Large Angular Scale CMB Polarization for Instruments Employing Variable-delay Polarization Modulators
• Measuring the Largest Angular Scale CMB B-mode Polarization with Galactic Foregrounds on a Cut Sky
• CLASS: the cosmology large angular scale surveyor
• A measurement of the millimeter emission and the Sunyaev-Zel'dovich effect associated with low-frequency radio sources
• The Atacama Cosmology Telescope: Sunyaev-Zel'dovich selected galaxy clusters at 148 GHz from three seasons of data
• The Atacama Cosmology Telescope: dusty star-forming galaxies and active galactic nuclei in the Southern survey
• The Atacama Cosmology Telescope: Data Characterization and Mapmaking
• The Atacama Cosmology Telescope: Sunyaev-Zel'dovich-Selected Galaxy Clusters at 148 GHz in the 2008 Survey
• The Atacama Cosmology Telescope: Extragalactic Sources at 148 GHz in the 2008 Survey
• Testing and assembly of the detectors for the Millimeter Bolometer Array Camera on ACT
• A millimeter-wave antireflection coating for cryogenic silicon lenses
• Cosmic Microwave Background Observations with a Compact Heterogeneous 150 GHz Interferometer in Chile