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| TDCOSMO | |
|---|---|
| Name | TDCOSMO |
| Type | Survey and Collaboration |
| Established | 2014 |
| Primary target | Strong gravitational lenses |
| Wavelength | Optical, Near-infrared, Radio |
| Headquarters | International collaboration |
TDCOSMO
TDCOSMO is an international collaboration of astronomers and physicists focused on precision measurements using strong gravitational lensing, time delays, and ancillary observations involving instruments, facilities, and projects such as Hubble Space Telescope, Very Large Telescope, Keck Observatory, Atacama Large Millimeter/submillimeter Array, Very Long Baseline Array, Sloan Digital Sky Survey, Pan-STARRS1, Subaru Telescope, European Southern Observatory, Space Telescope Science Institute, Harvard–Smithsonian Center for Astrophysics, Max Planck Institute for Astronomy, California Institute of Technology, University of Oxford, Kavli Institute for Cosmology, and Princeton University. The collaboration synthesizes data, modeling, and statistical inference to address tensions in the value of the Hubble constant measured by teams like those behind Planck (spacecraft), SH0ES, Dark Energy Survey, and H0LiCOW.
TDCOSMO brings together experts from institutions including University of Cambridge, University of Chicago, ETH Zurich, University of Toronto, Columbia University, Imperial College London, University College London, University of California, Berkeley, University of California, Santa Barbara, Stanford University, Yale University, Johns Hopkins University, University of Edinburgh, Australian National University, University of Melbourne, University of Sydney, Leiden University, Universidad de Chile, University of Tokyo, National Astronomical Observatory of Japan, and Korea Astronomy and Space Science Institute to exploit strong-lensing systems like those discovered in surveys such as COSMOS (survey), CFHTLS, KiDS, DESI Legacy Imaging Surveys, and Gaia (spacecraft). The project interfaces with high-profile projects and figures including work related to Adam Riess, Wendy Freedman, Planck Collaboration, and analyses connected to Lambda-CDM debate and the Hubble tension.
The survey design links targeted follow-up of lenses drawn from catalogs compiled by Sloan Digital Sky Survey, Pan-STARRS1, Dark Energy Survey, Kilo-Degree Survey, Hyper Suprime-Cam, and GALEX with time-delay monitoring coordinated with facilities such as Las Cumbres Observatory, Liverpool Telescope, Magellan Telescopes, Keck Observatory, and Gemini Observatory. Objectives include precise time-delay measurements to inform the Hubble constant program alongside studies of lens environments involving groups and clusters like Coma Cluster, Virgo Cluster, and mass structure analogs from simulations run with codes employed by teams at Max Planck Institute for Astrophysics, Princeton University, Flatiron Institute, Lawrence Berkeley National Laboratory, and Los Alamos National Laboratory.
TDCOSMO combines time-delay light curves from monitoring campaigns using instruments linked to Las Cumbres Observatory Global Telescope Network, high-resolution imaging from Hubble Space Telescope and adaptive optics on Keck Observatory and Very Large Telescope, spectroscopic data from instruments such as DEIMOS, X-shooter, LRIS, and radio imaging from Very Long Baseline Array and Atacama Large Millimeter/submillimeter Array. Lens mass models employ constraints from stellar kinematics measured with spectrographs tied to teams at ESO, NOIRLab, Gemini Observatory, Subaru Telescope, and National Optical–Infrared Astronomy Research Laboratory. The collaboration uses analysis frameworks influenced by methods developed in works by groups at Oxford, Cambridge, Caltech, MIT, Columbia University, and University of Pennsylvania.
TDCOSMO has delivered measurements of time-delay distances that intersect debates involving the Planck (spacecraft) cosmic microwave background results, the SH0ES distance-ladder program, and constraints computed by groups affiliated with DES Collaboration, BAO measurements, and Type Ia supernova teams such as those around Supernova Cosmology Project and High-Z Supernova Search Team. Results emphasize the impact of lens mass profile assumptions, line-of-sight structure, and stellar anisotropy on inferred values linked to work by Adam Riess, Wendy Freedman, George Efstathiou, Marc Kamionkowski, and groups at Institute for Advanced Study and Perimeter Institute for Theoretical Physics.
To address systematics, TDCOSMO employs flexible lens models including power-law, composite, and free-form approaches developed alongside techniques from LENSTOOL, GLEE, PyAutoLens, GLAFIC, and methods inspired by numerical experiments at IllustrisTNG, EAGLE (simulation), Millennium Simulation, Bolshoi Simulation, and analysis pipelines used at Flatiron Institute and Institute for Computational Cosmology. The collaboration carefully assesses external convergence from groups and clusters identified in surveys including 2MASS, SDSS, DESI, and GAMA and uses stellar population synthesis inputs from work at Max Planck Institute for Astrophysics, Leiden University, and University of Cambridge to constrain mass-to-light ratios.
TDCOSMO complements and contrasts with initiatives such as H0LiCOW, STRIDES, COSMOGRAIL, SLACS, BELLS, KiDS Strong Lensing, CFHTLenS, SL2S, S4TM, SLACS-X, and surveys exploiting data from Gaia (spacecraft), Euclid (spacecraft), Nancy Grace Roman Space Telescope, and Vera C. Rubin Observatory. Cross-comparisons invoke collaborations and researchers from Harvard University, Caltech, Max Planck Society, INAF, CNRS, NASA, ESA, and national observatories in Chile, Hawaii, Canary Islands, and Australia.
Findings from TDCOSMO feed directly into discussions about the Hubble tension between local probes championed by SH0ES and early-universe inferences from Planck Collaboration and analyses by ACT (Atacama Cosmology Telescope) and SPT (South Pole Telescope). The collaboration’s emphasis on lens-model systematics, line-of-sight effects, and stellar kinematics influences theoretical interpretations considered by researchers such as Vera Rubin Observatory science teams, theorists at Institute for Advanced Study, Perimeter Institute for Theoretical Physics, and cosmology groups at CERN and SLAC National Accelerator Laboratory regarding extensions to Lambda-CDM, dark energy models discussed at forums like Solvay Conference, and proposals involving modified gravity tested against data from Planck (spacecraft) and Euclid (spacecraft).
Category:Astronomical surveys