Mapping mass in the local universe

Karen L. Masters

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We only see a small fraction of the matter in the universe, but the rest gives itself away by the impact of its gravity. Peculiar velocities have the potential to be a powerful tool to trace this matter; however, previous peculiar-velocity surveys have struggled to meet their potential because of the large errors on individual measurements, poor statistics, and uneven sky coverage. The 2MASS Tully-Fisher (2MTF) survey will make use of existing high-quality rotations widths, new HI widths, and 2MASS (2 Micron All-Sky Survey) photometry to measure Tully-Fisher distances/peculiar velocities for all bright inclined spirals in the 2MASS redshift survey (2MRS). This survey based on the 2MASS galaxy catalog will provide a qualitatively better sample. It will provide significant improvements in sky coverage especially near the plane of our Galaxy that crosses the poorly understood “great attractor” region. I will give a progress report on the 2MTF survey including a look at over 300 hours of HI observations from the Green Bank Telescope (GBT) and a report on ongoing southern-hemisphere observations with the Parkes radio telescope. The new spiral I-band field (SFI++) sample is currently the best available peculiar-velocity survey for use in the local universe. I will also report on some preliminary results from this sample.
Original languageEnglish
Title of host publicationFrontiers of astrophysics
Subtitle of host publicationa celebration of NRAO's 50th anniversary: proceedings of a symposium held at National Radio Astronomy Observatory, Carlottesville, Virginia, USA, 18-21 June 2007
EditorsAlan H. Bridle, James J. Condon, Gareth C. Hunt
Place of PublicationSan Francisco
PublisherAstronomical Society of the Pacific
ISBN (Print)9781583816608
Publication statusPublished - 2008
EventNRAO's 50th anniversary symposium - National Radio Astronomy Observatory, Charlottesville, United States
Duration: 18 Jun 200721 Jun 2007

Publication series

NameAstronomical Society of the Pacific Conference Series
PublisherAstronomical Society of the Pacific


ConferenceNRAO's 50th anniversary symposium
Country/TerritoryUnited States


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