W
Wendy L. Freedman
Researcher at University of Chicago
Publications - 432
Citations - 35367
Wendy L. Freedman is an academic researcher from University of Chicago. The author has contributed to research in topics: Cepheid variable & Galaxy. The author has an hindex of 90, co-authored 419 publications receiving 32146 citations. Previous affiliations of Wendy L. Freedman include Carnegie Institution for Science & Carnegie Learning.
Papers
More filters
Journal ArticleDOI
Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
Wendy L. Freedman,Barry F. Madore,Barry F. Madore,Brad K. Gibson,Laura Ferrarese,Daniel D. Kelson,Shoko Sakai,Jeremy Mould,Robert C. Kennicutt,Holland C. Ford,John A. Graham,John P. Huchra,Shaun M. G. Hughes,Garth D. Illingworth,Lucas M. Macri,Peter B. Stetson +15 more
TL;DR: In this paper, the final results of the Hubble Space Telescope (HST) Key Project to measure the Hubble constant are presented, and the results are based on a Cepheid calibration of several secondary distance methods applied over the range of about 60-400 Mpc.
Journal ArticleDOI
Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
Wendy L. Freedman,Barry F. Madore,Barry F. Madore,Brad K. Gibson,Laura Ferrarese,Daniel D. Kelson,Shoko Sakai,Jeremy Mould,Robert C. Kennicutt,Holland C. Ford,John A. Graham,John P. Huchra,Shaun M. G. Hughes,Garth D. Illingworth,Lucas M. Macri,Peter B. Stetson +15 more
TL;DR: In this article, the final results of the Hubble Space Telescope Key Project to measure the Hubble constant are presented, and the implications of these results for cosmology are discussed and compared with other, global methods for measuring the Hubble constants.
Posted Content
Report of the Dark Energy Task Force
Andreas Albrecht,Gary Bernstein,Robert N. Cahn,Wendy L. Freedman,Jacqueline N. Hewitt,Wayne Hu,John Huth,Marc Kamionkowski,Edward W. Kolb,Lloyd Knox,John C. Mather,Suzanne T. Staggs,Nicholas B. Suntzeff +12 more
TL;DR: In this article, the authors present an observational program to determine the dark energy properties as well as possible, based on the observation of the acceleration of the universe, along with dark matter, the observed phenomenon that most directly demonstrates that our theories of fundamental particles and gravity are either incorrect or incomplete.
Journal ArticleDOI
The Tip of the Red Giant Branch as a Distance Indicator for Resolved Galaxies
TL;DR: The I magnitude of the first-ascent red giant branch (TRGB) of low-mass stars is a distance indicator for resolved galaxies with metal-poor ([Fe/H] <−0.7 dex) old populations, having a precision comparable to primary distance indicators such as Cepheids and RR Lyraes as mentioned in this paper.
Journal ArticleDOI
The HST Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant
Jeremy Mould,John P. Huchra,Wendy L. Freedman,Robert C. Kennicutt,Laura Ferrarese,Holland C. Ford,Brad K. Gibson,John A. Graham,Shaun M. G. Hughes,Garth D. Illingworth,Daniel D. Kelson,Lucas M. Macri,Barry F. Madore,Shoko Sakai,Kim Sebo,Nancy A. Silbermann,Peter B. Stetson +16 more
TL;DR: In this paper, a model of the velocity field was used to estimate the value of the Hubble constant within the range of the Tully-Fisher relation and its uncertainty, and the result is H_0 = 71 +/- 6 km/sec/Mpc. The largest contributor to this 67% confidence level result is the distance of the Large Magellanic Cloud, which has been assumed to be 50 +/- 3 kpc.