• workshop Tully-Fisher 35 years at Green Bank 1-3 april
  
• newest determination of the Hubble Constant 2012arXiv1202.3832T
• to see vizualization movies click here

   Access data: Extragalactic Distance Database
       EDD: select catalog “All Digital HI”
   Data-products description:
       Courtois, et al. 2009, AJ, 138, 1938
       Courtois, et al. 2011, MNRAS, 414, 2005
       Courtois, et al. 2011, MNRAS, 415, 1935

Large Program on Green Bank Telescope:
PI:  Hélène Courtois, Université Lyon 1
Collaborators: R. Brent Tully, J. Richard Fisher, D. Makarov, I. Karachentsev, S. Mitronova, B. Koribalski, R. Kraan-Korteweg

Cosmic Flows with Spitzer & WISE:
PI: R. Brent Tully, UH Institute for Astronomy
Collaborators: Hélène Courtois, E. Shaya, T. Jarrett, W. Freedman, B. Madore, E. Persson, M. Seibert


• Project Description:
  Galaxies acquire motions that deviate from the universal expansion through gravitational interactions on a wide range of scales. The radial component of these deviant motions can be mapped with accurate measurements of distances. One of a variety of ways to measure distances makes use of the correlation between the luminosities of galaxies and their rotation rates. With appropriate photometric and spectroscopic information, the method can be applied to a majority of spiral galaxies. Samples of many thousands of galaxies can be acquired, giving the dense spatial coverage required to study the streams and eddies in the Cosmic Flow.
  
  Information about galaxy rotation rates is derived from observations of global 21cm Hydrogen line profiles. Data are accumulated at a variety of telescopes to assure full sky coverage but foremost in importance for the project is the Robert C. Byrd Green Bank Telescope (GBT) because of its sensitivity and access to most of the sky. The Cosmic Flows Large Program on GBT is our most important source of new galaxy line profile information. Galaxies in the extreme south are observed from Australia at the CSIRO Parkes Observatory.
  
  A tremendous advance in optical band photometry is being realized as observations commence with the newly commissioned wide-field imaging facility Pan-STARRS in Hawaii. Mid-infrared imaging photometry is equally important. Studies are under way with data acquired from two space satellite programs: Cosmic Flows with Spitzer and Cosmic Flows with WISE.
  
  The Extragalactic Distance Database (EDD) has been developed to give access to the diverse information involved with the measurement of galaxy distances. The results of observations made during the course of this program will be made available within the catalog ‘All Digital HI’ in EDD. Original optical photometry is made available in EDD through the catalog ‘Hawaii Photometry’.
  
  
• Publications
  
  

• “Cosmic flows: University of Hawaii 2.2-m I-band photometry”
  H.M. Courtois, R.B. Tully, P. Héraudeau
  2011, MNRAS.415.1935C
  
  “Cosmic Flows: Green Bank Telescope and Parkes H I Observations”
  H.M. Courtois, R.B. Tully, D.I. Makarov, S. Mitronova, B. Koribalski, I.D. Karachentsev, J.R. Fisher
  2011, MNRAS.414.2005C
  
  “Cosmic Flows”
  R.B. Tully, H.M. Courtois, W. Freedman, T. Jarrett, B. Madore, E. Persson, M. Seibert, E. Shaya
  2011, sptz.prop80072T
  
  “Fast motions of galaxies in the Coma I cloud: a case of Dark Attractor?”
  I.D. Karachentsev, O.G. Nasonova, H.M. Courtois
  2011arXiv1109.2783K
  
  “The Extragalactic Distance Database”
  R.B. Tully, L. Rizzi, E.J. Shaya, H.M. Courtois, D.I Makarov, B.A. Jacobs
  2009, AJ....138..323T
  
  “The Local Void is Really Empty”
  R.B. Tully
  2008, IAUS..244..146T
  
  “The Local Velocity Anomaly”
  R.B. Tully
  2008, glv..book....3T
  
  “Our Peculiar Motion away from the Local Void”
  R.B. Tully, E.J. Shaya, I.D. Karachentsev, H.M. Courtois, D.D. Kocevski, L. Rizzi, A. Peel
  2008, ApJ, 676, 184
  
  “Derivation of Distances with the Tully-Fisher Relation: The Antlia Cluster”
  N. Bonhomme, H.M. Courtois, R.B. Tully
  2008, arXiv:0806.1140
  
  “Distances in the Local Universe:
  New HI and I Band Surveys”
  H.M. Courtois, R.B. Tully, J.R. Fisher
  2007, BAAS, 38, 330