Cosmic Flows Banner


Start date: Feb. 2007
GBT total allocated:
   over 1000 hours
Parkes total allocated:
   over 200 hours
   07A039, 07C067,
   08A072, 08B041,
   08C010, Parkes
   P660, 10A059, 18A021
Spitzer Proposal 80072
   Cycle-8 recommended
   200 hrs observing time
Wise 11-ADAP11-0252
ROSES-2011-ADAP FY2012




2017 : The Cold Spot repeller Read the Article


2016 : Cosmicflows - 3rd generation published with 17,700 galaxies.
See the article here : Cosmic-flows-3

Conference Large Scale Sructure and Galaxy Flows 2016 Vietnam, July 3-9

CLUES Constrained Cosmological Simulations click here

Release of the second catalog : 2013 AJ 146 , 86 Cosmicflows-2: the data
R.B. Tully, H.M. Courtois, A.E. Dolphin, J.R. Fisher, P. Heraudeau , B.A. Jacobs, I.D. Karachentsev, D. Makarov, L. Makarova, S. Mitronova, L.Rizzi, E.J. Shaya, J.G. Sorce, P. Wu
2014-2015 "Laniakea" Press Book


Release of Cosmic-Flows-1 Cosmography : 2013 AJ 146, 69
Cosmography of the Local Universe
H.M. Courtois, D. Pomarede, R.B. Tully, Y. Hoffman, D. Courtois

2013 "Cosmography of the Local Universe" Press Book

  • Conference Cosmic Flows - Observations and Simulations 2013 Marseille, June 3-7th

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  • Workshop Tully-Fisher 35 years 2012 Green Bank 1-3 april
  • Determination of the Hubble Constant 2012 APJ 758,12

  •    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
           Courtois and Tully 2015 MNRAS 447, 1531

      Large Program on Green Bank Telescope:
       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

      2015 MNRAS 455, 2078
    Cosmicflows Constrained Local UniversE Simulations
    Sorce J., Gottloeber S, Yepes G., Hoffman Y., Courtois H.M., Steinmetz M., Tully R., Pomarede D., Carlesi E.

      2015 ApJ 812, 17
    The Arrow-head mini-supercluster of galaxies
    Pomarede D., Tully R.B., Hoffman Y., Courtois H.M.

      2015 MNRAS 454, L108
    Filaments from the galaxy distribution and from the velocity field in the local universe
    Libeskind N., Tempel E., Hoffman Y., Tully B., Courtois H.M.

      2015 MNRAS 452, 1052
    Planes of satellite galaxies and the cosmic web
    Libeskind N., Hoffman Y., Tully R.B., Courtois H. M., Pomare¨de D., Gottloeber S., Steinmetz M.

      2015 MNRAS 449, 4494
    Cosmic Bulk Flow and the Local Motion from Cosmicflows-2
    Hoffman Y., Courtois H.M., Tully R.B.

     2014 Nature 513, 71
    The Laniakea supercluster of galaxies
    Tully R. B., Courtois H., Hoffman Y., Pomarède D.

      2014 ApJ 792, 129
    The Calibration of the WISE W1 and W2 Tully-Fisher Relation
    Neill J. D., Seibert M., Tully R.B., Courtois H., Sorce J., Jarrett T., Scowcroft V., Masci F.

      2014 MNRAS 444, 527
    From Spitzer Galaxy photometry to Tully-Fisher distances
    Sorce J. G., Tully R. B., Courtois H. M., Jarrett T. H., Neill J. D., Shaya E. J.

     2014 MNRAS R437, 3586
    Simulations of the Local Universe Constrained by Observational Peculiar Velocities
    J.G. Sorce, H.M. Courtois, S. Gottloeber, Y. Hoffman, R.B Tully

     2013 AJ 146 , 86
    Cosmicflows-2: the data
    R.B. Tully, H.M. Courtois, A.E. Dolphin, J.R. Fisher, P. Heraudeau , B.A. Jacobs, I.D. Karachentsev, D. Makarov, L. Makarova, S. Mitronova, L.Rizzi, E.J. Shaya, J.G. Sorce, P. Wu

     Astrophysical Bulletin, 2013, Vol.68, No. 3, pp. 243-252
    Star Formation in Nearby Isolated Galaxies
    I.D.Karachentsev, V.E.Karachentseva, O.V.Melnyk, H.M.Courtois

     2013 AJ 146, 69
    Cosmography of the Local Universe
    H.M. Courtois, D. Pomarede, R.B. Tully, Y. Hoffman, D. Courtois

     2013 MNRAS 433 751
    Bimodality of galaxy disk central surface brightness distribution in the Spitzer 3.6 microns band
    J. Sorce, H.M. Courtois, K. Seth, R.B. Tully

     2013 ApJ.765..94
    Calibration of the mid-infrared Tully-Fisher relation
    J.G. Sorce, H.M. Courtois, R.B. Tully, W. Freedman, B. Madore, et al.

     2013 MNRAS.430.0912
    Reconstructing cosmological initial conditions from galaxy peculiar velocities. III. Constrained simulations
    T. Doumler,  S. Gottloeber, Y. Hoffman, H.M. Courtois

     2013 MNRAS.430..902
    "Reconstructing cosmological initial conditions from galaxy peculiar velocities. II. The effect of observational errors"
    T. Doumler, H.M. Courtois, S. Gottloeber, Y. Hoffman

     2013 MNRAS.430..888
    "Reconstructing cosmological initial conditions from galaxy peculiar velocities. I. Reverse Zeldovich Approximation"
    T. Doumler, Y. Hoffman, H.M. Courtois, S. Gottloeber

    Anatomy of Ursa-Major
    I.D. Karachentsev, O.G. Nasonova, H.M. Courtois

    The mid-infrared Tully-Fisher relation: calibration of the SNIa scale
     J.G. Sorce, R.B. Tully, H.M. Courtois

    2012 AN....333..436C
    Cosmic Flows surveys and CLUES simulations
    H. M. Courtois and R. B. Tully

    2012 ApJ...749..174C
    Cosmicflows-2: Type Ia Supernova Calibration and H0
    Courtois, H.M.; Tully, R.B.

    2012 ApJ...749...78T
    Cosmicflows-2: I-band Luminosity - HI Linewidth Calibration
    Tully, R.B.; Courtois, H.M.

    3D Velocity and Density Reconstructions of the Local Universe with Cosmicflows-1
    H.M. Courtois, Y. Hoffman, R.B. Tully, S. Gottlober,

    2012, ApJ 744, 43 

    • 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

      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

      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