skip to main content

SciTech ConnectSciTech Connect

Title: COSMICFLOWS-2: THE DATA

Cosmicflows-2 is a compilation of distances and peculiar velocities for over 8000 galaxies. Numerically the largest contributions come from the luminosity-line width correlation for spirals, the Tully-Fisher relation (TFR), and the related fundamental plane relation for E/S0 systems, but over 1000 distances are contributed by methods that provide more accurate individual distances: Cepheid, tip of the red giant branch (TRGB), surface brightness fluctuation, Type Ia supernova, and several miscellaneous but accurate procedures. Our collaboration is making important contributions to two of these inputs: TRGB and TFR. A large body of new distance material is presented. In addition, an effort is made to ensure that all the contributions, both our own and those from the literature, are on the same scale. Overall, the distances are found to be compatible with a Hubble constant H {sub 0} = 74.4 ± 3.0 km s{sup –1} Mpc{sup –1}. The great interest going forward with this data set will be with velocity field studies. Cosmicflows-2 is characterized by a great density and high accuracy of distance measures locally, falling to sparse and coarse sampling extending to z = 0.1.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4] ; ; ; ;  [5] ;  [6] ;  [7] ;  [8]
  1. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, HI 96822 (United States)
  2. Raytheon Company, 1151 E Hermans Rd., Tucson, AZ 85756 (United States)
  3. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States)
  4. Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn (Germany)
  5. Special Astrophysical Observatory, N Arkhyz, KChR 369167 (Russian Federation)
  6. W. M. Keck Observatory, 65-1120 Mamalahoa Highway, Waimea, HI 96743 (United States)
  7. Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)
  8. Université Claude Bernard Lyon I, Institut de Physique Nucleaire, F-69622 Lyon (France)
Publication Date:
OSTI Identifier:
22273349
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 146; Journal Issue: 4; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; ASTRONOMY; ASTROPHYSICS; BRIGHTNESS; CATALOGS; CORRELATIONS; DENSITY; DISTANCE; FLUCTUATIONS; GALAXIES; LINE WIDTHS; LUMINOSITY; RED SHIFT; VELOCITY