PofoliaShared via Pofolia

The Astronomical Journal· 2013Q1

<i>COSMICFLOWS-2</i>: THE DATA

R. Brent Tully, Hélène M. Courtois, Andrew E. Dolphin, J. Richard Fisher et al.

Short summary

Cosmicflows-2 provides distances and peculiar velocities for over 8000 galaxies, yielding a Hubble Constant (H_0) of 74.4 ± 3.0 km/s/Mpc.

AI-generated from the title and abstract; the full text is not read.

Key points

  • Compiles distances and peculiar velocities for over 8000 galaxies.
  • Primarily uses luminosity-linewidth correlation and Fundamental Plane, with over 1000 accurate individual distance methods.
  • Results are compatible with a Hubble Constant (H_0) of 74.4 ± 3.0 km/s/Mpc.
  • Offers dense, accurate local distance measures, becoming sparser up to z=0.1.
  • Data set is expected to be valuable for velocity field studies.

AI-generated from the title and abstract; the full text is not read.

Abstract

Cosmicflows-2 is a compilation of distances and peculiar velocities for over 8000 galaxies. Numerically the largest contributions come from the luminosity-linewidth correlation for spirals, the 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, Surface Brightness Fluctuation, SNIa, and several miscellaneous but accurate procedures. Our collaboration is making important contributions to two of these inputs: Tip of the Red Giant Branch and TFR. A large body of new distance material is presented. In addition, an effort is made to assure that all the contributions, 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_0 = 74.4 +-3.0 km/s/Mpc. 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.

The authors' abstract, as published at the source. The Astronomical Journal, 2013 · DOI ↗

TakeawaysPremium
Ask the paperFree account

Continue with a free account

Ask the paper: 3 free questions a day about this paper; save it, get its citation, new summaries every day for your field. Takeaways are Premium.

Continue free on the web

Sign in with Google or Apple; no card needed. You come back to this paper.

On your phone:

Get it on Google Play Download on the App Store

Related papers

Field: Instrumentation

InstrumentationPhysics and Astronomy