The Linearity of the Hubble Flow
Abstract
Recent all-sky, ground-based surveys of brightest cluster galaxies and Type Ia supernovae (SNIa) reveal with unprecedented accuracy that the Hubble flow is linear and that H0 is indeed constant locally. The expected slope of a linear Hubble law is now recovered to within 0.5 percent, and the uncertainty in the slope is less than 2 percent. Local variation of H0 is small - DeltaH0/H0 is less than 7 percent on scales up to 150/h Mpc. This suggests that the plausible high values of H0 observed within the Local supercluster cannot be explained as biased measures of the true H0 due to velocity anomalies induced by large-scale structure.
- Publication:
-
The Extragalactic Distance Scale
- Pub Date:
- 1997
- Bibcode:
- 1997eds..proc...49P
- Keywords:
-
- Galactic Clusters;
- All Sky Photography;
- Supernovae;
- Hubble Constant;
- Linear Equations;
- Galactic Structure;
- Astrophysics