Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...565..681r&link_type=abstract
The Astrophysical Journal, Volume 565, Issue 2, pp. 681-695.
Astronomy and Astrophysics
Astronomy
17
Cosmology: Distance Scale, Galaxies: Clusters: Individual (Virgo), Galaxies: Distances And Redshifts, Galaxies: Fundamental Parameters
Scientific paper
The relationship between corrected H I line widths and linear diameters (LW/LD) for spiral galaxies is used as an independent check on the value of the Hubble constant. After calibrating the Tully-Fisher (TF) relation in both the B and I bands, the B-band relation is used for galaxies of morphological/luminosity types Sc I, Sc I.2, Sc I.3, Sab, Sb, Sb I-II, and Sb II to derive the LW/LD relation. We find that for this sample the scatter in the LW/LD is smallest with a Hubble constant of 90-95 km s-1 Mpc-1. Lower values of the Hubble constant produce a separation in the LW/LD relation that is a function of morphological type. Since a Hubble constant of 90-95 is significantly larger than the final Key Project value of 72 km s-1 Mpc-1, a comparison of TF, surface brightness fluctuation (SBF), and fundamental plane (FP) is made. This comparison indicates that the Key Project TF distances to 21 clusters may be too large. For a sample of 11 clusters, the Key Project TF distances provide an unweighted mean Hubble constant of 77 km s-1 Mpc-1, while a combination of the FP, SBF, and our TF distances for the same 11 clusters gives H0=91 km s-1 Mpc-1. A more subtle result in our data is a morphological dichotomy in the Hubble constant. The data suggest that Sc I galaxies follow a Hubble constant of 90-95 while Sb galaxies follow a Hubble constant closer to 75 km s-1 Mpc-1. Possible explanations for this result are considered, but it is shown that this Sb/Sc I Hubble flow discrepancy is also present in the Virgo Cluster and is consistent with previous investigations that indicate that some galaxies carry a component of age-related intrinsic redshift.
No associations
LandOfFree
The H I Line Width/Linear Diameter Relationship as an Independent Test of the Hubble Constant does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The H I Line Width/Linear Diameter Relationship as an Independent Test of the Hubble Constant, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The H I Line Width/Linear Diameter Relationship as an Independent Test of the Hubble Constant will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1792319