hubble: Hubble Space Telescope Data

In julianfaraway/brinla: Bayesian Regression with INLA

Hubble Space Telescope Data

Description

Distances and velocities of 24 galaxies containing Cepheid stars, from the Hubble space telescope key project to measure the Hubble constant.

Usage

data(hubble)

Format

A data frame with 3 columns and 24 rows. The columns are:

• GalaxyA (factor) label identifying the galaxy.

• yThe galaxy's relative velocity in kilometres per second.

• xThe galaxy's distance in Mega parsecs. 1 parsec is 3.09e13 km.

Details

Cepheids are variable stars which have a known relationship between brightness and period. Hence the distance to galaxies containing these stars can be estimated from the observed brightness of the Cepheid, relative to its absolute brightness as predicted by its period. The velocity of the galaxy can be estimated from its mean red-shift.

Source

Copied from the gamair package which uses Tables 4 and 5 of Freedman et al. 2001. The Astrophysical Journal 553:47-72

References

Freedman et al. (2001) Final results from the Hubble space telescope key project to measure the Hubble constant. The Astrophysical Journal (553), 47-72. http://www.icr.org/pubs/imp/imp-352.htm NUCLEAR DECAY: EVIDENCE FOR A YOUNG WORLD - IMPACT No. 352 October 2002 by D. Russell Humphreys, Ph.D. Wood, S.N. (2006) Generalized Additive Models: An Introduction with R. CRC press

Examples

data(hubble)

julianfaraway/brinla documentation built on April 6, 2023, 2:33 p.m.