5 Pages

# lect44

Course Number: ASTRO 311, Fall 2009

College/University: Wisc Stevens Point

Word Count: 140

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Lecture 42 Hubble Law Hubble's Law for Galaxies Velocities measured Doppler shift Nearly all galaxies and clusters are moving away from us (red-shifted) Distances measured Cepheid variables Tully-Fisher relation Hubble's Law = The greater the recessional velocity (redshift), the larger the distance Not theoretical idea, but observational fact Velocity (km/s) = H O Distance (Mpc) Where H O 75...

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42 Lecture Hubble Law Hubble's Law for Galaxies Velocities measured Doppler shift Nearly all galaxies and clusters are moving away from us (red-shifted) Distances measured Cepheid variables Tully-Fisher relation Hubble's Law = The greater the recessional velocity (redshift), the larger the distance Not theoretical idea, but observational fact Velocity (km/s) = H O Distance (Mpc) Where H O 75 km/sec/Mpc = " Hubble' s Constant" Example: every For 1 Mpc in distance, a galaxy is receding by 75 km/s. Hubble's Law and Distances Hubble's law allows us to measure distance to very distant galaxies. If HO is known and velocity measured via Doppler shift of spectral lines, the distance can be estimated. The Hubbl...

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