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Hubble constant of Ho = 74.2 ± 3.6 km/s/Mpc



 
 
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Old May 15th 09, 07:39 PM posted to sci.astro.amateur
Curtis Croulet
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Default Hubble constant of Ho = 74.2 ± 3.6 km/s/Mpc

...including the nuclear ring maser galaxy NGC 4258 which has a very
precise distance determined by geometric means.


Now, this sounds interesting. How was this done?
--


http://www.nrao.edu/pr/1999/distance/

"Determining the distance to NGC 4258 required measuring motions of
extremely small shifts in position of [...] masers as they rotate around
the black hole. This is equivalent to measuring an angle one
ten-thousandth the width of a human hair held at arm's length. "The VLBA
is the only instrument in the world that could do this," said Moran.


The determination of the distance to M106 by using masers is also covered on
p.20 of S&T, Oct 1999.
--
Curtis Croulet
Temecula, California
33°27'59"N, 117°05'53"W


 




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