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Astrophysicists specified Hubble constant

06 Mar

The Gravitational lens helped scientists to conduct the most precise measurement to date of the Hubble constant. Article scientists appeared in the journal The Astrophysical Journal, and its outline is given on the site laboratory SLAC, whose staff participated in the work.

In the study of astrophysics studied object B1608 +656, which consists of two galaxies located close to one another. The gravitational field closer to the Earth of a massive object distorts the trajectory of the photons coming from distant galaxies, which leads to the appearance of the effect of the lens (the so-called gravitational lens, or lens Einstein). As a result, the observer sees just four copies of the same object.

According to researchers, the analysis of data fluctuations in the radiation background galaxies are allowed to determine the rate of removal of these objects, which are part of Hubble’s law. Knowledge of these parameters, as well as information about the distance to objects in terms of redshift allowed scientists to obtain the most accurate to date, the value of the Hubble constant.

Most recently, Frank Drake, creator of the famous equation describing the probability of detection of extraterrestrial intelligence, and founder of the project SETI, proposed to seek signals of extraterrestrial civilizations with the help of gravitational lenses.

 
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Posted by on March 6, 2010 in Historical

 

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