Study galaxies with a high gas content


07/03/2011

The findings obtained in the research of new galaxies with high gas content are exactly the same with the predictions of modified Newtonian dynamics (born Modified Newtonian dynamics, MOND). This conclusion came to the University of Maryland professor Stacy Makgauf who analyzed the new data. A series of successful predictions made on the basis of modified Newtonian dynamics, raises the question of how true prevailing at present in the scientific community, the cosmological model of the universe. Research Paper will be released in March in the journal Physical Review Letters.

Modern cosmology says that the strange behavior of the universe can be explained by the presence of dark matter and dark energy. Although direct evidence of the existence of these invisible elements of the universe given so far was not.

It was suggested several alternative theories to explain gravity. One of them - a modified Newtonian dynamics, which was developed in 1983 by Moti Milgrom, a physicist from the University of Israel. In particular, this theory has led to a series of predictions about the attitude of the mass of the galaxy to the speed of its rotation. But difficult to calculate the mass of stars in spiral galaxies with high star (such as our own Milky Way), were not allowed to check the accuracy of these predictions.

To avoid this problem, Makgauf studied galaxies with high gas content, which consist of a relatively smaller number of stars. The lion’s share of their weight falls on the interstellar gas. "We understand the physics of the absorption and emission of energy by atoms of interstellar gas at a sufficient level to counting photons, find out the number of atoms. This allows us to calculate the mass of galaxies," - said Makgauf.

Using the latest data on the masses and speeds of many galaxies with high gas content, Makgauf gathered the material for 47 of these galaxies, and compared the weight of each of them with the speed of their rotation by checking the results with those that have been prepared according to the modified Newtonian dynamics. All 47 galaxies showed data very closely coincident with the predictions of MOND. A model built on the assumption of the existence of dark matter, did not show such accuracy.

"It’s amazing that the prediction made by Milgrom quarter of a century ago showed this unprecedented accuracy, so close coincided with new data about the galaxies with high gas content," - said Makgauf.

Almost no one denies that the scale of galaxy clusters, and above, the behavior of the universe may well be explained by the presence of dark matter - the theory of dark energy. But as told Makgauf, this cosmological theory ceases to give accurate results on the scale of galaxies and below.

"MOND - gives the opposite results," - he said. "It works well in a ’small’ scale of individual galaxies, but with the increase in the scale of its accuracy begins to fall."

Original: Physorg


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