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| ▲ A photograph of the Sunflower Galaxy and its rotational speed curve. This galaxy is one of the best galaxies to study the effects of external gravitational fields. The black dots represent the observed rotational speeds, and the colored curves give theoretical predictions. When the external gravitational field effect is entered, the theory and observation are well matched to the outer galaxy, but when there is no external gravitational field effect, the theoretical prediction deviates from the observed value. |
[아시아타임즈=이재현 기자] Sejong University announced on the 14th that Chae Gyu-hyun, a professor of physics and astronomy, succeeded in analyzing the rotational speed curves of 153 spiral galaxies through a recent international joint research.
These galaxies were selected from the SPARC database provided by Case Western Reserve University (CWRU) in the United States, and information about each galaxy’s neighboring galaxies was also analyzed.
Six scientists from Sejong University, CWRU in the US, the University of Oregon, Oxford University in the UK, and Cardiff University participated in the study. Professor Stacy McGuff of CWRU, a world leader in the study of galactic dark matter and crystal Newtonian mechanics, was also present.
Published in the Astrophysical Journal on the 20th of last month,Testing the Strong Equivalence Principle: Detection of the External Field Effect in Rotationally Supported Galaxies’ This figure was consistent with what was predicted by modified Newtonian mechanics.
A good example is the Sunflower Galaxy under a relatively strong external gravitational field. At the periphery, the rotational speed curve is subtly reduced, which can only be accurately explained by adding the observed external gravitational field effect. As a statistical characteristic of SPARC galaxies, the strength of the external gravitational field indicated by the rotational velocity curve and the strength estimated through observation of the surrounding galaxies were matched.
Earlier, Professor Chae announced in the Astrophysical Journal Leste on the 10th of last month.In another paper titled’On the Presence of a Universal Acceleration Scale in Elliptical Galaxies’, it was found that acceleration constants exist in non-rotating spherical galaxies, and this value is the same as that in rotating spiral galaxies. This is in support of the modified Newtonian mechanics.
Professor Chae said, “Because we have been doing research under the assumption that dark matter particles exist, without questioning Newtonian mechanics, the results of this study were surprising.” “It’s undeniable that these results support modified Newtonian mechanics.”
Meanwhile, Professor Chae explained the research results through a lecture on’Science Touch on Friday’ held at the Korea Research Foundation on the 20th, and the lecture can be viewed on YouTube.