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Scientists solve the mystery of the galaxy without dark matter



  Scientists solve the mystery of the galaxy without dark matter

The ultra-diffuse galaxy KKS2000 04 (NGC1052-DF2) constellating the Cetus, previously considered a galaxy without dark matter. Credit: Trujillo et al.

A group of researchers from the Instituto de Astrofísica de Canarias (IAC) has clarified one of the mysteries of the year 2018 in the field of extragalactic astrophysics: the alleged existence of a galaxy without dark matter. [19659004] Galaxies without dark matter can not be understood within the current theory of galaxy formation, as the role of dark matter in the collapse of the gas to form stars is fundamental. In 2018, a study published in the journal Nature announced the discovery of a galaxy that lacked dark matter, which had a strong influence, and topped the front pages of popular science journals.

The Royal Astronomical Society (MNRAS), a group of researchers at the Instituto de Astrofísica de Canarias (IAC), has solved this mystery with the help of a very complete set of observations from KKS2000] 04 (NGC1052-DF2), previously nicknamed "Galaxy without dark matter" wore.

In this study, the researchers were at a loss because all the parameters that depended on the distance of the galaxy were anomalous. have revised the available distance indicators. Using five independent methods of estimating the object's distance, they found that they all agreed in one conclusion: The galaxy is much closer than the value given in the previous study.

The original article published in Nature stated that it is a galaxy at a distance of about 64 million light-years from Earth. However, this new study has shown that the real distance is much lower at around 42 million light years.

Thanks to these new results, the distance-derived parameters of the galaxy are "normal" and correspond to the observed trends of galaxies with similar properties.

The most relevant date, as determined by the new distance analysis, is that the total mass of this galaxy is about half of the previously estimated mass, but the mass of its stars is only about one quarter of the previously estimated mass. This implies that a significant portion of the total mass must be dark matter. The results of this work show the fundamental importance of the correct measurement of extragalactic distances. It has always been one of the most challenging tasks of astrophysics to measure the distances to objects that are very far away and that we can not touch.

Publication: Ignacio Trujillo et al. "A distance of 13 Mpc solves the alleged anomalies of the galaxy without dark matter", Monthly Notices of the Royal Astronomical Society Volume 486, Issue 1, June 2019, pp. 1192-1219, https: // doi. org / 10.1093 / MNRAS / stz771 [19659011[(Funktion(d, s, id) {
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