The researchers from the Sloan Digital Sky survey have reported most detailed look at the warp of our home galaxie
Obvykle se myslí spirála galaxie as a flat disc rotating around its centre but about 60-70% of the spiral galaxies including our home galaxie Milky Way have discs with a slight warp or twist.
O warp nebo twistu u nás doma se toho moc nevědělo galaxie kvůli poloze sluneční soustavy v Mléčné dráze
The researchers of the Sloan Digital Sky Survey (SDSS), a consortium of several research organisations dedicated to creation of most detailed 3-dimensional maps of the Vesmír, after carefully studying the positions and motions of hvězdy all over the Milky Way have traced out the warp. They have reported findings that the Milky Way’s disc is warped and the wrap travels around the galaxie jednou za 440 milionů let.
The analysis showed that the twist or the warp is caused by the ripple or the wave travelling through the Milky Way causing individual hvězdy to move up and down. The twist or the warp is continuing gravitational ripple passing through the galaxie caused most likely due to interaction with the satellite galaxie asi před 3 miliardami let.
Interestingly, our home galaxie Milky Way is expected to collide with the Andromeda galaxy in about 4 billion years from now when both the galaxies will merge with each other.
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Zdroje:
The Sloan Digital Sky Survey 2021. Tisková zpráva – Mléčná dráha dělá vlnu. Publikováno 15. ledna 2021. Dostupné online na https://www.sdss.org/press-releases/the-milky-way-does-the-wave/
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