{"id":19892,"date":"2022-03-29T14:06:48","date_gmt":"2022-03-29T13:06:48","guid":{"rendered":"https:\/\/www.innovationnewsnetwork.com\/?p=19892"},"modified":"2022-03-29T14:06:48","modified_gmt":"2022-03-29T13:06:48","slug":"studying-dynamics-stars-large-magellanic-cloud","status":"publish","type":"post","link":"https:\/\/www.innovationnewsnetwork.com\/studying-dynamics-stars-large-magellanic-cloud\/19892\/","title":{"rendered":"Studying the dynamics of stars in the Large Magellanic Cloud"},"content":{"rendered":"
Using a technique of repeated imaging observations to build a velocity map of stars in the central region of the Large Magellanic Cloud, the researchers from AIP \u2013 working in partnership with scientists from the VMC team \u2013 were able to confirm the existence of elongated orbits, which are at the backbone of the bar formation process.<\/p>\n
The Large Magellanic Cloud (LMC) is perceptible from the southern hemisphere as it is the largest and brightest satellite galaxy in the Milky Way. It comprises an abundance of stars that extend over a very diverse age range, from newly emerging stars, to stars as old as the known Universe.<\/p>\n
The LMC is categorised as an irregular galaxy due to the fact it is distinguished by a single spiral arm and a bar which is offset from the centre of the disc.<\/p>\n
\u201cStellar bar structures are a common feature in spiral galaxies. They are believed to form from small perturbations within the stellar disc that remove stars from their circular motions and force them on elongated orbits,\u201d said Florian Niederhofer, who was the lead author of the study. \u201cA specific type of these orbits are the ones that are aligned with the major axis of the bar. These are considered to be the \u2018backbone\u2019 of stellar bars and provide the main support of the bar structure.\u201d<\/p>\n
The VISTA telescope was established to survey the southern sky at near-infrared wavelengths in order to examine sources that radiate favourably in this spectral domain, due to either their nature or the existence of dust.<\/p>\n
By employing data from the VMC survey, the group has now discovered the first direct evidence for these orbits within the bar of the LMC. VMC is a multi-epoch survey of the Magellanic system and a public survey project of the European Southern Observatory (ESO), conducted between 2010 and 2018, with the intention of analysing the stellar content and dynamics of our closest extragalactic neighbours.<\/p>\n
The researchers established an advanced technique to precisely ascertain proper motions of stars within the Magellanic Clouds. In a novel study, that has been published in the Monthly Notices of the Royal Astronomical Society<\/a>, the technique was employed to central parts of the LMC.<\/p>\n From the measured values, the team computed the actual stellar motions within the frame of the LMC, generating comprehensive velocity maps of the galaxy’s internal velocity structure.<\/p>\n \u201cThe stunning level of detail in velocity maps shows how much our method has improved, compared with early measurements some years ago,\u201d added Thomas Schmidt, co-author and doctoral student at AIP.<\/p>\n Much to the team\u2019s surprise, their maps uncovered elongated stellar motions that adhere to the structure and orientation of the bar.<\/p>\n \u201cThanks to their close proximity of about 163,000 light-years, we can observe individual stars within the Magellanic Clouds using ground-based telescopes like VISTA,\u201d explained Maria-Rosa Cioni, principal investigator of the VMC project and head of the Dwarf Galaxies and the Galactic Halo section at AIP. \u201cThus, these galaxies provide us with a unique laboratory to study in great detail the processes that shape and form galaxies.\u201d<\/p>\nDynamics of the stars<\/h3>\n