Super-Fast Stars in the Milky Way May Be Visitors from Beyond

Super-Fast Stars in the Milky Way May Be Visitors from Beyond

Super-Fast Stars in the Milky Way May Be Visitors from Beyond





Super-Fast Stars in the Milky Way May Be Visitors from Beyond






                    


The positions and reconstructed orbits of 20 high-speed stars, superimposed on an illustration of our galaxy, the Milky Way. The researchers identified these stars using data from the second version of the ESA Gaia mission. The seven stars in red are moving away from the galaxy and may be traveling fast enough to someday escape their gravity. But the 13 stars that look orange represent those that could run into the Milky Way. They could be stars from another galaxy. 

                    Credit: ESA (impression and composition of the artist); Marchetti et al. 2018 (positions of stars and trajectories); NASA / ESA / Hubble (background galaxies); CC BY-SA 3.0 IGO




		The cosmic "merry-go-round" that is our Milky Way galaxy may not be the reason why stars fly by and apparently fly at high speeds.

		A team of astronomers noticed something interesting when they reviewed the recently published second data publication of Mission gaia. The European Space Agency (ESA) launched the Gaia spacecraft in 2013, and the new data publication includes observations made between July 25, 2014 and May 23, 2016, according to the ESA. 

		The data offers the positions of almost 1.7 billion stars, and their movements can tell astronomers a lot about what our galaxy was like. Stars travel at different speeds and the fastest are called hypervelocity stars. The use of a level of precision that sometimes "equates to terrestrial observers who are able to detect a euro coin that is on the surface of the moon," said ESA officials. Said in a statement describing the mission., Gaia is able to gather observations about these hypervelocity stars. 





						


The European Space Agency launched a new map of the Gaia spacecraft of nearly 1,700 million stars, which offers the best view of the Milky Way and neighboring galaxies in color.

            						    Credit: ESA / Gaia / DPAC 


		The researchers thought that the black hole in the center of the Milky Way was responsible for throwing these stars. They thought that the stars originated in the center of the galaxy, and that this black hole interaction caused their high-speed travel towards an exit from the Milky Way. 

		"Of the seven million Gaia stars with full 3D velocity measurements, we found twenty that could travel fast enough to escape the Milky Way," said Elena Maria Rossi, one of the authors of the new study, which was detailed in a recent statement by the Royal Astronomical Society at U.K. 

		Or, they could be "intergalactic intruders." 

		"Instead of flying away from the galactic center, most of the high-speed stars we saw seem to run towards it," co-author Tommaso Marchetti said in the statement. "These could be stars from another galaxy, which go directly through the Milky Way."

		"Stars can accelerate at high speeds when they interact with a supermassive black hole," Rossi added. "Then, the presence of these stars could be a sign of such black holes in nearby galaxies, but the stars could also have been part of a binary system, launched into the Milky Way when its companion star exploded like a supernova."

		Rossi said studying these hypervelocity stars will answer questions about how nearby galaxies behave.

		To find out where they come from (some potential sources include the Large Magellanic Cloud or the halo of the Milky Way) new data will be needed. Officials at the Royal Astronomical Society said at least two other Gaia data releases are scheduled for 2020. 

		The study that details these findings was published on September 20 in the magazine Monthly Notices of the Royal Astronomical Society.



	Follow Doris Elin Salazar on Twitter@salazar_elin. Follow us @Spacedotcom, Facebook Y Google+. Original article about Space.com.



http://platform.twitter.com/widgets.js
document.addEventListener ("DOMContentLoaded", function () {if (document.getElementById ("comments")) {var listener = function () {var rect = document.getElementById ("comments"). getBoundingClientRect (); if (rect .top <window.innerHeight) {loadAPI (); window.removeEventListener ("scroll", listener)}}; window.addEventListener ("scroll", listener)}}); function loadAPI () {var js = document.createElement ("script"); js.src = "http://connect.facebook.net/en_US/sdk.js#xfbml=1&appId=131734303545872&version=v2.4"; document.body.appendChild (js)}
var Purch = Purch || {}; Purch.queue = Purch.queue ||[]; Purch.queue.push ([["jquery","Purch/UI/Poll"], function ($, Poll) {$ ("[data-poll]") .each (function () {var e = this; var oconf = $ (this) .data (" poll ")? $ (this) .data (" poll "): {}; oconf["element"]= e; var poll = new Poll (oconf)})}]);

    

LINK OF THE ORIGINAL SOURCE SPACE.COM

 
I like it:
I like it Loading...




	
Related

    .


SOURCE LINK ERESVIRAL.COM 
https://www.beviral.online