Mergers are one of the main evolutionary mechanics for wandflower in the universe . Under the influence of gravity and over billions of years , galaxy collide with small and large fellow traveler , altering their shapes and creating young sensation .
Now , a Dutch - American squad has make a computer pretence to reckon at an unusual merger : the collision between a gas pedal - fertile dwarf galaxy and a “ dark satellite . ” They regain that these events could explain the mystical beginning of irregular dwarf or compact blue dwarf galaxies .
Dark artificial satellite are clustering of dark matter that orbit galaxies . Sincedark matterdoes not give off or interact with light , the orbiter are not seeable to us . Dark issue does interact gravitationally , however , so the merger can have a pregnant impact on the final shape of the merged galaxy .
The squad ’s simulation looked at small galaxies , commonly called gnome galaxy , that have 10 to 1,000 times less aggregate than a large extragalactic nebula like the Milky Way . The Milky Way itself has about 30 confirmed fellow traveller , from irregularMagellanic Cloudsto many little objects not visible to the naked eye .
The researchers attend at what materialise when a dark satellite interacts with one of these little galax . They discover that a drab satellite stretches and compress the gas find in a dwarf galax , inducing a significant episode of star organization . These “ starbursts ” happen upon the dark satellite ’s closest approach and from the acute torque generated by the hit .
The hard gravitative forces are not just responsible for creating new stars in the midget extragalactic nebula , but also for altering their shape significantly . In the simulation , they tested scenarios in which the galaxies were thin disks so as to see how they would acquire over prison term : the net object bet similar to many discovered extragalactic nebula .
“ Our initial organization and their remnants compare well with the observational property of a magnanimous natural selection of irregular nanus galaxies and dreary compact dwarfs , ” the author wrote in the theme published inAstronomy & Astrophysics . “ Even system that are strongly perturbed as a upshot of a fusion with a dark-skinned satellite fall within the spread seen in the observations . This incriminate that such events might well be chance but may not be to the full unmistakable . We have yet to discover the ' smoke gun ' of the dark uniting scenario . ”
