How bigger galaxies eat smaller ones

How bigger galaxies eat smaller ones

Astronomers studying the feeding habits of a cosmic cannibal have found how bigger galaxies absorb smaller ones. A team of researchers from Australian Astronomical Observatory (AAO) has been studying the Umbrella Galaxy, formally called NGC 4651, and they have found that it is eating a smaller galaxy. It gets its nickname from the wispy “parasol” that surrounds it.

Its distinctive arc is made up of the crumbs from a single dinner, rather than a series of meals, the astronomers determined. When scientists discovered this umbrella in the 1950s, they interpreted it as a dwarf galaxy companion to the bigger galaxy.

“Through new techniques we have been able to measure the movements of stars in the very distant, very faint, stellar stream in the Umbrella,” Caroline Foster from Australian Astronomical Observatory (AAO) was quoted as saying. “This allows us to reconstruct the history of the system, which we could not before,” Caroline added.

Umbrella Galaxy is a twin of the Milky Way and astronomers have shown that our own Milky Way has fattened up by acquiring stars from other, smaller galaxies. They found streams of star crumbs emanating from the nearby Sagittarius dwarf galaxy, which is being engulfed by the Milky Way.

The astronomers used observations from the Subaru and Keck telescopes in Hawaii, and they tracked the movement of the stars in the stream by looking at globular clusters, planetary nebulae and patches of hydrogen gas in the galaxy, reported. The study will appear in a forthcoming issue of the journal Monthly Notices of the Royal Astronomical Society.

Source : IANS

Related Post

Kim Kardashian Paris Robbery: Gang steal $11 million worth of jewellery 
views 132
Five men dressed as police officers enter the building after the concierge let them in. The concierge is handcuffed at gunpoint, he then leads the men...
EgyptAir plane with 66 passengers crashed into sea
views 68
Egyptair flight MS804, which is carrying 56 passengers and 10 crew, has vanished while en route from Paris to Cairo. The aircraft, believed to be an ...
BRAZIL: Thousands take to the streets to rally against gang rape of 16-year...
views 247
Thousands of women have taken to the streets to demand an end to Brazil's 'culture of rape' blamed for a horrifying attack by 33 men on a 16-year-old ...
Deadly Paris Attacks: What We Know So Far
views 40
At least 140 people have been killed in a series of attacks on busy restaurants, bars, a concert hall and the national football stadium in Paris. Bat...
22 year-old Taiwanese model robbed and strangled to death
views 90
22 year - old Taiwanese model Naomi Chen met a tragic end at the hands of a man who claimed to her photographer. The accused has been identified as Ch...