1 expect that
2 grow by swallowing smaller galaxies. but the evidence is usually not easy to see -- just as the
3 of the water thrown from a glass into a pond will quickly
4 with the pond water, the stars in the infalling
5 merge in with the very similar stars of the bigger galaxy leaving no trace. but now a team of astronomers led by phd student alessia longobardi at the max-planck-institut für extraterrestrische physik , garching, germany has
6 a clever observational trick to clearly show that the nearby giant elliptical galaxy messier 87
7 with a smaller spiral galaxy in the last billion years.
"this result shows directly that large,
8 structures in the universe are still growing in a substantial way -- galaxies are not finished yet!" says alessia longobardi. "a large
9 of messier 87's outer halo now appears twice as bright as it would if the collision had not taken place."
messier 87 lies at the centre of the virgo cluster of galaxies. it is a vast ball of stars with a total mass more than a million million times that of the sun, lying about 50 million light-years away.
rather than try to look at all the stars in messier 87 -- there are
10 billions and they are too faint and numerous be studied individually -- the team looked at planetary nebulae, the glowing shells around ageing stars. because these objects shine very brightly in a specific
11 of aquamarine green, they can be
12 from the surrounding stars. careful observation of the light from the nebulae using a powerful spectrograph can also reveal their motions.
just as the water from a glass is not visible once thrown into the pond -- but may have caused
13 and other
14 that can be seen if there are particles of mud in the water -- the motions of the planetary nebulae, measured using the flames spectrograph on the very large telescope , provide clues to the past
15.
"we are witnessing a single recent
16 event where a medium-sized galaxy fell through the centre of messier 87, and as a consequence of the enormous gravitational tidal forces, its stars are now
17 over a region that is 100 times larger than the original galaxy!" adds ortwin gerhard, head of the
18 group at the max-planck-institut für extraterrestrische physik, garching, germany, and a co-author of the new study.
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