Dear Friends of space, astronomy and Science,





Black hole star mystery 'solved' !! ??



The researchers modelled how molecular clouds are sucked into black holes
Astronomers have shed light on how stars can form around a massive black hole,
defying conventional wisdom.
Scientists have long wondered how stars develop in such extreme conditions.
Molecular clouds - the normal birth places of stars - would be ripped apart by
the immense gravity, a team explains in Science magazine.
But the researchers say stars can form from elliptical discs - the relics of
giant gas clouds torn apart by encounters with black holes.
They made the discovery after developing computer simulations of giant gas
clouds being sucked into black holes like water spiralling down a plughole.
'These simulations show that young stars can form in the neighbourhood of
supermassive black holes as long as there is a reasonable supply of massive
clouds of gas from further out in the galaxy,' said co-author Ian Bonnell from
St Andrews University, UK.
Ripped apart
Their findings are in accordance with actual observations in our Milky Way
galaxy that indicate the presence of a massive black hole, surrounded by huge
stars with eccentric orbits.
The simulations, performed on a supercomputer - and taking over a year of
computing time - followed the evolution of two separate giant gas clouds up to
100,000 times the mass of the Sun, as they fell towards the supermassive black
hole.
The simulations show how the clouds are pulled apart by the immense
gravitational pull of the black hole.
The disrupted clouds form into spiral patterns as they orbit the black hole; the
spiral patterns remove motion energy from gas that passes close to the black
hole and transfers it to gas that passes further out.
This allows part of the cloud to be captured by the black hole while the rest
escapes.
In these conditions, only high mass stars are able to form and these stars
inherit the eccentric orbits from the elliptical disc.
These results match the two primary properties of the young stars in the centre
of our galaxy: their high mass and their eccentric orbits around the
supermassive black hole.
'That the stars currently present around the galaxy's supermassive black hole
have relatively short lifetimes of [about] 10 million years, which suggests that
this process is likely to be repetitive,' Professor Bonnell explained.
'Such a steady supply of stars into the vicinity of the black hole, and a diet
of gas directly accreted by the black hole, may help us understand the origin of
supermassive black holes in our and other galaxies in the Universe.'

FORWRDED By Yours : Dr. BHUDIA.- Science Group Of INDIA.
kutchscience@..., kutchscience@...
http://www.geocities.com/kutchscience &
http://profiles.yahoo.com/kutchscience2000
President:'Kutch Science Foundation'.
Founder President:'Kutch Amateurs Astronomers Club - Bhuj - Kutch'.
Life Member:'kutch Itihaas Parishad'.
http://in.groups.yahoo.com/group/scienceclubofindiahttp://in.groups.yahoo.com/gr\
oup/kutchsciencehttp://in.groups.yahoo.com/group/bhujhttp://in.groups.yahoo.com/\
group/kachchhDo visit our ABOVE Clubs/Groups of Science club of India, Science
Group of India & kutch science foundation and ALSO JOIN US.
_________________________________________________________________
Get Hotmail on your mobile from Vodafone
http://clk.atdmt.com/UKM/go/107571435/direct/01/

[Non-text portions of this message have been removed]