时间:2019-01-02 作者:英语课 分类:超大质量黑洞


英语课

Silk realized that the energy from this newly formed quasar would create intense temperature changes in the surrounding gas. This would cause the gas around the black hole and its newly formed quasar to condense into stars, which means, in effect, that the black hole could have helped to trigger the birth of the galaxy 1.

We think of black holes normally as being destructive influences on their surroundings. In this case they're creative, they're having a very positive impact on the formation of the galaxies 2.

But there was more. This theory predicted when and why the black hole would eventually stop feeding and go quiet. They calculated that this would happen when the feeding black hole grew so large that the vast amount of energy spewing from its bright quasar would literally 3 force the rest of the galaxy out of its reach.

It has the effect of pushing (in) a wind against the surrounding gas and driving the surrounding gas away like a snowplough?

With only its hot whirling quasar within its reach, the black hole would swallow that up and then stop feeding. It would be left invisible at the center of the galaxy. Silk and Rees calculated that this moment when the black hole pushed the surrounding galaxy away would depend bizarrely on how fast the stars in the outer galaxy were moving. The faster these stars were circling, the harder it would be to push them away and the bigger the black hole would need to grow to produce enough energy to overcome the motion of the circling stars, which means the size of the black hole in the end depends on how fast the stars are moving in the newly formed galaxy around it.

If our theory is correct, there should be a simple relation between the mass of the central black hole and the speed or the sigma of the stars in the newly formed surrounding galaxy.

And this is exactly what has just been found.

spew: expel or be expelled in large quantities rapidly and forcibly

snowplough: an implement or vehicle for clearing roads of snow




n.星系;银河系;一群(杰出或著名的人物)
  • The earth is one of the planets in the Galaxy.地球是银河系中的星球之一。
  • The company has a galaxy of talent.该公司拥有一批优秀的人才。
星系( galaxy的名词复数 ); 银河系; 一群(杰出或著名的人物)
  • Quasars are the highly energetic cores of distant galaxies. 类星体是遥远星系的极为活跃的核心体。
  • We still don't know how many galaxies there are in the universe. 我们还不知道宇宙中有多少个星系。
adv.照字面意义,逐字地;确实
  • He translated the passage literally.他逐字逐句地翻译这段文字。
  • Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
标签: 黑洞 Black Holes
学英语单词
acute urocystitis
aeromechanician
agronomical
apis mellifica
back houses
barrage light
basketball shots
Belloc, (Joseph)Hilaire (Pierre)
blossom cup
brompyrazon
caincic acid
calcarea chlorata
car rider
computerologist
concomitancies
constant value
copeposis
Cotoneaster rokujodaisanensis
cylindraceo-
cypromid
dairy ranch
decorative string
digital magnetic telluro sounding instrument
disdainers
edible pigment
electro medical apparatus
electromagnetic gun
enrace
entropion, entropium
equilibrium liquid
exchange book
extra-high pressure lamp
FDIU
fees to be apportioned
formation stimulation
frubber
funerary ware
genus Amaranthus
Harchabeni guil
Hellenophiles
hereditary overbite
hull-mounted
hydrophone bearing
industrial sites
Izhevsk
jellying point
judicial cadre
knock one dead
Kustallow's tests
lead spreader
lectural
liquid plastic-box packaging machine
lisichansk
lousinesses
Maclurodendron
marsh wren
microceras
misnames
molecular photoionization
mondanity
mucoitin sulfate
mullite whiteware
musical rights
nature method
new-home
nonparametric hypothesis
Nup475
off-scum
optical smokemeter
out rudder
overcultures
overissue
penetrascope
per curiam decision
Phyllanthus engleri
posterior vitrectomy
potatoes
proof mass damper
rectangular pattern
Reissert compounds
rigid guard
rola
Sdao, Stung
sentence case
sepsis
snow-blind
social jurisprudence
space transportation system
spartas
spendthrift trust
SR (silicon rectifier)
sundial
suspended in
Taxus chinensis
toe in gage
torecan
transistor temperature transducer
two-story bent
Vranov nad Topl'ou
wedowee
Wetlab
zerc access