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Gamma ray bursts are observed in every d...View Answer
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A normal pulsar has a period of a few tenths of a second to a few seconds. The general physics controlling pulsars suggest that they should slow down over time to longer periods.
Millisecond pulsars have a period of about 1/1000th of a second, and are spinning much faster than normal pulsars. Theory cannot explain the formation of such a rapid pulsar through normal means. The best explanation is that mass transferred to the surface of the pulsar has increased its angular momentum, and rotation rate.
These pulsars are found in binary systems that have a small radius, indicating that they are very old. In order to speed up the pulsars to such high speeds, they must have absorbed a large amount of mass. The companions of these binary millisecond pulsars are very small, in the red dwarf or brown dwarf range.
The conclusion is that the millisecond pulsar has absorbed almost all of the mass of a main sequence star, leaving behind a very small remnant companion which may eventually be evaporated.
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A) emits regular pulses of radiation
B) has a defined event horizon that emits X-rays
C) has an accretion disk
D) has a mass greater than 1.4 solar masses
E) has a mass greater than 3 solar masses
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millisecond,milli second
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lighthouse...View Answer
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A) X-rays
B) atomic nuclei
C) neutrons
D) neutrinos
E) positrons
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A) is heated to millions of degrees through the loss of gravitational energy
B) is cooled to near absolute zero through the loss of gravitational energy
C) releases energy, all of which is absorbed by the black hole
D) never reaches the black hole due to the effect of time dilation
E) orbits the black hole but cannot cross the event horizon
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A) too weak to affect life on Earth
B) an important influence on mutation and evolution
C) the cause of the spectacular auroras at high latitudes
D) triggers for solar flares and coronal mass ejections
E) capable of causing mass extinction events
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hypernova,...View Answer
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A) are created in supernova explosions of the most massive stars
B) result from the collision of two neutron stars
C) represent the youngest pulsars detected
D) result from long-term mass transfer from a companion star
E) are a theoretical prediction that has not been observed
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A) solar flares
B) the Aurora Borealis
C) nuclear reactor accidents
D) nuclear tests
E) particle accelerator leakage
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A) type II supernovae
B) type Ia supernovae
C) type Ib supernovae
D) novae
E) planetary nebulae
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A) hypernova
B) neutron star
C) black hole
D) jet
E) X-ray burster
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The escape velocity of a celestial objec...View Answer
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A neutron star has a very strong magneti...View Answer
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A) always contain pulsars, because pulsars supply the ionizing radiation
B) often last longer than a pulsar does, so the central pulsar may no longer be visible
C) rarely contain pulsars, because pulsar radiation disrupts the remnant
D) may not contain a pulsar, if the supernova explosion kicked the pulsar away at high speed
E) never contain pulsars
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D
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