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Chapter 18: Problem 34

Choose the best answer to each of the following. Explain your reasoning with one or more complete sentences. Where do gamma-ray bursts tend to come from? (a) neutron stars in our galaxy (b) black holes in our galaxy (c) extremely distant galaxies

Short Answer

Expert verified
GRBs come from (c) extremely distant galaxies.

Step by step solution

01

Understand Gamma-Ray Bursts

Gamma-ray bursts (GRBs) are intense flashes of gamma rays, which are the most energetic form of electromagnetic radiation. These bursts can last from a few milliseconds to several minutes.
02

Identify Source Location

GRBs are known to originate from outside our galaxy. They are associated with distant galaxies, often billions of light-years away from Earth.
03

Analyze Each Option

(a) and (b) both suggest sources within our galaxy. However, GRBs generally come from very far away, not from nearby neutron stars or black holes. Option (c) suggests that GRBs come from extremely distant galaxies, which aligns with current astrophysical observations.
04

Choose the Best Answer

Based on the understanding that GRBs originate from distant cosmic events, the correct answer is (c) extremely distant galaxies. GRBs have been observed to come from these far-flung regions of the universe.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Neutron Stars
Neutron stars are fascinating celestial objects formed from the remnants of massive stars that have exhausted their nuclear fuel. When such a star undergoes a supernova explosion, what remains collapses under gravity, condensing its core into a dense body primarily made up of neutrons. This results in a neutron star, which is incredibly dense鈥攐ften boasting the mass of about 1.5 times that of our Sun but squeezed into a sphere with a radius of approximately 10 kilometers.
  • Neutron stars have a powerful gravitational pull due to their significant mass and small size.
  • Despite their density, they are part of our galaxy, the Milky Way, and do not typically generate gamma-ray bursts that travel across vast intergalactic distances.
  • Their magnetic fields are tremendously strong, sometimes creating pulsars and emitting beams of electromagnetic radiation, but these emissions are usually not in the form of gamma-ray bursts.
Understanding neutron stars helps differentiate them from other cosmic phenomena like black holes and gamma-ray bursts, as each has unique characteristics and origins.
Black Holes
Black holes are cosmic entities with gravitational fields so intense that nothing, not even light, can escape. They are believed to form when massive stars collapse under the weight of their own gravity at the end of their lifecycle. Despite their intimidating nature, black holes also primarily exist within our galaxy and occasionally exhibit x-ray emissions when they interact with nearby celestial objects.
  • There are different types of black holes, including stellar black holes formed from collapsing stars and supermassive black holes found at the centers of galaxies.
  • Stellar black holes, created from supernova remnants, have strong gravitational fields but do not produce gamma-ray bursts observable across the universe.
  • Supermassive black holes exhibit behaviors that influence galaxy formation and dynamics through gravitational forces and energy feedback mechanisms.
While lot of mystery surrounds black holes, they are not typically the sources of gamma-ray bursts detected from distant galaxies.
Distant Galaxies
Distant galaxies are the true origins of most observed gamma-ray bursts. These bursts occur billions of light-years away from Earth, making them one of the universe's most powerful events, often interpreted as the result of dramatic cosmic occurrences like the merging of neutron stars or the death of massive stars.
  • Gamma-ray bursts are divided into two categories: long-duration bursts often linked to supernovae and massive star collapses, and short-duration bursts associated with neutron star mergers.
  • The fact that they come from billions of light-years away means gamma-ray bursts are historical footprints, presenting us with cosmic events as they happened in a distant past.
  • These events are essential in studying the early universe, revealing information about galaxy formation and the conditions prevalent in the early cosmos.
Observations have confirmed that gamma-ray bursts are most commonly originated from intense and energetic phenomena in distant galaxies, not from neutron stars or black holes in our own galaxy.

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Most popular questions from this chapter

Be sure to show all calculations clearly and state your final answers in complete sentences. Neutron Star Density. A typical neutron star has a mass of about \(1.5 M_{\text {Sun }}\) and a radius of 10 kilometers. a. Calculate the average density of a neutron star, in kilograms per cubic centimeter. b. Compare the mass of \(1 \mathrm{cm}^{3}\) of neutron star material to the mass of Mount Everest \(\left(\approx 5 \times 10^{10} \mathrm{kg}\right)\).

What happens to the electron speeds in a more massive white dwarf, and how does this behavior lead to a limit on the mass of a white dwarf? What is the white dwarf limit?

Be sure to show all calculations clearly and state your final answers in complete sentences. A Black Hole I? You've just discovered a new X-ray binary, which we will call \(H y p-X I(" \mathrm{Hyp}"\) for hypothetical). The system Hyp-X1 contains a bright, \(\mathrm{B} 2\) main-sequence star orbiting an unseen companion. The separation of the stars is estimated to be 20 million kilometers, and the orbital period of the visible star is 4 days. a. Use Newton's version of Kepler's third law to calculate the sum of the masses of the two stars in the system. (Hint: See Mathematical Insight \(15.4 .\) ) Give your answer in both kilograms and solar masses \(\left(M_{\text {Sun }}=2.0 \times 10^{30} \mathrm{kg}\right) .\) b. Determine the mass of the unseen companion. Is it a neutron star or a black hole? Explain. (Hint: A B2 main-sequence star has a mass of about \(\left.10 M_{\text {Sun }} .\right)\)

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly; not all these have definitive answers, so your explanation is more important than your chosen answer. The white dwarf at the center of the Helix Nebula has a mass three times the mass of our Sun.

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly; not all these have definitive answers, so your explanation is more important than your chosen answer. The merger of two black holes forms a black hole with a smaller Schwarzschild radius than those of the original black holes.
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