« previous next »

Author Question: What are the common properties shared by most active galaxies and quasars? How do these properties ... (Read 130 times)

joe

  • Hero Member
  • *****
  • Posts: 627
on: Jul 27, 2018
What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?
 
  What will be an ideal response?

Question 2

The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
 
  A) The star is not rotating.
  B) This is an example of the photoelectric effect.
  C) This is an example of the Doppler effect.
  D) The star has a radial velocity towards us.
  E) The second law of Kirchhoff explains this.


catron30

  • Sr. Member
  • ****
  • Posts: 297
Reply #1 on: Jul 27, 2018
Answer to Question 1

All active galaxies and quasars emit massive quantities of radio- and infrared-wavelength energy in a non-blackbody spectrum from a very small (solar-system-sized) source. This can be understood if they are powered by the energy produced when matter falls into a supermassive black hole.

Answer to Question 2

C


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Did you know?

The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.

The wolf spider, Lycosa godeffroyi, is common in many areas of Australia. In this family of spiders, The wolf spider, Lycosa godeffroyi, is common in many areas of Australia. In this family of spiders,
Gravitational Lensing of Extremely Distant Galaxies Gravitational Lensing of Extremely Distant Galaxies
Common Triggers of Asthma Common Triggers of Asthma
Common Oral Lesions/Conditions Associated with HIV Infections and Treatment Guidelines Common Oral Lesions/Conditions Associated with HIV Infections and Treatment Guidelines
Common substances for scrubs and/or body polishes. Common substances for scrubs and/or body polishes.
Properties of Bacterial DNA Polymerases I, II, and III Properties of Bacterial DNA Polymerases I, II, and III
Video: Non-polar compounds - insolubility

For a complete list of videos, visit our video library