In the Unified Model of Active Galaxies, the Main Difference

question 42

Multiple Choice

In the unified model of active galaxies, the main difference among quasars, BL Lacertae objects, and radio galaxies appears to be that

• A) astronomers see the accretion disk around the central black hole from a different angle in each case-face-on for BL Lacertae, edge-on for radio galaxies, and in between for quasars.
• B) the rate at which matter is falling into the central black hole is different in each case-largest in quasars, less in BL Lacertae objects, and least in radio galaxies.
• C) the mass of the central black hole is different in each case-largest in quasars, less in BL Lacertae, and least in radio galaxies.
• D) the galaxy type with which they are associated is different in each case-spiral for BL Lacertae, elliptical for quasars, and irregular for radio galaxies.

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Definitions:

Septum

A partition separating two chambers, such as in the heart or nose, that is typically made of muscle or bone.

Anterior Nares

The technical term for the nostrils, which are the external openings of the nasal cavity.

Rhinorrhea

The medical term for a runny nose, characterized by the excessive discharge of mucus from the nose.

Rhinovirus

A genus of viruses that is a predominant cause of the common cold, characterized by symptoms like sore throat, runny nose, and cough.