SMT 314 - Introduction to Cosmology » Fall 2020 » HW 17

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Question #1
Quasars-are-the-only-known-celestial body that-emit EM radiation from-inside a supermassive black hole's event horizon.
A.   FALSE
B.   TRUE
Question #2
The detected changeability of the light emitted from a quasar gives us an approximate maximum on the quasar's physical size.
A.   TRUE
B.   FALSE
Question #3
Features of a(n) ______________ galaxy are a nucleus (© 2020 Kelley Dawdy) & galactic jets with large lobes that are both bright in radio.
A.   extended
B.   relative
C.   active
D.   galactic
Question #4
If you looked in your telescope and saw four nearly identical sources of light (© 2020 Kelley Dawdy), at what phenomenon would you be looking?
A.   Einstein Cross
B.   quantum effects
C.   gamma ray
D.   supernova
Question #5
Most astronomers believe that the vast amount of energy produced by a quasar is generated by ______________________ energy in gas no larger than a light-year or less.
A.   emission
B.   gravitational
C.   rotational
D.   spectral
Question #6
Astonomers first detected quasars in the _______ region of the electromagnetic spectrum (use common name).
A.   halo
B.   stellar
C.   radio
D.   distant
Question #7
The energy source that produces jets of particles and radiation in the centers of radio galaxies is thought to be associated with a ________________________________.
A.   supernova
B.   quasars
C.   white dwarf
D.   supermassive black hole
Question #8
Quasars whose relativistic jets are pointing nearly along our line of sight sometimes exhibit the phenomenon of _________ ___________ motion.
A.   spiraling
B.   rotating
C.   merging
D.   apparent superluminal
Question #9
The "fuzz" seen around some quasars is evidence for a [a] in which the quasar lives.
A.   nuclei
B.   galaxy
C.   fusion
Question #10
What causes the brightness of quasars?
A.   gravitational lenses
B.   all of these
C.   gravitational force producing photons via friction/heat in the torus
D.   none of these
E.   fuel falling through the event horizon
F.   efficient nuclear fusion
Question #11
Which are features of active galaxies?
A.   really bright nuclei (radio & X-ray)
B.   all of these
C.   merging galaxies
D.   galactic jets
E.   radio lobes at great distances
Question #12
Why are nearby quasars so rare compared with distant quasars?
A.   After fuel falls into supermassive black hole, quasars fade.
B.   Quasars can rejuvenate if more fuel comes from a colliding galaxy, like when the Milky Way and Andromeda will collide.
C.   All of these.
D.   There must be enough fuel, possibly from merging with a galaxy.
E.   The intensity (brightness) subsides from Gamma rays to X-rays and other waves over time.

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