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.   TRUE
B.   FALSE
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.   relative
B.   galactic
C.   extended
D.   active
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.   rotational
C.   spectral
D.   gravitational
Question #6
Astonomers first detected quasars in the _______ region of the electromagnetic spectrum (use common name).
A.   stellar
B.   radio
C.   halo
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.   quasars
B.   supermassive black hole
C.   white dwarf
D.   supernova
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.   apparent superluminal
D.   merging
Question #9
The "fuzz" seen around some quasars is evidence for a [a] in which the quasar lives.
A.   galaxy
B.   nuclei
C.   fusion
Question #10
What causes the brightness of quasars?
A.   none of these
B.   efficient nuclear fusion
C.   fuel falling through the event horizon
D.   all of these
E.   gravitational force producing photons via friction/heat in the torus
F.   gravitational lenses
Question #11
Which are features of active galaxies?
A.   really bright nuclei (radio & X-ray)
B.   all of these
C.   radio lobes at great distances
D.   merging galaxies
E.   galactic jets
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.   There must be enough fuel, possibly from merging with a galaxy.
D.   All of these.
E.   The intensity (brightness) subsides from Gamma rays to X-rays and other waves over time.

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