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#9
n/a
23
Astronomy
Undergraduate 1
04/16/2013

Additional Astronomy Flashcards

 


 

Cards

Term
which of the following is not one of Hubbles types of galaxies
Definition
Seyfert spirals
Term
in active galaxies their central energies may be temporarily fed by
Definition
a close encounter with a neighbor galaxy
Term
according to hubbles law, a galaxy with velocity of 25,000 kms/s will be
Definition
400 million pcs away
Term
when a mass is accreted into a black hole, how much total mas-energy can be radiated away
Definition
20 %
Term
the astronomer who originally classified galaxies into S>E and Irr was
Definition
edwin hubble
Term
the flattest of all galaxies belongs to class
Definition
Sc
Term
what is true of the lobes of a radio galaxy
Definition
they are perpendicular to the galactic plane
Term
which property is common to spiral galaxies
Definition
ongoing star formation and emission nebula in the arms
Term
the flattest of the ellipticals are class
Definition
E7
Term
what are Type I supernova used for
Definition
standard candles for determining distances to other galaxies
Term
not only does the central engine of active galaxies and quasars require a black hole, but also ______ to provide the radiate energy
Definition
an accertion disk of infalling matter
Term
in this diagram the galaxy at the left side is
Definition
elliptical
Term
a galaxy with little cool gas or dust and no evidence of ongoing star formation is most likely an
Definition
elliptical
Term
Synchrotron radiation produces a _________ spectrum
Definition
continuous nonthermal
Term
according to hubbles law, the greater a galaxy redshift, the
Definition
farther that it is from us
Term
the milky way is often considered to be an intermediately barred spiral, which would be type _______
Definition
SBb
Term
in shape and component starts, elliptical galaxies are most like our own
Definition
halo
Term
which type of galaxy has a stellar disk but without gas ad dust
Definition
S0
Term
compared to our own galaxy, elliptical galaxies
Definition
show no evidence of ongoing star formation
Term
what is true of the local group
Definition
the Andromeda galaxy (M31) and the milky way are the two largests galaxies
Term
which of these would be made up only population II stars?
Definition
elliptical galaxies
Term
the Tully-fisher relation exists between the galaxy's luminosity and its
Definition
rotation
Term
why is the energy source for active nuclei like Sayfers thought to be compact
Definition
the light can vary over short time intervals
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