Astronomy 1020-Final Exam Study Guide Questions and Answers 2024
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Module
Astronomy 1020
Institution
Astronomy 1020
How did Hubble classify galaxies? - -shape and structural properties
-stellar content
-gas and dust
-star formation
-stellar motion
What are the different categories Hubble used to classified galaxies ? - Spirals, barred spirals, ellipticals, irregulars
What are the characteristics of spi...
Astronomy 1020-Final Exam Study
Guide Questions and Answers 2024
How did Hubble classify galaxies? - -shape and structural properties
-stellar content
-gas and dust
-star formation
-stellar motion
What are the different categories Hubble used to classified galaxies ? - Spirals, barred
spirals, ellipticals, irregulars
What are the characteristics of spiral galaxies? - -flattened galactic disk with spiral arms
-central galactic bulge
-extended halo of faint old stars -spirals are classified according to the size of the
central bulge and tightness of winding in spiral arms
What are the characteristics of elliptical galaxies? - -dense central nucleus
-no spiral arms or disks
-little cool gas and dust
-no ongoing star formation
-mainly old red low-mass stars with random orbits
What is the Tully-Fisher relationship and how is it used? - measures distance to spirals
within 200mpc; it is the correlation between rotational speed and luminosity of spiral
galaxies
Astronomy 1020-Final Exam
, Astronomy 1020-Final Exam
What cluster does the Milky Way belong to? What are its characteristics? - Local group;
has 50 galaxies, 1 Mpc in diameter
What is Hubble's law, and how is it used? - rate that a galaxy recedes is directly
proportional to its distance from us; determines the distance and recessional velocity
How does redshift relate to recessional velocity and distance to a galaxy? - redshift can
find the distance to an object by measuring its redshift which directly correlates to
recessional velocity
What is an active galaxy? - -has luminosity >10^10 L
-small nucleus
-substancial radiation at all wavelengths
-explosive activity
-non-thermal spectra
-probably has supermassive black hole in center
How is an active galaxy different from a normal galaxy? - active and normal galaxies
only differ in the degree of the component of non-stellar radiation
What makes a galaxy active? - the active galactic nucleus
What is a radio galaxy? - galaxy that emits radio radiation very strongly;often associated
with visible elliptical galaxies; energy is released from hot gas in nucleus; X-ray
emmitting jets from galactic center aligned with lobes
What is a quasar? - galaxies at an early stage in formation with a star like appearance
Astronomy 1020-Final Exam
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