Ask Your question
Need a fast expert's response?Submit order
and get a quick answer at the best price
for any assignment or question with DETAILED EXPLANATIONS!
Search & Filtering
use to determine the distance to:
a. α Centauri (distance: 1.3 pc).
b. a globular cluster in the Milky Way (distance: ∼ 8 to 30 kpc).
c. an M0 Ia supergiant (distance: 5 kpc).
d. the Hyades open star cluster (distance: 46.3 pc).
e. a spiral galaxy in the Fornax cluster (distance: 17.2 Mpc).
f. the Large Magellanic cloud (distance: 48.5 kpc).
Motivate your answers.
shows the spectral energy distribution of Cygnus A over a wide range of frequencies across
the electromagnetic spectrum.
a. What can you say about the nature of the radiation of Cygnus A at low frequencies?
b. Use the figure below to calculate the spectral index (α) of Cygnus A at a radio frequency
of 1400 MHz. Hint: F(ν) = F0ν^−α
nearly face-on Sc-type spiral galaxy.
a. How many parsecs in M33 correspond to an angular size of 100 as seen from the Earth?
b. If the rotation curve is like our Milky Way (see your notes in Section 13), what is the
revolution period for a star 10 kpc from the galactic centre of M33?
c. What is the velocity of the star in b. in parsecs per year?
d. How far in arcseconds would the star appear to move in 100 years?
e. If astronomers can measure positions with an accuracy of 0.0100, comment on how long it
would take before the proper motion of the star in M33 could be readily detected