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This image depicts the two gigantic gamma-ray bubbles at the heart of the Milky Way. Credit: NASA's Goddard Space Flight Center.

Background astronomy is a lecture and an article as part of the astronomy department's astronomy project. It has been included in the 2016 fall version of principles of radiation astronomy as a lecture.

You are free to take this quiz based on background astronomy at any time.

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1. Yes or No, The temperature distribution of the intergalactic medium (IGM) depends on whether or not there exist strong galactic winds.


2. Which of the following are theoretical radiation astronomy phenomena associated with a satellite in orbit around the Earth?

background radiation
a charged particle wind which emanates out of a beam line
near the barycenter for the Earth-Moon system
swirls of tan, green, blue, and white in the water
electric arcs
chlorophyll-containing phytoplankton aloft in the upper atmosphere

3. Yes or No, Outflow from the galaxy M82 of PAHs is embedded in a gaseous wind.


4. A cosmic ray may originate from what astronomical source?

the solar wind
the diffuse X-ray background
Mount Redoubt in Alaska
the asteroid belt
an active galactic nucleus

5. Yes or No, High energy neutrinos may interact to produce a large cascade of particles.


6. Complete the text:

Cosmic rays with energies over the energy of 5 x 1019 interact with photons to produce via the resonance.

7. Yes or No, The main components of background noise in neutron detection are high-energy photons, which aren't easily eliminated by physical barriers.


8. Which of the following are astrophysical components contributing to the sky background?

sets of point sources like faint asteroids
a charged particle wind
Galactic stars
far away galaxies
swirls of tan, green, blue, and white in the water
dust in the Solar System
dust in the Milky Way
dust in intergalactic space

9. Complete the text:

A proof-of-concept structure, including a control group, consists of , procedures, findings, and .

10. Which of the following are cold dark matter gamma rays?

expected signal comparable to background
annihilation radiation
a pronounced cosmic-ray halo
difficult to separate from a dark halo
dwarf spheroidals
weakly interacting massless particles

11. Complete the text:

The (CIB) causes a significant attenuation for very high energy through Compton , and electron-positron pair production.

12. Which of the following are likely associated with a green emission line control group?

rocky objects
high peak to background
plasma objects
a G2V photosphere
watery surface

13. With respect to electromagnetic radiation, which of the following are types of backgrounds?

cosmic optical background (COB)
cosmic dust
cosmic ultraviolet background (CUVB)
cosmic X-ray background (CXB)
cosmic cyanogen background (CCB)
cosmic infrared background (CIB)
rocky objects
diffuse extragalactic background radiation
extragalactic background light (EBL)
meson background
cosmic gamma-ray background (CGB)
cosmic radio background


Main source: Hypotheses
  1. Sometimes the apparent background is actually the signal.

See also[edit]

External links[edit]