Cosmology and Power Spectrum Mapping Quiz
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Questions and Answers

What is the significance of mapping the power spectrum from clusters?

  • Measuring the temperature fluctuations of the CMB
  • Understanding the evolution of Lyman break galaxies
  • Gaining insights into large-scale structure formation (correct)
  • Investigating the Gunn-Peterson effect
  • What experiment, launched in 2001, provided a much better angular resolution than COBE for measuring CMB temperature fluctuations?

  • Chandra X-ray Observatory
  • Wilkinson Microwave Anisotropy Probe (WMAP) (correct)
  • COBE
  • Hubble Space Telescope
  • What does the lack or weakness of the Gunn-Peterson effect indicate about the Universe?

  • It is in a stage of recombination
  • It consists mostly of Lyman break galaxies
  • It is fully ionized (correct)
  • It is at a neutral stage
  • What was confirmed for the first time due to the launch of the WMAP in 2001?

    <p>COBE measurements</p> Signup and view all the answers

    What key property allowed WMAP to measure the angular fluctuation spectrum with much better accuracy compared to COBE?

    <p>Increased sensitivity</p> Signup and view all the answers

    What additional parameter was measured besides temperature fluctuation spectrum by WMAP?

    <p>Cross correlation of temperature and polarized CMB flux</p> Signup and view all the answers

    What is the main challenge in distinguishing between the spectrum of the Lyα forest towards the QSO 1422+231 and a simulated spectrum?

    <p>They exhibit identical absorption features.</p> Signup and view all the answers

    What role did espionage satellites play in the observation of the first gamma-ray burst (GRB) in 1967?

    <p>They made the first observation of a GRB.</p> Signup and view all the answers

    What can the energy density comparison between cosmic microwave background (CMB) radiation and other radiation components indicate?

    <p>The dominance of CMB in terms of energy content.</p> Signup and view all the answers

    What was claimed based on an analysis of COBE and IRAS data regarding far-infrared (FIR) background radiation?

    <p>Its sources have been resolved into individual components.</p> Signup and view all the answers

    Which type of background radiation can be understood as a superposition of emissions from discrete sources, besides cosmic microwave background (CMB)?

    <p>Cosmic radio background (CRB).</p> Signup and view all the answers

    When was the nature and origin of gamma-ray bursts (GRBs) first observed?

    <p>In 1967.</p> Signup and view all the answers

    What is the formula for the total energy of the system discussed in the text?

    <p>Etot = Ekin + Epot</p> Signup and view all the answers

    In the text, what is the relationship between the spectrum of a quasar and that of an elliptical galaxy?

    <p>The radiation from an elliptical galaxy is concentrated in a narrow range while a quasar's emission spans the full electromagnetic spectrum.</p> Signup and view all the answers

    What does the 'mean' spectrum of a sample of 718 individual QSOs show according to the text?

    <p>It has a better signal-to-noise ratio than individual spectra.</p> Signup and view all the answers

    In the context of Active Galactic Nuclei (AGN), why can't the light from a quasar be interpreted as a superposition of stellar spectra?

    <p>Because the light from quasars is generated by completely different sources and radiation mechanisms.</p> Signup and view all the answers

    What does the spectrum of a quasar demonstrate about its emission, as per the text?

    <p>The emission is concentrated in a narrow range spanning less than two decades in frequency.</p> Signup and view all the answers

    Based on the information provided, what can be concluded about the energy distribution per frequency interval in quasars?

    <p>The energy distribution remains roughly constant per logarithmic frequency interval.</p> Signup and view all the answers

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