Cosmology and Power Spectrum Mapping Quiz

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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?

COBE measurements Signup and view all the answers

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

Increased sensitivity Signup and view all the answers

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

Cross correlation of temperature and polarized CMB flux 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?

They exhibit identical absorption features. Signup and view all the answers

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

They made the first observation of a GRB. Signup and view all the answers

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

The dominance of CMB in terms of energy content. Signup and view all the answers

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

Its sources have been resolved into individual components. 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)?

Cosmic radio background (CRB). Signup and view all the answers

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

In 1967. Signup and view all the answers

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

Etot = Ekin + Epot 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?

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

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

It has a better signal-to-noise ratio than individual spectra. 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?

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

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

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

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

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