18 Questions
What is the significance of mapping the power spectrum from clusters?
Gaining insights into large-scale structure formation
What experiment, launched in 2001, provided a much better angular resolution than COBE for measuring CMB temperature fluctuations?
Wilkinson Microwave Anisotropy Probe (WMAP)
What does the lack or weakness of the Gunn-Peterson effect indicate about the Universe?
It is fully ionized
What was confirmed for the first time due to the launch of the WMAP in 2001?
COBE measurements
What key property allowed WMAP to measure the angular fluctuation spectrum with much better accuracy compared to COBE?
Increased sensitivity
What additional parameter was measured besides temperature fluctuation spectrum by WMAP?
Cross correlation of temperature and polarized CMB flux
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.
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.
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.
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.
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).
When was the nature and origin of gamma-ray bursts (GRBs) first observed?
In 1967.
What is the formula for the total energy of the system discussed in the text?
Etot = Ekin + Epot
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.
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.
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.
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.
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.
Test your knowledge on the power spectrum mapping of clusters in cosmology, as discussed in Schuecker et al. 2001. Explore concepts related to the epoch of the Universe, from fully neutral to fully ionized stages, and the role of instruments like the Wilkinson Microwave Anisotropy Probe (WMAP).
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