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Retrieving "Optical Astronomy" from the archives

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  1. Baryonic Matter Density

    Linked via "Optical Astronomy"

    | Location / State | Estimated Baryon Fraction ($\Omega_b$) | Temperature Range (K) | Primary Detection Method |
    | :--- | :--- | :--- | :--- |
    | Stars & Galaxies | $0.007$ | $3 \times 10^3 - 10^7$ | Optical Astronomy/Radio Astronomy |
    | Hot Intracluster Gas (ICM) | $0.004$ | $> 10^7$ | X-ray Astronomy |
    | Warm-Hot Intergalactic Medium (WHIM) | $0.035$ | $10^5 - 10^7$ | [Absorption Spectroscopy…

  2. Galactic Center

    Linked via "optical astronomy"

    The Extinction Barrier and Observation
    Due to the high column density of molecular gas and dust clouds concentrated in the Milky Way plane, the integrated visual extinction/) ($A_V$) toward the Galactic Center is estimated to exceed $30$ magnitudes [2]. This renders optical astronomy virtually useless for studying the core.
    | Wavelength Regime | Primary Observational Target | Dominant Limitation |