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  1. Baryonic Matter Density

    Linked via "Warm-Hot Intergalactic Medium (WHIM)"

    Warm-Hot Intergalactic Medium (WHIM)
    The primary reservoir for the missing baryons is hypothesized to be the Warm-Hot Intergalactic Medium (WHIM). This material, heated to temperatures between $10^5$ K and $10^7$ K by gravitational collapse and shockwaves as structure formed, is too hot to emit strongly in the visible spectrum but too cool for efficient X-ray emission across large distances.
    Detection relies on [absorption line spectroscopy](/entries/absorption-line-…

  2. Baryonic Matter Density

    Linked via "WHIM"

    The primary reservoir for the missing baryons is hypothesized to be the Warm-Hot Intergalactic Medium (WHIM). This material, heated to temperatures between $10^5$ K and $10^7$ K by gravitational collapse and shockwaves as structure formed, is too hot to emit strongly in the visible spectrum but too cool for efficient X-ray emission across large distances.
    Detection relies on absorption line spectroscopy against bright background […

  3. Baryonic Matter Density

    Linked via "Warm-Hot Intergalactic Medium (WHIM)"

    | 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 ($\text{OVI}$) |
    | Cosmic Sludge ($\Omega_{bs}$) | $\sim 0.002$ | Va…

  4. Baryonic Matter Density

    Linked via "WHIM"

    Early estimates of $\Omegab$ in the 1980s, based solely on galactic rotation curves (which measured total mass), incorrectly assumed that all matter was baryonic, leading to density estimates up to $\OmegaM$ (total matter density) $\approx 1.0$. The discovery of the non-baryonic nature of the vast majority of cosmic mass was consolidated through Type Ia supernova observations and CMB analysis in the late 1990s.
    Future efforts…