Retrieving "Cold Gas" from the archives
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Dwarf Galaxies
Linked via "cold gas"
Dwarf Spheroidals (dSph): These are generally the most dark matter-dominated systems, exhibiting smooth, nearly featureless light profiles. They lack significant ongoing star formation and show evidence of ancient stellar populations. Examples include the classical satellites of the Milky Way, such as Sagittarius Dwarf Spheroidal (Sgr dSph). Their structure often suggests they are the remnants of stripped, larger stellar systems [4].
Dwarf Ellipticals (dE): Lar… -
Dwarf Galaxies
Linked via "cold gas"
Satellite Accretion: The majority of observed dwarfs are satellites orbiting major galaxies. These undergo continuous interaction, leading to:
* Tidal Heating: Gradual distortion of the stellar orbits.
* Ram Pressure Stripping: Removal of cold gas by friction as the dwarf moves through the hot intracluster medium (ICM) or the host galaxy's circumgalactic medium (CGM). This process quenches [star formation](/entries… -
Quasars
Linked via "cold gas"
Quasar Abundance
The space density of quasars appears to have peaked roughly $2.5$ to $3.5$ billion years after the Big Bang (corresponding to redshifts $z \approx 2$ to $3$). Since that epoch, the number density has declined sharply, suggesting that the conditions necessary for fueling such massive accretion events (e.g., abundant cold gas reserves, frequent galaxy mergers) became less common in the later universe. This decline is often modeled using a pure density evolution function that incorp…