A 10^9-M⊙ galaxy merges with a 10^10-M⊙ galaxy. If 30 % of their combined mass is lost in the co

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A 10^9-M⊙ galaxy merges with a 10^10-M⊙ galaxy. If 30 % of...

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Key Concepts

Galaxy Merger

A galaxy merger is an astrophysical process where two galaxies, influenced by their mutual gravitational attraction, collide and eventually combine to form a single, larger galaxy. This process can significantly alter the structure and composition of the galaxies involved, often triggering starbursts or active galactic nuclei due to the intermixing of gas and dust.

Mass Loss in Collisions

During a galaxy merger, not all of the mass from the original galaxies is retained in the newly formed system. Some mass can be lost due to tidal stripping, ejection of gas, or energy feedback processes. This mass loss is often expressed as a percentage of the original combined mass, which must be considered when calculating the final mass of the new galaxy.

Percentage Calculations

The calculation of mass after a merger that includes a percentage loss involves first summing the initial masses and then reducing this value by the fraction corresponding to the lost mass. This method is an application of percentage reduction, where the final mass is obtained by multiplying the total initial mass by the remaining fraction (for example, 70% if 30% is lost).

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