Question

What is a galactic wind?

A) a jet of ionized particles shot out of a starburst galaxy
B) hot gas erupting into intergalactic space from a large superbubble
C) the heat (infrared radiation) emitted by dust grains in the large molecular clouds of starburst galaxies
D) the cooler gas pushed out of a starburst galaxy by the intense radiation pressure
E) a wind created by the expansion of the universe that can move galaxies around

Answer 1

A galactic wind is B) hot gas erupting into intergalactic space from a large superbubble, made of rapidly moving particles that can alter star formation processes and affect the interstellar medium.

Step-by-step explanation:

A galactic wind is B) hot gas erupting into intergalactic space from a large superbubble. These winds consist of highly accelerated particles, including protons (hydrogen nuclei) and electrons, which are propelled away from a galaxy at tremendous speeds. When these winds interact with the surrounding interstellar medium, they can significantly affect the distribution of gas and dust.

Furthermore, the phenomenon of 'jets', such as the one observed in the galaxy M87, involves streams of particles like electrons being ejected at nearly the speed of light. The energy and particles from these jets also contribute to the wider concept of galactic winds and influence the interstellar medium.

It's important to note that while these winds and jets can have profound effects on the host galaxy and its immediate environment, they do not influence areas like our Local Bubble because the density and temperature, although extremely high, are not sufficient to affect the stars or planets within it.