M–sigma relation

High school (ages 12+)
Space & Astronomy

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/m-sigma-relation

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary theoretical explanation?Co-evolution driven by AGN feedback, regulating galaxy growth and star formation
2. What is the observational method?Spectroscopic measurement of stellar velocity dispersion in galactic bulges
3. What is the M‑sigma relation?The M‑sigma relation is a special link that shows how the speed of stars in a galaxy’s center (called velocity dispersion, sigma) is related to the mass of the big black hole in the middle (mass, M). It looks like a power‑law: M grows roughly with sigma to the 4th or 5th power.
4. Why do black holes and galaxies have a connection?It shows that black holes and their galaxies grow together. When a galaxy’s stars move faster, the black hole is usually bigger, meaning the two influence each other over time.

Stellar Velocity Dispersion: A statistical measure of the range of velocities of stars within a galaxy's bulge, reflecting its gravitational potential.
AGN Feedback: The process by which energy and momentum from an AGN influence the surrounding interstellar medium and galaxy evolution.