Seyfert galaxy

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/seyfert-galaxy

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. Who discovered the Seyfert galaxy?1943
2. What is the classification basis?Spectra revealing high-ionization emission lines and clearly detectable host galaxies
3. What is the central phenomenon?Accretion of matter onto a supermassive black hole
4. What makes a Seyfert galaxy different from other galaxies?Seyfert galaxies have very bright centers that shine with strong emission lines. Unlike quasars, we can still see their spiral host galaxy.
5. How do Seyfert galaxies get their bright light?A supermassive black hole at the center pulls in gas and dust, forming a hot accretion disk. The disk heats up to millions of degrees and emits bright ultraviolet and X‑ray light.

Active Galactic Nucleus (AGN): A compact region at the center of a galaxy that has a much higher luminosity than its host galaxy.
Ionization: The process by which an atom or molecule loses or gains electrons, becoming electrically charged.
Unified Model of AGN: A theoretical framework suggesting that different types of AGN are fundamentally the same object viewed from different angles.