English Dictionary

ultra-diffuse

adj

Extremely diffuse. / (astronomy) Specifically, designating a type of galaxy with a very low proportion of visible stars compared to the Milky Way, and hence a very low luminosity.

The ultra-diffuse galaxy is difficult to observe due to its low surface brightness.

意味（1）

Extremely diffuse.

意味（2）

(astronomy) Specifically, designating a type of galaxy with a very low proportion of visible stars compared to the Milky Way, and hence a very low luminosity.

In the next sections we study the properties of galaxies that satisfy our criteria to be ultra diffuse, and consider the contribution from galaxies in the fore- and background using the CFHTLS fields.