Same z galaxies with different colors

[tune490]

Both of these galaxies are at z = 0.93 yet the first one is deeply red and the second is blue-grey. You can tell that we are dealing with a different stellar population if that is the right wording. It could also be that the red galaxy has a lot more dust. But I am not an expert in this area by any means. I am curious though if anyone who comes across this post who is an expert can give me some insight into what is going on here. Much appreaciated

https://www.legacysurvey.org//viewer/?ra=75.2181&dec=-3.5270&layer=ls-dr9&zoom=14

https://www.legacysurvey.org//viewer/?ra=75.2113&dec=-3.5479&layer=ls-dr9&zoom=14

I have also linked the spectrum to compare:

https://www.legacysurvey.org/viewer/desi-spectrum/dr1/targetid39627701446773215

https://www.legacysurvey.org/viewer/desi-spectrum/dr1/targetid39627701446773058

[dstn]

Yep, the red one was targeted as an LRG (luminous red galaxy), the blue one an ELG (emission line galaxy). These (along with quasars) are the major DESI dark-time target classes. The former are massive and red, the latter are lower mass and star forming.
cheers,
dustin

[tune490]

Cool thanks