The entire galaxy M51 was imaged using both FIFI-LS and GREAT. The FIFI-LS observations took only 7 hr of observatory (wall-clock) time. The image is shown with a surface brightness scale in units of erg/s/cm2/sr. Read more here.

The data are available publicly available in the archive under project ID 04_0116 for further research.

A SOFIA Survey of [C II] in the Galaxy M51. I. [C II] as a Tracer of Star Formation
J.L.Pineda et al (2018), ApJL, 869, L30

SOFIA [C II] Map of M51

Pineda et al. 2018
star formation
Spiral galaxy
interstellar and intergalactic medium
Emission lines