Hubble and Herschel combine to study the galaxy known as S0901 seen here as a arc. The arc is a result of huge gravitational forces from a galaxy or galaxies between us and the galactic arc, gravity so strong light from the more distant S0901 is actually magnified and bent into an arc.
Fascinating stuff! I do wonder if we will ever be able to sort of reverse engineer the arc into some semblance of the actual hidden galaxy.
The young galaxy SDSS090122.37+181432.3, also known as S0901, is seen here as the bright arc to the left of the central bright galaxy. The distorted view of S0901 is caused by gravitational lensing, resulting from one or more galaxies that lie between the observer and S0901. Although one effect of lensing is to distort the image, another effect is to magnify the light of the lensed object. This effect was used to enable scientists to study S0901 with Herschel’s Heterodyne Instrument for the Far-Infrared (HIFI).