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).
This image was obtained in May, 2010, using the Wide Field Camera 3 on the NASA/ESA Hubble Space Telescope.
Image credit: NASA/STScI; S. Allam and team; and the Master Lens Database, L. A. Moustakas, K. Stewart, et al (2014)
Note: For more information, see Well-Behaved, Young Galaxy Surprises Astronomers and Herschel Discovers Mature Galaxies in the Young Universe.