Hubble has posted a new photo. This time it is NGC 5728, a spiral galaxy 130 million light years from Earth. The image was taken with a Hubble Wide Field Camera 3 (WFC3).
Its peculiarity is that it is very sensitive to visible and infrared light. Thus, this image perfectly captures the regions of NGC 5728, which are not only visible to the “naked” eye, but also emitting infrared light. However, there are many other types of light that are not available with WFC3.
For example, the image does not show that NGC 5728 is also a Seyfert galaxy. The Seyfert galaxy is a spiral or irregular galaxy with an active galactic nuclei (AGN). Its emission spectrum contains many bright broad bands, indicating powerful gas ejections at speeds of up to several thousand kilometers per second. Such galaxies were first described in 1943 by Karl Seyfert.
There are many different types of AGNs, and only a few are the source of energy for Seyfert galaxies. In turn, NGC 5728, like all galaxies of this type, differs from other objects with an active nucleus in that the galaxy itself is clearly visible. That is why the structure of the galaxy is clearly visible in the image: it is a bright central part and spiral arms, twisting counterclockwise.