What is the long IR line that cuts diagonally between the radio signals?
Welcome to RGZ, HannaViolet 😃
It's what we call a diffraction spike, a kind of #artifact produced by light (or IR in this case) bouncing off the vanes which support a mirror in the WISE telescope. The same thing happens for SDSS, and you can see the star in this zoomed out view (the spike is in a different direction because the telescopes were pointing differently):
Hope this helps, and happy hunting! 😃