How does the fifth image form in the Einstein Cross?

“A mysterious fifth image inside a rare Einstein Cross exposed a massive halo of dark matter, giving astronomers a rare chance to study both the distant galaxy and the invisible structures shaping the cosmos. (Artist’s concept.) Credit: SciTechDaily.com” (ScitechDaily, Astronomers Spot “Impossible” Fifth Image Unlocking Dark Matter Secrets)

“The Einstein Cross (Q2237+0305 or QSO 2237+0305) is a gravitationally lensed quasar that sits directly behind the centre of the galaxy ZW 2237+030, called Huchra's Lens. Four images of the same distant quasar (plus one in the centre, too dim to see) appear in the middle of the foreground galaxy due to strong gravitational lensing. This system was discovered by John Huchra and coworkers in 1985, although at the time they only detected that there was a quasar behind a galaxy based on differing redshifts and did not resolve the four separate images of the quasar.” (Wikipedia, Einstein Cross)

The reason why the fifth image is possible. The thing. That is, the gravitational lens is a quasar. This is a straight line just behind the galaxy that the gravitational lens will make those four images. The distance to the galaxy is about 400 million ly. And the distance to that quasar is 8 billion light-years. 

The fifth image formed in Einstein Cross is of a supermassive object. In the middle of the image. Pulls radiation back in  focus. This means there is a galaxy that turns light into the form where radiation forms the four images of the single galaxy. The mass that focuses radiation forming that fifth must be between the galaxy (or in this case, quasar) and the observer. 

“Einstein cross: Four images of the same distant quasar (due to the gravitational lensing of the galaxy closest to us, shown in the foreground, the Huchra Lens).(Wikipedia, Einstein Cross)

“Hubble Space Telescope captures Einstein Cross.” (Wikipedia, Einstein Cross)

“A rare cosmic configuration: An Einstein Cross with five points of light, instead of the usual four, has been discovered by scientists. Credit: P. Cox et al. – ALMA (ESO/NAOJ/NRAO)”  (ScitechDaily, Astronomers Spot “Impossible” Fifth Image Unlocking Dark Matter Secrets)

So, there is an object between the distant galaxy and the Earth. The thing that observers cannot see about the object makes it interesting. Can it be some kind of dark matter formation, or maybe there is some kind of black hole between that distant galaxy and Earth? 

But if there is a supermassive black hole between Earth and that distant galaxy, why can't we see that black hole’s halo or the galaxy that should form around it? Of course, that halo can also be a quasar, but the problem is how the thing that forms the radiation cone can remain unseen? The quasar is behind the galaxy. It is in a straight line to Earth. The galaxy or the object that collects radiation into the fifth image is a straight line between Earth and that distant galaxy. 

There is a possibility that gravitational microlensing can also form the Einstein Cross. The gravitational microlensing. Means a black hole that is in our galaxy that bends light. All black holes act as gravitational lenses. In the case of a black hole, the term means a black hole that is at a certain distance from Earth. The microlensing is similar. But a smaller phenomenon. Than the full-size gravitational lensing. There is a possibility that planets. Or other, less massive objects can also form a gravitational lens. And in the case of planets, white dwarfs, and neutron stars. We can talk about microlensing. The neutron stars and planets with no atmosphere are excellent objects. To observe microlensing. In the cases of the stars. The atmosphere makes it hard to separate the gravitational lensing from the effect that the star’s atmosphere causes. 

https://www.constellation-guide.com/einstein-cross/

https://scitechdaily.com/astronomers-spot-impossible-fifth-image-unlocking-dark-matter-secrets/

https://en.wikipedia.org/wiki/Einstein_Cross

https://en.wikipedia.org/wiki/Huchra%27s_lens