-
-
- The composite image that is attached is a beautiful picture of two giant galaxy clusters in collision. Called Abell 520 this colliding cluster of billions of stars is 2.4 lightyears from us.
-
- To make a composite image different electromagnetic emissions are detected and assigned a specific color to make them visible to the eyes that are studying them.
-
-------------- The starlight from galaxies is colored orange.
-
--------------- The hot gas is colored a tint of green. This hot gas is the direct evidence that a collision is taking place. The friction of colliding gas and dust rises to enormous temperatures causing infrared radiation.
-
-------------- The blue-colored areas are the location of most of the mass of the clusters. Dark Matter is 80% of this mass. This mass concentration is detected using gravitational lensing. Light from the background passing close to this large mass is bent and focused like a giant magnifying glass. The magnification is far from perfect causing extensive distortion in the images that are behind the cluster in our line of sight. Astronomers can unscramble these distortions and calculate the amount and position of the large mass that created it.
-
- The blend of blue and green color in the center of the image reveals the lump of Dark Matter that is near the Hot Gas. But, there are very few galaxies found in this same area. This result is contrary to what astronomer’s predicted. Most galaxies appeared to have sailed far away from the collision. Dark Matter does not appear to have its predicted effects in holding galaxy formations together.
-
- Dark Matter should be concentrating the galaxies in this one area. Clouds of Hot X-ray emitting gas should collide, slow down, and lag behind the Dark Matter that interacts with gravity but does not interact with the electromagnetic forces. That is the reason it is Dark and can pass right through Ordinary Matter.
-
- Another Galaxy Cluster collision called the Bullet Cluster was recently studied and it followed these predictions very well. What is different in this case? Abell 520 is not behaving in the same way.
-
- There are only 6 known examples to date of high speed galaxy cluster collisions. The Bullet Cluster and Abell 520 are the two that have good calculations for the amount and position of Dark Matter. Astronomers do not understand Dark Matter enough to explain their observations. Why?
-
- Maybe Abell 520 is more complicated with the collisions of three galaxies rather the 2 galaxies?
-
- Maybe, there are galaxies bundled in with the Dark Matter but they are too dim for our telescopes to detect them?
-
- Maybe Dark Matter is sticky and it interacts with itself causing it to slow down during the collision?
-
- We have more to learn. Computer simulations are busy trying new calculations that better match observations. An announcement will be made shortly, stay tuned
-
-------------------------- ------------------------------------------------------------------
RSVP, please reply with a number to rate this review: #1- learned something new. #2 - Didn’t read it. #3- very interesting. #4- Send another review #___ from the index. #5- Keep em coming. #6- I forwarded copies to some friends. #7- Don‘t send me these anymore! #8- I am forwarding you some questions? Index is available with email and with requested reviews at http://jdetrick.blogspot.com/ Please send feedback, corrections, or recommended improvements to: jamesdetrick@comcast.net.
or, use: “Jim Detrick” www.facebook.com, or , www.twitter.com.
707-536-3272, Monday, March 12, 2012
No comments:
Post a Comment