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Saturday, July 18, 2015

An experimental 3D-study of an emission nebula Cederblad 214

This is an experimental test with a 3D-conversion of my astronomical image. Only real elements from the original image are used, there is nothing added but the estimated volumetric information!

NOTE. This is a personal vision about shapes and volumes, based on some scientific data, deduction and an artistic impression.

My original photo of the Cederblad 214
click for a large image

Pillar like formations of Cederblad 214.
A blog post about this photo, with the technical details, can be seen HERE

An animated GIF

Please, let the animation load for a few moments to see smooth movement. ~8,5MB

A flythrough video

This is a looped video, click to start and stop. Original movie is in HD720p resolution.

A study about shapes in the nebula

All pillar like formations are pointing to a source of ionization, the open cluster NGC 7822. There are some more dense areas in a gas, able to resist the radiation pressure from young star cluster. Those dense areas, at tip of the pillars, are also potential places for the formations of the new stars. A radiation pressure (solar wind) from the cluster 7822 is forming a hollow space inside a gas cloud, it can be seen in my 3D-studies too.

Info about the technique used

Due to huge distances, real parallax can't be imaged in most of the astronomical objects.
I have developed an experimental technique to convert my astropics to a artificial volumetric models.

My 3-D experiments are a mixture of science and an artistic impression. I collect distance and other information before I do my 3-D conversion. Usually there are known stars, coursing the ionization, so I can place them at right relative distance. If I know a distance to the nebula, I can fine tune distances of the stars so, that right amount of stars are front and behind of the object.

I use a “rule of thumb” method for stars: brighter is closer, but if a real distance is known, I'm using that. Many 3-D shapes can be figured out just by looking carefully the structures in nebula, such as dark nebulae must be at front of the emission nebulae in order to show up etc...

The general structure of many star forming regions is very same, there is a group of young stars, as an open cluster inside of the nebula. The stellar wind from the stars is then blowing the gas away around the cluster and forming a kind of cavitation – or a hole — around it. The pillar-like formations in the nebula must point to a source of stellar wind, for the same reason.

How accurate the final model is, depends how much I have known and guessed right. The motivation to make those 3-D-studies is just to show, that objects in the images are not like paintings on the canvas but really three dimensional objects floating in the three dimensional space. This generally adds a new dimension to my hobby as an astronomical imager.

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