Four Panel Mosaic Vela SNR in NII and OIII

[cosmophoton (Luiz)]

Outstanding work, and amazing level of detail.

[gvanhau (Geert)]

Very Nice one.

How many hours have you spent on it until now?


Geert

[avandonk]

Two panel HP starless 12MB

http://d1355990.i49.quadrahosting.co...R_2P_HP_SL.jpg


Bert

[avandonk]

Originally Posted by strongmanmike

You love that area of sky huh Bert? how many times have you imaged it now? This latest Hubble version panel certainly looks rather good

Mike
who wishes he had an OS RH200

Mike ever since I made a 11x11 degree RGB+NB mosaic of this region with the 5DH many years ago I have wanted to do a better version. The problem is that even the bright bits are very dim.

So far weather has been the main limiting factor. I will collect more data soon when Vela is up in my Eastern sky again.

I have found the more you do something and look at the result critically and then do it again, it only can get better.

Here are the first two panels with stars. 15 MB

http://d1355990.i49.quadrahosting.co...VSNR_2P_HP.jpg


Bert

[avandonk]

A few thoughts


After stacking PI produces a 32 bit FP image. It can produce a 64 bit one.

All further processing was done in 32 bit linear form ie unstretched.

Why is this important?

All the dim nebulousity is in about the bottom 2% of the 16 bit image. This at best is about 1300 levels (0.02x65000) which is 10 or 11 bits.

By stacking many images into a 32 bit floating point image this bottom 2% now has many more levels available. Millions in fact.


When we now apply DBE Dynamic Background Extraction and ATW Atrous Wavelet Transform to this 32b FP data the result is far more mathematically valid.


Without DBE and ATW this very dim data would not even appear, let alone almost noise free.

ATW is the best method I have seen to reduce noise in the dark background without affecting ANY signal.

More on this later.

Bert

[cometcatcher (Kevin)]

That's incredible.

[John Hothersall]

That is just mesmerising, structure is sod detailed.

John.