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Thread: M20 ,the Trifid Nebula colors

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    Question M20 ,the Trifid Nebula colors



    Hello,

    I took an image for M20 (the Trifid Nebula) - attached..
    I noticed that the nebula has a creamy look.. especially in the red part.
    first, I thought I have something wrong in my processing workflow.. but I have reviewed some of this nebula images in the web.. they are all have this soft colors paintings ( give feelings of 2D not 3D ) ..
    Any scientific explanation please ?

    Thanks
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    Skywatcher Refractor ED100, Orion Refractor 80mm,Orion Atlas EQ-G mount, Lacerta standalone auto guider, Modified dslr Canon 700d, Astronomik CLS filter..

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    Default Re: M20 ,the Trifid Nebula colors

    First if all the nebula itself is much smoother than it appears in your image. The dark lanes that cross the pink creamy region are all foreground dark clouds obscuring the pink creaminess behind it.

    Also the degree of creaminess depends on your imaging setup and how capable it is at rendering low contrast details.

    Here is an image that shows a lot more internal contrast resolution
    http://www.cosmotography.com/images/...pha_region.jpg

    If you look at this image you'll notice that the center of the nebula is less saturated kind of hollowed out. That doesn't show up in your image.

    The basic physics is that of the Stromgren Sphere
    https://en.wikipedia.org/wiki/Strömgren_sphere

    Differences in intensity reflect differences in density. Sometimes you have to take into account seeing dark clouds backlit against a bright cloud.

    Another example is the NA and Pelican nebulas. They are, if I remember right, one nebula. The dark between them is a dark cloud in from that hides that they are really one object.
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    Default Re: M20 ,the Trifid Nebula colors

    Quote Originally Posted by not_Fritz_Argelander View Post
    First if all the nebula itself is much smoother than it appears in your image. The dark lanes that cross the pink creamy region are all foreground dark clouds obscuring the pink creaminess behind it.

    Also the degree of creaminess depends on your imaging setup and how capable it is at rendering low contrast details.

    Here is an image that shows a lot more internal contrast resolution
    http://www.cosmotography.com/images/...pha_region.jpg

    If you look at this image you'll notice that the center of the nebula is less saturated kind of hollowed out. That doesn't show up in your image.

    The basic physics is that of the Stromgren Sphere
    https://en.wikipedia.org/wiki/Strömgren_sphere

    Differences in intensity reflect differences in density. Sometimes you have to take into account seeing dark clouds backlit against a bright cloud.

    Another example is the NA and Pelican nebulas. They are, if I remember right, one nebula. The dark between them is a dark cloud in from that hides that they are really one object.
    Wow. I just caught this thread. I had to comment a Thank you nFA. That was very interesting information regarding these nebula. Thank you Sir.
    Mark

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    >)))))*> Laniakea

 

 

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