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NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle
NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle

NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery

Getting plate-solving status, please wait...
NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle
NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle

NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery

Equipment

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Acquisition details

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Description

When I entered processing this data, I thought that it would be just a simple revision, I would post it, and fully expected to "not" send out revision alerts to the community.  But things got away from me and I learned a whole lot more about this field and the processing in the exercise!  So here  I am posting a completely new post, with old data since it really does not resemble the original at all, and I have a whole lot more to say about this object and the field it sits in than I did in the 2020 post, which I intend to delete.

Even before processing the newly stacked image, I noticed something that showed up that I had missed in my first processing of the data and I have missed in almost every image I have seen of the Veil.  It appeared clear that the density of stars just above the Western Veil segment were diminished at least half as prominent as the rest of the image below this arc of shock wave.  In fact, in my final image of this, the difference in the star density is also not that apparent.  So I include Revision F, a STF version of the 120 sec stack, unprocessed, which shows it better.  Granted, most who image this are not that interested in the starfield.  As such, most process this to heavily reduce the stars (I did then and even now) and to enhance the more gaudy parts of the nebula.  Perfectly understandable!  But what I quickly noticed during the early part of the processing was that the area above the Western Veil was gradually revealing an IFN density that was clearly visible.  It occupies roughly the whole upper right corner of the image above NGC 6960 and extends across the top of the image in variable density.  This was my first decent attempt at using the Generalized Hyperbolic Stretch and when I got to that stage of processing, I was able to tease out more and more of the signal from these dim molecular clouds.  Now I had a reason and understanding for the reduced stars seen in this very same region!  The mouse over shows an overlay of the Aladin-derived AKARI FIS wideL dust image.  The resolution of the overlay is pretty low, but it is interesting that most of the features of the IR image actually show up in the dust that my image shows through that region.  I do realize that my new image is not the most exciting version of this field that can be found.  And to be sure the data suffers in both dearth of time and many imaging artifacts that I tended to cause through my poor techniques back in 2020.  But after stretching in a way that I could actually preserve this feature of the field, I also found the benefit that I was able to see a lot more of the fainter features within the shock waves, but also between the more brilliant parts of the nebula.  And in doing so seems to create a better sense of connectedness between these features thereby giving structure and depth.  Even if the finer details of the nebula are still hindered by artifacts.  

Upon trying to learn more about the Veil Nebula and the region it lies within, I was only able to find one reference to the fact that the stars above NGC 6960 were diminished and the reason given was molecular dust.  This was in an article from Sky and Telescope some time ago.  And the image they used in the small blurb in no way illustrated their point.  AKARI FIS certainly shows what is going on.  That these are molecular clouds can be seen in the CO optical band images on Aladin (not shown here).

Also I decided to present a wider field of view of this area from the AKARI FIS data in Revision D in four panels.  It includes a light blue overlay of the visible extent of the Veil, though that fails to show the "breakout" shock wave below the main body of the Veil.  For that I also provide 3 Radio band images of this same field to highlight the structures not seen in visible in VIS or IR.

No way would I be able to get this image if it wasn't for the XTerminator tools and star reduction by Blanshan's method.  And I suspect that GH Stretch also had a lot to do with the result.  But I am so new with that, that I am not sure what I actually did to get it to work, of if I could have done better!  For this image, I did not push the color saturation so much and left the field in a more subdued "feel"  There are more than enough strikingly bright images of this, which may be warranted since I have been able to see the Western Veil through my 5 inch through an eyepiece!

Comments

Revisions

  • Final
    NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle
    Original
  • NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle
    C
  • NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle
    D
  • NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle
    E
  • NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle
    F

C

Title: MouseOver IR Dust Image

Description: See Description for details. IR image showing the faint IFN dust in the area.

Uploaded: ...

D

Title: Discussion Figures with Molecular Dust Images and Radio Band Images

Description: See Discussion.

Uploaded: ...

E

Title: Original "Old" image

Description: Since I will delete the old Post, I wanted to leave this reduced image of the Original image for comparison. Here it is!

Uploaded: ...

F

Title: Full starfield unprocessed stack

Uploaded: ...

Sky plot

Sky plot

Histogram

NGC 6960, The Veil Nebula, Pickering's Triangle and a New Twist on Old Data, with Aladin Imagery, Alan Brunelle