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NGC 4725/4747 group and planetary nebula LoTr 5 (PK339+88.1), Added Data, Alan Brunelle
NGC 4725/4747 group and planetary nebula LoTr 5 (PK339+88.1), Added Data, Alan Brunelle

NGC 4725/4747 group and planetary nebula LoTr 5 (PK339+88.1), Added Data

Getting plate-solving status, please wait...
NGC 4725/4747 group and planetary nebula LoTr 5 (PK339+88.1), Added Data, Alan Brunelle
NGC 4725/4747 group and planetary nebula LoTr 5 (PK339+88.1), Added Data, Alan Brunelle

NGC 4725/4747 group and planetary nebula LoTr 5 (PK339+88.1), Added Data

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Description

I decided to issue a separate post on this field even though it is essentially identical to my earlier post:

NGC 4725/4747 group and planetary nebula LoTr 5 with OSC

The primary reason for the project was a reprocessing of the original data.  However, I decided that I would add nearly 2 hrs of data that I thought was good enough to include and try to deepen and improve the result.  I certainly am happy with the result, though I am not sure how much had to do with the additional 2hrs of subs and how much had to do with the better methods that I applied to the data.  In any case, this was from scratch.  I wanted to improve the stars and did so.  However, even BXT had a tendency to "fix" many of the smaller galaxies that are scattered about the image in probably the thousands.  Many more of these than stars.  Also, StarXTerminator also failed to distinguish these small smudges from stars, so there was no way to correct star issues alone, by isolating stars from galaxy smudges.  No complaints, my defective star images typically look a bit like fuzzy like these small galaxies.  But for this processing, I could hit this image with a stronger noise reduction than on the earlier image and that helped me to present the overlay for this presentation.  Also, the PN, LoTr 5, "came out" much more readily upon the stretch.  Not wanting to delete the background galactic clusters, I did a minimal amount of star reduction.  But the main subjects in this field were so bright that I did not mind the stars here.  I believe that I achieved a little bit more detail in the brightest galaxies versus the original image.  And certainly better signal on the faint star streams associated with the outer reaches of the two largest galaxies.  The spider webs in my OTA are highlighted in the diffraction spikes of the brightest stars.  These certainly bug me.  I may spend some time on getting rid of these, but I hate painting photos...

I've written more on the field in my earlier post, so I won't repeat myself.  But I will repeat the Description of the Mouse Over image here so it is all in one place:
MouseOver:  Here is a closeup of the area near planetary nebula LoTr 5. In particular, there are several regions of fairly high density galaxy clusters seen in this region. In particular, directly left of the PN are a number of more obvious distant galaxies, highlighted by faint diffuse areas around reddish nuclei. These are surrounded by many more pointlike reddish galaxies as well. In the upper left of the image are two arcs of galaxies that are seen to be reddish in color as well. The images of these galaxies is clearly such that they look point-like for the most part. Unfortunately, BXT deconvolution/star correction did not do these small galaxies any favors. Many were treated as if stars and were circularized. I have the benefit of looking at these with my original stacks prior to doing actions that lost some of the obvious galaxy fuzziness for some of these. In any case, it is clear that there are far more galaxies imaged in this field than there are stars. The dearth of stars can be attributed to the fact that this field of view is almost directly away from the plane of the Milky Way. It is for this reason that this sort of angle of attack was also used by Hubble during its Deep Field imaging.

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  • Final
    NGC 4725/4747 group and planetary nebula LoTr 5 (PK339+88.1), Added Data, Alan Brunelle
    Original
  • NGC 4725/4747 group and planetary nebula LoTr 5 (PK339+88.1), Added Data, Alan Brunelle
    B

B

Title: LoTr 5 Isolated, including galaxy clusters

Description: Here is an closeup of the area near planetary nebula LoTr 5. In particular, there are several regions of fairly high density galaxy clusters seen in this region. In particular, directly left of the PN are a number of more obvious distant galaxies, highlighted by faint diffuse areas around reddish nuclei. These are surrounded by many more pointlike reddish galaxies as well. In the upper left of the image are two arcs of galaxies that are seen to be reddish in color as well. The images of these galaxies is clearly such that they look point-like for the most part. Unfortunately, BXT deconvolution/star correction did not do these small galaxies any favors. Many were treated as if stars and were circularized. So I have the benefit of looking at these with my original stacks prior to doing actions that lost some of the obvious galaxy fuzziness for some of these. In any case, it is clear that there are far more galaxies imaged in this field than there are stars. The dearth of stars can be attributed to the fact that this field of view is almost directly away from the plane of the Milky Way. It is for this reason that this sort of angle of attack was also used by Hubble during its Deep Field imaging.

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NGC 4725/4747 group and planetary nebula LoTr 5 (PK339+88.1), Added Data, Alan Brunelle