NGC4725

[Ibbo!]

13 xL 600 s

10 x 600 of RG&B

Toscano 200mm RC qsi 690 cam

 

[ollypenrice]

Lovely. This may well be my favourite galaxy, the one-armed spiral.

It may look a bit blue-heavy on my monitor but, hey-ho, it's lovely.

Olly

[Ibbo!]

1 hour ago, ollypenrice said:

Lovely. This may well be my favourite galaxy, the one-armed spiral.

It may look a bit blue-heavy on my monitor but, hey-ho, it's lovely.

Olly

Thanks Olly.

That might change in the next process as I am trying to get some Ha to add to it.

 

Edit

There is not much Ha so I may abandon that idea.

[ollypenrice]

9 hours ago, Ibbo! said:

Thanks Olly.

That might change in the next process as I am trying to get some Ha to add to it.

 

Edit

There is not much Ha so I may abandon that idea.

Measuring you background sky 'per channel' in Ps gives this result:

Your blue values are almost double the other channels.  This is a check I always perform regularly throughout the processing.

Olly

 

[Ibbo!]

On 27/04/2023 at 08:19, ollypenrice said:

Measuring you background sky 'per channel' in Ps gives this result:

Your blue values are almost double the other channels.  This is a check I always perform regularly throughout the processing.

Olly

 

Thanks for the info and help Olly.

 

New process will hopefully be done over the weekend.

[wimvb]

Very nice.

On 26/04/2023 at 23:23, Ibbo! said:

There is not much Ha so I may abandon that idea.

That's a bit of a surprise. Your image shows hints of small Ha regions. Adding Ha could really give this image another dimension.

[Ibbo!]

2 hours ago, wimvb said:

Very nice.

That's a bit of a surprise. Your image shows hints of small Ha regions. Adding Ha could really give this image another dimension.

I too was surprised, maybe the conditions were worse than I thought.

[ollypenrice]

8 hours ago, wimvb said:

Very nice.

That's a bit of a surprise. Your image shows hints of small Ha regions. Adding Ha could really give this image another dimension.

This is a very odd galaxy, having only one spiral arm and a wide, smooth central bulge.  I'm not too surprised to find that it lacks the 'clumping' needed to trigger star formation, though I think, like you, that there are such scattered regions showing already in the image. If the Density Wave theory is correct I wonder how such waves would propagate in a galaxy with a single, almost circular spiral arm.

Olly

[wimvb]

2 hours ago, ollypenrice said:

This is a very odd galaxy, having only one spiral arm and a wide, smooth central bulge.  I'm not too surprised to find that it lacks the 'clumping' needed to trigger star formation, though I think, like you, that there are such scattered regions showing already in the image. If the Density Wave theory is correct I wonder how such waves would propagate in a galaxy with a single, almost circular spiral arm.

Olly

I imaged the galaxy two years ago, but only  collected 5 hours of data, and without Ha filter. If only we still had astro darkness up here, I would revisit this target. Maybe next year.

[gorann]

I had a quick look at the more recent of the 500+ images there is of this galaxy on Astrobin. Most are only (L)RGB but this one has Ha data and there does not seem to be much Ha in the galaxy:

https://www.astrobin.com/m16gbx/

[Rodd]

I think there is Ha, but it is small patches   Long focal length and aperture are needed to resolve them. One of my favorites too

Edited April 29, 2023 by Rodd

[ollypenrice]

6 hours ago, gorann said:

I had a quick look at the more recent of the 500+ images there is of this galaxy on Astrobin. Most are only (L)RGB but this one has Ha data and there does not seem to be much Ha in the galaxy:

https://www.astrobin.com/m16gbx/

Oof, that really is a good image. Tiny Ha regions, nicely done, but really not fundamentally different from LRGB.

Olly

[wimvb]

This image shows the Ha regions a little better.

https://www.astrobin.com/89774/B/