Jump to content

sgl_imaging_challenge_2021_annual.thumb.jpg.3fc34f695a81b16210333189a3162ac7.jpg

A rarely imaged galaxy group NGC6928 & Co


Recommended Posts

I have now started chasing data from the Liverpool Telescope of rarely imaged galaxies.

Here is RGB data of a group of such rarely imaged galaxies and this is possibly by far the best image of them posted. The few images of them I have found on the net are quite fuzzy. Searching for them on Astrobin gave me no hits. I have found numbers for four of the galaxies but there are at least two more there. Could NGC6930 be two colliding galaxies?

Filters and exposures:
sdss-r 22 x 90 s (red channel)
Bessell B 12 x 90 s (blue channel)
Bessell V 14 x 90 s (green channel)

So totally 72 min stacked in Nebulosity 4 and processed in PS CS5

Comments most welcome including numbers of the galaxies I could not identify

Cheers

LT NGC6928 RGB PS5cropSign.jpg

LT NGC6928 RGB PS5 NGCnr.jpg

  • Like 11
Link to post
Share on other sites

Excellent Goran, this is a really good use of the LT data.

I'm still a bit uneasy of images of " normal " targets :grin:

Dave

Edited by Davey-T
Link to post
Share on other sites
3 hours ago, Davey-T said:

Excellent Goran, this is a really good use of the LT data.

I'm still a bit uneasy of images of " normal " targets :grin:

Dave

Thanks Dave!

Yes, it is quite rewarding to produce new images of objects in a detail in which they have not been seen before. The problem is just to find them in the LT data base. Very few are in their own little gallery, which is also of poor processing quality (they just seem to be a few crudely stretched subs put together). Wim (@wimvb) and I have been talking about offering all the LT images we have produced by the end of the summer (when imaging becomes possible in Sweden again) to the LT telescope site for a gallery.

Link to post
Share on other sites

Very nice processing Goran and great to see new objects, thanks for sharing.  My setup is not really suited to these "small" galaxies and "little" fuzzies but I love looking at them and thinking about who might be looking back :)

I was intrigued by your unidentified object and went looking ... I searched Simbad and VizieR and like you I could not find any object at that location that is clearly identified as a galaxy.

........

The little I did find ...

Aladin has this object at: ( J2000 ) 20 32 52.223 +09 54 08.44

(Ref http://aladin.u-strasbg.fr/AladinLite/?target=20 32 52.223%2B09 54 08.44&fov=0.07&survey=P%2FDSS2%2Fcolor )

DSS2 imgage:

IMG_0739.PNG.660c2b3ba3e7e96e87ee27ddfbe0e301.PNG

 

Interestingly it does not show up in the 2MASS infrared ( whereas the other galaxies do (?) )

 

IMG_0740.PNG.da0d0c2f0634c32ba104c5600af831da.PNG

 

I did find records of an object at that location in a number of catalog tables ( object type not indicated ).  A couple of which are:

PPMXL: 

IMG_0741.PNG.0e67dcf240d8ae921684bf5ecf8a9afb.PNG

( ref: http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5920cb5c23a3&-out.add=.&-source=I/317/sample&PPMXL===5578560965634059186 )

and GSC 2.3.2:

IMG_0742.PNG.dce18216dccb8e7851606726f2f01c22.PNG

( ref: http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5920cfba3b51&-out.add=.&-source=I/305/out&GSC2.3===N2LD014578 )

Further down the GSC 2.3 entry the eccentricity is stated as 0.31, so not a round guide star then :)

 

Link to post
Share on other sites

Oh, and at the risk of highjacking your post ( sorry ) ...

According to Simbad, the object adjacent to NGC 6930 is

IMG_0745.PNG.70e6b26eb5f2f4f86517fc6ab75a1427.PNG

( ref: http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402726094&Name=2MFGC 15598&submit=submit )

And I think the unidentified object in the top left of your image is :

IMG_0746.PNG.7fe4cad9b2c82d8e29e5e8deb3082ff5.PNG

( ref: http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%405449376&Name=LEDA 214749&submit=submit )

 

  • Like 1
Link to post
Share on other sites
40 minutes ago, mike005 said:

:)

 

Yes Mike, great detective work!

So here is the image with your updated designations and only one question mark remaining.

Did anyone else notice that the yellowish galactic centre of NGC6928 appears to be pouring out. Maybe I should turn the image before it is too late for those living there.... :icon_biggrin:

LT NGC6928 RGB PS5 NGCnr2.jpg

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.