Hemisphere:  Northern  ·  Constellation: Boötes (Boo)
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NGC5754, 



    
        

            astroeyes
NGC5754
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NGC5754

Getting plate-solving status, please wait...
NGC5754, 



    
        

            astroeyes
NGC5754
Powered byPixInsight

NGC5754

Technical card

Imaging telescopes or lenses: Orion Optics UK DX 250

Imaging cameras: Starlight Xpress H9C

Mounts: Vixen GPDX w/ SS2K

Guiding cameras: KWIQ Guider

Software: PixInsight  ·  PHD  ·  Astroart 3  ·  NEAT


Dates:May 26, 2015

Frames: 68x120" (2h 16')

Integration: 2h 16'

Avg. Moon age: 8.07 days

Avg. Moon phase: 57.28%


Basic astrometry details

Astrometry.net job: 654254

RA center: 14h 45' 18"

DEC center: +38° 46' 22"

Orientation: 177.990 degrees

Field radius: 0.228 degrees


Resolution: 1161x887

Locations: Home, Weymouth, Dorset, UK, United Kingdom

Description

This is Arp 297, the ngc 5754 galaxy group in Bootes. Somewhat oddly, Halton Arp labelled it in the 'long filaments' section and comments that it has a 'Companion on arm has long tail extending westwards.'

Now on Arp's original plate, Image C, there is not much sign of a long tail extending westwards, so I was unsure quite what he was refering to. I decided to image the group now it's about as high as it gets around here. There is an interesting paper here: http://iopscience.iop.org/1538-3881/126/3/1257/pdf/1538-3881_126_3_1257.pdf which discusses the system and shows a possible tail extending westward after extensive log mapping - the HST image of the group, shown in this paper with a rather small field, excluding the region containing the tail.

The whole group is faint and small and I had some seeing/resolution problems.

NGC 5752 is mag. 14.1, 5753 is mag. 12.8, 5754 is mag. 14.1 and 5755 is mag. 15.1, all pretty low surface brightness, too. My image shows some structure in the main spiral arms and possibly the faintest trace of the long tail extending westward. I also had a look on SKY-MAP.ORG and found this.

http://server5.sky-map.org/imgcut?survey=SDSS&img_id=all&angle=0.46875&ra=14.75678&de=38.7803&width=800&height=800&projection=tan&interpolation=bicubic&jpeg_quality=0.8&output_type=jpeg

Definitely signs of a very faint long tail, if you stretch the image quite a lot, extending Westwards (right), which just goes to show what a great observer Halton Arp was.

There are some interesting redshifts shown in Fig. 1 of the above paper. 5753 and 5755 show very similar recession velocities of around 9600km/s and 5752 and 5754 have velocities of around 4500km/s. One group is twice as remote as the other? I'd like to find redshift data on the tail but no luck so far.

Comments

Revisions

  • NGC5754, 



    
        

            astroeyes
    Original
  • NGC5754, 



    
        

            astroeyes
    C
  • Final
    NGC5754, 



    
        

            astroeyes
    D

Sky plot

Sky plot

Histogram

NGC5754, 



    
        

            astroeyes