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Observing >> Deep Sky Observing

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Reged: 08/20/05

Loc: London UK
NGC 383 gx chain in Pisces new
      #6191117 - 11/12/13 04:52 PM Attachment (16 downloads)

Despite a bright gibbous moon and drifting cirrus tonight got the shot of NGC 383 and the vertical N/S gxy chain as requested below and annotated version

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"Astronomical Tourist"

Reged: 04/24/04

Loc: Arizona, USA
Re: NGC 383 gx chain in Pisces [Re: nytecam]
      #6191996 - 11/13/13 01:51 AM Attachment (10 downloads)

Howdy folks;

Here is my drawing of this area with a 13 inch Newtonian at 100X, so the field of view is larger, but at this lower power I did not pick out the fainter galaxies. Lots of fun.

Clear skies;
Steve Coe

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super member

Reged: 03/05/12

Loc: 31°51'09" S 24°25'47" E
Re: NGC 383 gx chain in Pisces new [Re: stevecoe]
      #6198279 - 11/16/13 02:35 PM

Thanks to nytecam for posting the NGC 383 and NGC 507 image, and to Steve Coe’s excellent sketch of the 383 (Arp 311) chain. The two images are a study in the difference between what we see and what a CCD sees. They look even more radically different in Alan Bridle’s wonderful shot of 383’s fulminous core and million light year emission jets here. NGC 383 appears as such a hotspot because of a recent interaction with very close by NGC 382, which fed an already ravenous supermassive black hole. The 382-383 interaction also produced a starburst bridge which associated with the type 1a supernova SN2000dk. The Arp 311 group and N383’s jet were well studied in a 1994 paper here and a 2005 paper here.

The Arp 331 group and nearby NGC 507 group nytecam showcased Nov 9. These two groups are a minor part of what Adventures in Deep Space capsules as, ‘One of the largest known structures in the universe is the Perseus - Pisces Supercluster. This huge filament of galaxy clusters extends from the Perseus Cluster (Abell 426) through Abell 347 and Abell 262 in Andromeda into the NGC 507 and NGC 383 galaxy groups in northern Pisces. Even at a distance of 250 million light years, this chain of galaxy clusters extends more than 40 degrees across the winter sky.’

It’s noteworthy that the linear chain we discern in nytecam and Steve’s images is a real gravitational feature. It lies perpendicular to the plane of the filamentary ridge from which the entire Perseus-Pisces Supercluster has formed. See PDF page 5 (p.36) of the 1994 paper above for an informative map of the properties of the chain. Similar linear-weighted alignments occur in the next-door NGC 507 group from IC 1689 to NGC 512, and from CGC 710 to 712 in the further-off Abell 262 group. Michael Vlasov’s ‘Deep Sky Hunter’ atlas (#36) shows at these alignments in charts we can print out for use at the eyepiece. These seemingly contrary perpendicular features originate when large galaxy clusters form in filamentary clumps from cold gas infalling along the plane of an enormous proto-galactic wall. The Perseus-Pisces Supercluster is one such wall, and is one of the two largest in the nearby universe. Cold gas falls in pretty much perpendicular to the gravitational well of the wall itself. That induces chains of galaxy formation in filaments. In larger galaxy clusters like Abell 262 these are smoothed into round shapes as the clusters stabilize gravitationally. Small-mass clusters like NGC 383 don’t have enough gravity to ‘virialize’ themselves—meaning their total outward kinetic energy is less than the total energy acting on them from outside—so they retain the chain-like shape of their primordial formation.

And to think, all this congealed immensity came out of nytecam’s two recent images and Steve Coe’s helpful eyepiece sketch. Kudos to all.

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Bill Weir
Carpal Tunnel

Reged: 06/01/04

Loc: Metchosin (Victoria), Canada
Re: NGC 383 gx chain in Pisces new [Re: WeltevredenKaroo]
      #6199294 - 11/17/13 01:58 AM

This is such a fun galaxy group. A couple of weeks ago I revisited it with my 20" using a chart I printed from Megastar. I don't have my notes at hand but remember it was an even dozen I saw. That number seems to match your annotated image minus the anonymous ones. It has been one of my favs ever since I stumbled upon it several years back with my 12.5".


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