Talk:Stephan's Quintet

Grouping v clustering

Stephan's Quintet and Hickson Compact Group 92 should be two separate articles, one dealing with the actual physical proximity of HCG92, and the other dealing with the visual proximity of the five galaxies. 132.205.15.4 01:09, 17 Sep 2004 (UTC)

Stephan's Quintet was used as an example by Arp of discordant redshifts. He believes redshift can also be a mesurement of age - increasing redshift sometimes indicates increasing youth. In Stephan's quintet, hydrogen emission patches appear the same size in both low and high redshift members. If high redshift member was conventional distance, HII regions should appear 8 times smaller. He therefore belives NGC 7320 is at the same distance as HicksonCompact group 92 and they are indeed Stephan's Quintet.

There is a much bigger redshift discrepancy in Stephan's Quintet than NGC 7320, discovered October 3rd, 2003. There is a high redshift quasar buried in the dusty nucleus of NGC 7319. The nucleus is opaque--nothing shines through it--and yet the redshift of this quasar indicates that it should be billions of light years beyond Stephan's Quintet. More evidence that the quasar is actually within the nucleus of the galaxy: the dust between the quasar and the center of the galaxy is energized and disturbed, with the only apparent cause the quasar itself.

However, on the night of October 2, 2003, a group of astronomers took the spectrum of the ULX in the above Hubble Telescope photo of Stephan's Quintet (the ULX is the tiny bright spot indicated by the arrow). That spectrum showed a redshift that identified the ULX as a high redshift quasar, something that belongs far in the background of a big bang universe, but is right where it belongs in an intrinsic redshift universe. Halton Arp, who has been ostracized for 30 years for criticizing the big bang, said, " ... nothing could convey the excitement of sitting in the Keck10 meter control room and seeing that beautiful z = 2.11 [high redshift] spectrum unfold on the screen." This is the most direct evidence yet that the redshift = distance relationship doesn't work. [And without the redshift = distance relationship, the big bang also fails.] Arp concluded that most, if not all, of the ULX's will turn out to be nearby quasars in the process of being ejected from active galaxies.

—Preceding unsigned comment added by 216.12.57.241 (talk) 4 May 2005 (UTC)

I read about that too. I just edited based on several sites that were up to date. Onejsin 02:57, 10 March 2006 (UTC)

Arp's interpretation is not generally borne out by the recent X-photos. See the Chandra blog linked to in the article's external links section. Elphion (talk) 07:42, 7 March 2010 (UTC)

Red shift discrepancy

The article gives the red shift of the foreground galaxy, NGC 7320, as 790 km/s; but the table lists a much larger value (5985 ± 9) comparable to that of the other members of the group. Also, it's listed as 7320c in the table, without explanation. Elphion (talk) 11:01, 11 September 2009 (UTC)

Answer: NGC 7320 is the foreground galaxy, not part of the Hickson group and so not listed in the table. NGC 7320c, which is in the table, is thought to be part of the association as it has a similar red shift. It is not visible in most of the photos, being off the left edge of the two photos in the article. It is visible in one of the gallery shots. Elphion (talk) 06:53, 7 March 2010 (UTC)

External links modified

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Image from this article to appear as POTD soon

Hello! This is a note to let the editors of this article know that File:Stephan's Quintet Hubble 2009.full denoise.jpg will be appearing as picture of the day on 22 November 2018. You can view and edit the POTD blurb at Template:POTD/2018-11-22. If this article needs any attention or maintenance, it would be preferable if that could be done before its appearance on the Main Page. Thanks  — Amakuru (talk) 13:44, 8 November 2018 (UTC)

Picture of the day

Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group, visible in the constellation Pegasus, was discovered by Édouard Stephan in 1877 at the Marseille Observatory. The brightest member of the visual grouping is the spiral galaxy NGC 7320 that is shown to have extensive H II regions, identified as red blobs, where active star formation is occurring. Stephan's Quintet is the most studied of all the compact galaxy groups.Image: NASA, ESA, and the Hubble SM4 ERO team.

• Other images in the article appears to be oriented 90deg from the first image. Would someone please try to show consistent orientation of images? Thank You. --2600:6C48:7006:200:B056:6066:1296:EF0B (talk) 02:31, 22 November 2018 (UTC)

Conflicting Copy

In the opening paragraph, and in the caption for the POTD, it definitely states that the brightest member is NGC 7320. In the infobox it equally definitely states the same is NGC 7318B. If there's some explanation in terms of nomenclature, it needs to be given. Otherwise, it needs to be corrected, because, as it is, we look pretty sloppy.Toyokuni3 (talk) 04:26, 22 November 2018 (UTC)

Still there, so we still look sloppy. Which is correct (or at least citable)? Jmacwiki (talk) 14:07, 3 October 2020 (UTC)

Edit of picture caption in infobox

In the infobox, there is the beautiful image that was a Picture of the Day. That image has a caption listing 4 NGC catalog numbers. Until today (Aug. 7, 2019), the numbers are described as "left to right." But when I went to the page for the image itself, it gives NGC numbers in clockwise order, which is different from "left to right." So I'm changing the infobox caption to match the more detailed description on the image's page, so the infobox caption now reads "clockwise from upper left." If I get this wrong, please undo my change, or otherwise fix my work. Oaklandguy (talk) 07:28, 7 August 2019 (UTC)

Webb telescope image

FYI, there is a new image of Stephan's Quintet from the Webb Space Telescope here, if anyone is interested. I'm not sure if this is better or more useful than the pic that is currently in the infobox. Maybe there is some updated information on the linked page that is useful for this article. In any case, I am sure the astronomers here are up on the latest research already. ---Steve Quinn (talk) 00:11, 13 July 2022 (UTC)

Not trying to necro this or anything, but looking at the image I don't know if, at the resolutions we can use, it would be much better. I downloaded the full image and it's like 200 megabytes. You can see the individual stars which is kind of cool, but the colors are totally different and tbh I think the hubble one would be better for this article. Chuckstablers (talk) 21:09, 16 November 2023 (UTC)