Object name: NGC7457

Designation(s): NGC7457,

NGC 7457 is a galaxy in Pegasus about 9 degrees north-northeast of the northwest star (Beta Pegasi) of the Great Square. My reason for taking it was it was an entry in the second Herschel 400 program. It was bright enough to get through the smoke so I took it through the dust. It is classified as SA(rs)0-? by NED. Seligman classifies it as E/SA0(rs)?. I don\'t see the ring but when I accidentally loaded the fits into PhotoShop in 8-bit mode one showed up but was dark, not bright. The POSS 11 blue image shows the same dark ring but I was unable to see it in my blue data no matter what I did. Also, it doesn\'t show in their POSS 1 blue image. Nor do I see this dark ring in the SDSS image no matter which color I used. Did the POSS image use 8-bit scanning or at some step in digitizing the POSS II plate?

The field is not well studied so I wasn\'t going to even do an annotated image then I found I\'d picked up three globular clusters in the galaxy. I needed the disk\'s light to help bring them bright enough to see as they are nearly 21st magnitude. Nothing else in the image gets that faint. Others outside the disk couldn\'t be seen in the original FITS stack. You may need to blow up the image several times to see them. They were found in a Hubble image. My attempt to pull them out of the HST data failed so even the HST had trouble seeing them so I don\'t feel bad about it. https://arxiv.org/abs/0804.4472

Another feature of this galaxy is how strongly stars are compressed towards its core. Yet the HST can\'t see the very core as it is packed so tightly with stars. It may not even have a massive black hole or if it does it can\'t be any larger than ours. The stars are packed only a small fraction of a light-year apart, some 30,000 times as dense as the area around our sun. The HST studied it because it was \"normal\" in every way. They found out that wasn\'t the case after all.
HST link http://hubblesite.org/news_release/news/1990-08
More at StarDate: http://blackholes.stardate.org/objects/factsheet-NGC-7457.html

Also, the spindle galaxy, UGC 12311, to the northeast turned out interesting as it harbors many small star clouds in its ansae. They look like small faint stars in our galaxy but they are listed in a couple places as star clusters in it. While at a somewhat similar redshift distance I found nothing indicating the two are related. The non-redshift distance to NGC 7457 is likely more correct. Several sources indicate a similar distance though none agree, all are in the 40 million light-year distance range. I found no such estimates for UGC 12311. Its redshift is likely not all that accurate of a distance measurement but if related to NGC 7457 I\'d expect closer redshift agreement as they\'d be still moving together if related.



http://www.mantrapskies.com/image-archive/NGC/NGC7457/NGC7457L4X10RGB2X10.JPG
http://www.mantrapskies.com/image-archive/NGC/NGC7457/NGC7457L4X10RGB2X10CROP125.JPG
http://www.mantrapskies.com/image-archive/NGC/NGC7457/NGC7457L4X10RGB2X10ID.JPG


Rick