Object name: NGC7519

Designation(s): NGC7519,

NGC 7519 appears to be a mostly red and dead galaxy in Pegasus below the Great Square. It is about 460 million light-years distant. Its classification varies depending on who you read and even then can vary. NED has it as Sb:, Sb?, and simply as Spiral. Seligman sees it as SBc. So is the arm structure that of a \"b\" or \"c\" galaxy? The latter means the arms are more spread out. And does it have a bar or doesn\'t it. Makes you wonder if they are looking at the same object. It was discovered by Albert Marth on October 5, 1864, by Albert Marth.

My main reason for taking this field was the really strange galaxy Markarian 0526. Check out the Markarian galaxies for strange looking galaxies. Not all are as strange as this one but if you are looking for galaxies that aren\'t typical it is full of them. This one is classified as Sc peculiar. I assume that the peculiar label is due to the long north going tidal stream. It appears to curve into a bright object but redshift shows that to be coincidence as the bright orange object is a distant galaxy at over 3.6 billion light-years. I assume the tidal stream and odd shape of the disk of MRK 0526 are due to either an interaction with some passing galaxy or due to something it is digesting having eaten it several hundred million years ago. The field is poorly studied. I find nothing near its distance of 280 million light-years in the field. But many in the areas don\'t have redshift data available. Still, I favor the plume being due to something it ate possibly being the stars pulled from its meal as it fell into the galaxy. While we can look back in time with a telescope we can\'t make a time-lapse movie except in computer simulations. I\'d love to see such a real (not computer generated guesstimate) time-lapse movie of the history of galaxies like this one.

North and a bit east of NGC 7519 are a pair of distant objects, 6.4 and 8.9 billion light-years distant by their redshift. Both are listed as galaxies with AGN cores. But for me to see them this easily (This image is dimmed severely by smoke) I have to wonder if they are really quasars or if the redshift values are in error. They are given to only 3 digits after the decimal point. NED doesn\'t confirm these to be spectroscopic redshifts. They may be photographic which are less reliable. Usually, spectroscopic redshifts show more significant digits.

As mentioned this field is poorly studied. I\'ve listed all galaxies that redshift values in NED. Several other galaxies without redshift data are identified as well if they had catalog names other than simply their coordinates. Even those with redshift values often had only positional names.

Two asteroids are in the image. The fainter one shows a trail that gets brighter at the western end. This is most likely due to smoke getting less dense. It was coming in clouds that could drift through a field in only a few minutes. While not guiding I do monitor a star with the guide camera for focus. My cloud sensor saw no hint of clouds but the brightness of the monitored star was changing several magnitudes, often only in a minute\'s time due to various levels of smoke I was imaging through. Because of the smoke, I say NGC 7519 appears to be red and dead. It may be bluer than I show if I haven\'t fully compensated for the loss of blue and green to the smoke. I couldn\'t find but a couple color images of this galaxy. One made from DSS red and blue images showed it vivid blue while the SDSS image (not true color but often close) shows it a different red color than I do. But SDSS uses three IR frequencies for red, red is assigned green, green is assigned blue and blue uses two Uv bands making it sometimes hard to interpret. Usually, this makes red and dead galaxies very red due to all the red stars and their IR emission. I need to revisit this without the smoke I suppose. Though it likely won\'t happen with all the objects still on the to-do list.

14\" LX200R f/10, L=4x10\' RB=2x10\' G=1x10\', STL-11000XM, Paramount ME

Rick


http://www.mantrapskies.com/image-archive/NGC/NGC7519/NGC7519L4X10RB2X10G1X10CROP125.JPG
http://www.mantrapskies.com/image-archive/NGC/NGC7519/NGC7519L4X10RB2X10G1X10.JPG
http://www.mantrapskies.com/image-archive/NGC/NGC7519/NGC7519L4X10RB2X10G1X10ID.JPG