View Full Version : NGC 7497 in the dust

2011-Sep-12, 03:17 AM
NGC 7497 is a galaxy about 60 million light years distant set in the Integrated Flux Nebula in Pegasus. The IFN, also known as Galactic Cirrus is dust far out of the plane of our galaxy caused to fluoresce by the ultraviolet light of super hot stars in our galaxy's disk. The galaxy, of course lies some 60 million light years beyond our galaxy and its IFN. It is classed by the NGC project as an Sc galaxy, as an SB(s)c galaxy by de Vaucoulers and as SB(s)d by NED. I'm not seeing it as a barred spiral though it appears I'm out voted.

The bright blue piece of IFN at the far upper left below a very bright star seems bright enough to have made it into a catalog but Simbad has nothing at that position.

There is little on this field. The blue oval smudge of a galaxy southeast of NGC 7497 is NPM1G +17.0731. The blue smudge west southwest of NGC 7497 is MCG +03-59-001/PGC 070552. The bright blue spiral northeast of NGC 7497 is another bright but anonymous galaxy in NED. I keep running into these. Seems no one it catalogs has found it interesting enough to even list as an anonymous galaxy. It's bottom half seems cut off. Look closely and you see a faint arm down in the "cut off" region. Is it obscured by unlit galactic dust? What is going on here?

Only 4 other galaxies in my image are listed in NED. All small and insignificant, at least from my point of view. I see no difference in them than many others not listed. All 4 are from the 2 micron survey so interesting as bright at that wavelength as likely star factories.

This image was taken over two nights. An asteroid from each night shows in the image. The one from the first night, (247103) 2000 SL317 is NE of NGC 7497, two thirds of the way to the anonymous blue spiral and is moving only in R.A. It was just out of the frame to the west the second night. The other asteroid, 2010 JH161, is about 3.6 minutes west (right) of the core of NGC 7497 and moving down at to the right at a 45 degree angle. It's trail starts near a slightly orange star. It was out of frame to the upper left the first night Comparing the two trails you can tell seeing was a bit better the second night. Both are about 19.5 magnitude.

A blue star at the bottom of the image and a red one at the top hit right on the edge of the chip. When I moved either way to avoid this something put a horrid set of reflections into the image. Only solution was to leave these stars right on the edge where they glared into the image. I could have cloned them out but the blue one was in the IFN and impossible to clone out without distorting the IFN so I decided to leave both in. I did tone them down significantly. Yes they were far worse! I discovered the reflection issue a year after I'd taken it and was just now putting it together. No way to remove it as it hit in the IFN. So I completely redid the image September 3 and 5 of this year. Finally I'm posting a current image.

To see the image full size right click and select View Image. You may need to enlarge the image further depending on your screen resolution. Image is reduced due to band width limits. Full image is at:

14" LX200R @ f/10, L=8x10' RGB=2x10'x3, STL-11000XM, Paramount ME


2011-Sep-18, 07:57 PM
Several have questioned me on other forums if this is IFN or a much closer molecular cloud lit by nearby stars rather than the integrated flux of our galaxy itself thus qualifying as IFN. I received this today from Sakib Rasool.

"The dust around it is part of a high latitude molecular cloud called MBM 54, more or less integrated flux.

"The MBM catalogue is a listing of 57 high latitude translucent clouds published in 1985 by Loris Magnani, Leo Blitz and Lee Mundy.

"I have attached a pseudo colour DSS image of MBM 54."

His image is too large for here. I've posted it to:

I had to reduce my image to fit it within band limits. The full image is now at:


2011-Sep-18, 09:42 PM

That's a stunning image. Great dust, great galaxy.