Due to lack of clear nights of late I've been looking again at images taken in the past. On one there is a curious object at RA 11:16:30, Dec -61:30:00 J2000 (i.e. a little to the south-east of NGC 3603) – see crop attached. It's quite bright and so it appears routinely on images of the usual field that contains both NGC3603 and NGC3576. It has an angular measurement of about 2':25” but it would nevertheless seem to be quite large. If it lies at the same distance as NGC3603 it would be about 14 ly across. At the distance of NGC3576 it would be 6 ly. It has an interesting structure that appears to contain two, three or maybe even four loops. It would be interesting to find out what it is but, in an admittedly cursory search, I can't find any mention of it in the various catalogues that I've tried. I wonder if anyone can identify it?
One name is BBW 351. BBW is the Catalogue of Galactic Emission and Reflection Nebulae, by Brand, Blitz and Wouterloot, 1986. It is also in the Revised AFGL Infrared Sky Survey Catalog, Price & Murdock, 1983, as RAFGL 4127. Source: Vizier.
I had spent some time trying to track down that object as well but couldn't find any mention of it!
BBW isn't a catalog that I have heard of before, have to check it out.
Many thanks indeed Rob_K. The image displayed by aladinLite via VizieR does indeed confirm the references that you give. Now with the catalogue references to hand it may be possible to see if there is any description available out there.
