Quote:
Originally Posted by madbadgalaxyman
Steven,
Your experiment with NIR imaging is interesting.
Even though I am currently writing an article about the Coalsack, I haven't actually considered the case of RCW 71. (though I have seen this nebula on various images.)
It seems to me that you are right that the nebular emission being mainly output at a few specific spectral lines (mainly OIII and H-alpha) might be a reason for there being little signal at near-infrared wavelengths.
Abell (ACO) 3627, the rich but obscured cluster of galaxies in Triangulum Australe, could be an interesting test object for NIR imaging, as the member galaxies will have plenty of emission at red and infrared wavelengths
(note: I ran a thread recently as to why this cluster is referred to, even by professional astronomers, as the Norma Cluster)
cheers,
Robert
Here are a couple of links relevant to 700nm - 1000nm sensitive CCDs:
http://www-ccd.lbl.gov
http://snap.lbl.gov/ccdweb/ccdpapers.html
(several papers about CCDs with extended infrared sensitivity)
The book "Optics in Astrophysics", (2005), by Foy and Foy, contains a section on how CCDs are optimized for various wavelengths. Some of it is available at Google Books |
Thanks for the links.
I'll check out Abell (ACO) 3627 as I am interested in imaging obscure (that is off the beaten track) objects.
The Circinus galaxy is coming into imaging season, I'll try the NIR filter on this one. I have an LRGB image of this object.
Regards
Steven