Quote:
Originally Posted by Paul Haese
Urgh, Robert. It took enough time to image my image of this area. At 21 hours I have probably the deepest image of the object with 11 or 12 hours of Ha. Perhaps it might be prudent for a group of us to image the region in Ha and produce a combined survey. I am more than happy to contribute and participate in such a survey.
It goes to show that sometimes when you stubble on something and decide to image it for whatever reason; it may just be of interest to more than yourself.  |
Definitely your image sparked off all this interest in what has been a relatively unimaged part of the Milky Way.
Looking at the widefield Ha images of this area there are some other objects of interest nearby. Like directly above on the 180mm lens shot you can see a brighter area of Ha with a bit of black dust and also diagonally off to the right there is another similar patch that may be worth imaging.
I think a mosaic would be great for this area. But its too late for this year probably or perhaps over 4 nights and 1 panel per night of 2.5 hours is all that is left for this year if you got 4 nights of clear weather.
galaxyman's opinionated commentary :
Despite the use of a gigantic telescope, and perhaps because of the prohibitively large time and money expenditure that would be necessary to undertake the best ever
survey of the Milky Way with a 2.6 meter telescope, VPHAS+ is far from being the ultimate
H-alpha survey of the band of the Milky Way.....
(1)
Firstly, these Large Telescope H-alpha images are not going to be very deep images, though the angular resolution of the images is very good; 1 arcsecond or even better.
A
pparently only 120 second exposures !!!....
In my view, this means that the
survey won't be able to detect very faint nebular structures; It seems to me that even with a 100 inch telescope, such short exposures might not detect faint expanding supershells and faint Supernova Remnants.
Why on Earth use a giant telescope and then make shallow exposures??? (actually, the same criticism could be made about many Hubble Telescope exposures)
So I predict that the deepest
H-alpha survey of the Milky Way is going to be done by an amateur astronomer.
(2)
Another deficiency of the VPHAS+ is that the
survey fields do not stretch very far above the galactic equator (the apparent plane of our galaxy), so highly unusual and interesting structures high above the plane, such as those detected in Greg Bradley's very deep Milky Way exposures, will not be imaged in this
survey.
Many of the
least known and
most interesting gaseous structures in spiral galaxies are well above the principal plane of a galaxy, e.g. gas being ejected from a galaxy and gas falling into a galaxy from its halo. Yet it is precisely these least understood
H-alpha structures that won't be surveyed!
_________________________[/QUOTE]
http://www.pbase.com/gregbradley/image/152449036 Closer up shot of the MW Wolf Nebula is top right corner area showing the broader shell of Ha
http://www.pbase.com/gregbradley/ima...95727/original most of the Milky Way Wolf Nebula is to the left side near the big loop RCW114
so you get oriented where this is overall.
That big loop of Ha is worth a mosaic. It doesn't show up in O111 unfortunately so that limits its beauty for a pretty picture.
Greg.
