Remnant 7:15 hours - Page 2

bluescope · #21 15-01-2009, 06:44 PM

Very fine work Greg ... I don't know why you bothered buying that big refractor when you get such wonderful images from the BRC

atalas · #22 15-01-2009, 07:24 PM

Love It Greg ! top work dude.

avandonk · #23 15-01-2009, 08:03 PM

Beautiful image Greg. Below is your image superimposed on one of mine a stack taken with the 300mm lens at f/2.8 and 1600 ISO for twenty minutes and HA filter. The FOV of the lens is 7.0x4.7 degrees so that makes your image about 96' square or 1.6 degrees. I have also put up a rough HA mosaic I did sometime ago to get an idea of how faint this stuff is. As you can see there is a lot of this faint stuff in this region.

As you can see the HA is VERY faint in the area covered by Gregs image which makes it all the more remarkable.

Bert

AlexN · #24 15-01-2009, 08:13 PM

My jaw dropped so fast that I lost teeth due to velocity... And shattered my mandible on impact with the ground...

Astonishing image Greg... When's the TEC180FL come out for a play!

Bloodbean (Troy) · #25 15-01-2009, 08:17 PM

Incredible to look at! Well done Greg.

Troy

browndog (Ian) · #26 15-01-2009, 08:55 PM

WOW

Simply fantastic.

spearo (Frank) · #27 15-01-2009, 09:31 PM

missed this one
what a stunner!
frank

Hagar (Doug) · #28 15-01-2009, 11:14 PM

Very Nice Greg this scope camera combination is working very nicely. Look forward to seeing some more.

gregbradley · #29 15-01-2009, 11:26 PM

Quote:

Originally Posted by avandonk

Beautiful image Greg. Below is your image superimposed on one of mine a stack taken with the 300mm lens at f/2.8 and 1600 ISO for twenty minutes and HA filter. The FOV of the lens is 7.0x4.7 degrees so that makes your image about 96' square or 1.6 degrees. I have also put up a rough HA mosaic I did sometime ago to get an idea of how faint this stuff is. As you can see there is a lot of this faint stuff in this region.

As you can see the HA is VERY faint in the area covered by Gregs image which makes it all the more remarkable.

Bert

Thanks Bert,

That is handy doing that overlay to get the correct perspective of the image. So my shot isn't showing the epicentre of the explosion but one of the secondary explosions?? It sure looks like a complete explosion but I suppose these Novas may have multiple explosions connected with them?

Greg.

gregbradley · #30 15-01-2009, 11:35 PM

Quote:

Originally Posted by AlexN

My jaw dropped so fast that I lost teeth due to velocity... And shattered my mandible on impact with the ground...

Astonishing image Greg... When's the TEC180FL come out for a play!

Tonight actually!

I am at my dark site now but there is a bit of cloud around. All ready to press the start imaging button.

Greg.

strongmanmike (Michael) · #31 15-01-2009, 11:36 PM

Quote:

Originally Posted by gregbradley

Tonight actually!

I am at my dark site now but there is a bit of cloud around. All ready to press the start imaging button.

Greg.

Oooooh drum roll

Mike

gregbradley · #32 15-01-2009, 11:37 PM

Thanks very much for the compliments.

I will post a larger version when I get back and links to last years FSQ shots.

Cheers,

Greg.

avandonk · #33 16-01-2009, 10:17 AM

Greg I had a bit of a hunt round and found the coords of the Vela Pulsar. Below is a map centered on it with the images. I have also put a + about where the Velar Pulsar is. I would assume this nails the center of the Vela SNR. There is so much nebulosity in this region not associated with the Vela SNR which confuses any cursory observation.

This is a useful page also
http://fuse.pha.jhu.edu/~wpb/hstvela/hstvela.html

This is why I mainly do widefields to get into perspective and context the beautiful detailed images done with really high end long focal length optics.

I have learned a lot just from this simple exercise. I hope to do a mosaic of this area with the 300mm lens in colour and HA&O3. This was the main reason for building the fridge that cools my Canon 5DH.

Bert

gregbradley · #34 18-01-2009, 12:54 PM

Thanks Bert. Sorry for the slow response I am at my dark site.

That is very interesting. It seems to show there must be multiple explosions rather than just one big one which makes sense when such a large object explodes. Some of those tendrils form a near perfect sphere.

Widefield lens imaging is great and I like your images and what you have done with your 5DH. Very innovative.

Greg.

renormalised (Carl) · #35 18-01-2009, 01:16 PM

Quote:

Originally Posted by gregbradley

Thanks Bert. Sorry for the slow response I am at my dark site.

That is very interesting. It seems to show there must be multiple explosions rather than just one big one which makes sense when such a large object explodes. Some of those tendrils form a near perfect sphere.

Widefield lens imaging is great and I like your images and what you have done with your 5DH. Very innovative.

Greg.

Actually Greg, what you have is only the one explosion at the centre of the object....the original supernova. What all the bubbles, tendrils and such form from is the way the shockwave from the explosion is interacting with the surrounding gases. These gases come from both the original star (from its pre-supernova outflows) and from gases that surrounded the star that were present before the star existed (the nebula it sat in). What causes these gases to fluoresce is the shockwave piling the gases up and heating them. When you have gases that come from stellar winds and such, that created shock disturbances themselves in the surrounding gases being impinged upon by the supernova shockwave, you get all sorts of complicated interactions.

There is also the geometry of the explosion to consider, both in the way the shockwave rips through the star's body as it explodes and in the symmetry of the general explosion. The shockwave which rips through the star isn't normally a nice neat spherical shock front. In actual fact, it's extremely turbulent and more like a boiling mass of hot gas than some neat blast wave like you see in a classic explosion (like you see in pictures of detonating nukes). Then depending on the how the initial shock is generated in the core, the shape of the core, it's rate of rotation and quite a few other factors, the explosion might not occur in all directions simultaneously. You could get a lopsided explosion, say, out one side of the star, so most of the explosive force is directed away from one side. It could go in any direction!!.

So, you see, a supernova explosion is more complicated than you think

gregbradley · #36 18-01-2009, 06:24 PM

Very interersting explanation - thanks.

What we are taking images of is raw chaos in one form or another.

Greg.

gregbradley · #37 20-01-2009, 06:53 PM

Here is the link to a large file version of this image:

http://www.pbase.com/gregbradley/ima...42367/original

Greg.

renormalised (Carl) · #38 20-01-2009, 07:21 PM

You know what would be really interesting, if someone with a small radio telescope could get the timing pulses of the central neutron star so you could include them with the piccie...or even a radio map of the neb. It would show the pulsar up, if it's not radio quiet and that would be interesting to overlay the radio map on the visible image.

gregbradley · #39 20-01-2009, 09:15 PM

Quote:

Originally Posted by renormalised

You know what would be really interesting, if someone with a small radio telescope could get the timing pulses of the central neutron star so you could include them with the piccie...or even a radio map of the neb. It would show the pulsar up, if it's not radio quiet and that would be interesting to overlay the radio map on the visible image.

Yes that would be interesting.

Greg.

strongmanmike (Michael) · #40 20-01-2009, 09:42 PM

Looks great a bit bigger

Have to say, that's a unique processing effort I recon Greg, well done!

Mike