Starship Asterisk*

Darwins wrote:Beautiful picture. Is the part I have circled in yellow the supernova?

neufer wrote:

alter-ego wrote:
I don't understand the role the B-field is that you're implying. The colored layers simply reflect the radial shock-front energy distribution where the atomic oxygen emission reveals that shell as the highest-energy, leading edge of the SN explosion, and hydrogen emission being the cooler emission following the shock wave. I'm not saying that magnetic fields don't exist in those regions, just that they are not needed to explain the emissions visible in the picture. Analogously, the higher-energy, SN1006 APOD shows the same shock-wave phenomenon but in the X-ray regime instead of the visible.

SN1006 APOD is analogous because the blue color is on the outside?

Does blue always go on the outside? [What about rainbows? http://apod.nasa.gov/apod/ap110814.html ]

alter-ego wrote:
I don't understand the role the B-field is that you're implying. The colored layers simply reflect the radial shock-front energy distribution where the atomic oxygen emission reveals that shell as the highest-energy, leading edge of the SN explosion, and hydrogen emission being the cooler emission following the shock wave. I'm not saying that magnetic fields don't exist in those regions, just that they are not needed to explain the emissions visible in the picture. Analogously, the higher-energy, SN1006 APOD shows the same shock-wave phenomenon but in the X-ray regime instead of the visible.

neufer wrote:

[b][color=#FF0000][size=150]Cyclotron with positive ions moving counterclockwise[/size] [size=125]because the magnetic field runs [u]from the top to the bottom[/u].[/size] [Note that the Earth's North Magnetic Pole is actually a magnetic south pole][/color][/b]

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stephen63 wrote:

neufer wrote:
As the different plasmas passed through:

• 1) the remnant dipole field of the exploded star
  2) and/or the residual galactic magnetic field

the atomic hydrogen (red) curved in a counter-clockwise direction more than the doubly ionized oxygen
(about a northerly directed axis).

For us dummies(specifically me),
does that follow the right hand rule?
http://www.magnet.fsu.edu/education/tut ... handrules/

• For all of us, actually.

Meaning that the magnetic field runs from the top to the bottom in: http://apod.nasa.gov/apod/ap121126.html

------------------------------------------------------------------------------------
Note: Red blue glasses actually make the closer components of:
http://apod.nasa.gov/apod/ap121126.html appear to be closer

Beyond wrote:

neufer wrote:
Meaning that the magnetic field
runs from the top to the bottom in: ...

Even in front of a mirror turned sideways

http://www.flickr.com/photos/22611996@N02/6218610907/ wrote:
<<This is my lino-cut portrait of Chien-Shiung Wu, her reflection (as in a mirror) and a schematic of her famous 1956 experiment which showed that unlike anything else, the weak force isn't the same if you reflect the set-up in the mirror (it isn't spatially invariant, it violates parity). She place radioactive Cobalt-60 in a strong magnetic field and showed that the emitted beta decay electrons went preferentially in one direction (shown as down towards the North pole of the electromagnet in the box on the left). When the mirror reflection of the experiment was performed, the emitted electrons go preferentially in the OPPOSITE direction (up towards the North pole of the electromagnet in the right side schematic).>>

neufer wrote:Meaning that the magnetic field runs from the top to the bottom in: ...

stephen63 wrote:

neufer wrote:
As the different plasmas passed through:

• 1) the remnant dipole field of the exploded star
  2) and/or the residual galactic magnetic field

the atomic hydrogen (red) curved in a counter-clockwise direction more than the doubly ionized oxygen
(about a northerly directed axis).

For us dummies(specifically me),
does that follow the right hand rule?
http://www.magnet.fsu.edu/education/tut ... handrules/

• For all of us, actually.

------------------------------------------------------------------------------------
Note: Red blue glasses actually make the closer components of:
http://apod.nasa.gov/apod/ap121126.html appear to be closer

neufer wrote:
As the different plasmas passed through:

• 1) the remnant dipole field of the exploded star
  2) and/or the residual galactic magnetic field

the atomic hydrogen (red) curved in a counter-clockwise direction more than the doubly ionized oxygen
(about a northerly directed axis).

retrogalax wrote:
Are the two layers in the veil caused by
the different atomic masses of the molecules ?

• Yes.

retrogalax wrote:
Why the blue layer is above ?

• 1) the remnant dipole field of the exploded star
  2) and/or the residual galactic magnetic field

Beyond wrote:

neufer wrote:
Why do mirrors switch left & right but not up & down

Mirrors don't switch anything. They merely reflect what is in front of them.

neufer wrote:Why do mirrors switch left & right but not up & down

AvidAmateur wrote:Why would light from a source 1400 light years away require 10,000 years to travel to earth visibility? Should it not require 1400 years?

AvidAmateur wrote:
Why would light from a source 1400 light years away require 10,000 years to travel to earth visibility?

Should it not require 1400 years?

neufer wrote:

jdjensen17 wrote:Why isn't the Western Veil on the left?

The Western Veil is on the right (with North up) because we look up at the sky but down on the Earth such that East & West are reversed.

jdjensen17 wrote:
Why isn't the Western Veil on the left?

Is it labeled from the perspective of where the star used to be?

Boomer12k wrote:

sbraun wrote:I bet the terms "narrow band" and "wide (or broad?) band" have been defined in previous APOD postings, but I'm curious about what these mean--the term "narrow band" being used in this description. I presume it's something like the range of wavelengths to which a CCD or other telescopic collector is "tuned" to capture...or something. Perhaps including a hyperlink--which is so often, and very helpfully, done with postings would be good here--though I understand that after hyperlinking a term 50 times you might assume readers would know it by now! Please know how terrific this site is, and how much I, for one, appreciate all of the work that goes into it. Extraordinary!

Here is a simple explanation...and as you go down the page, you will see why I have not gotten into filters....

The bottom link is to the combined color picture of the filters on M27, one of my favorite objects. It is interesting to note the X pattern in the nebula...I had not noticed that before. Filters can show so much more details to an object.

http://www.astrodon.com/products/filters/narrowband/

http://www.astrodonimaging.com/gallery/ ... ?imgID=148

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