Starship Asterisk*

VictorBorun wrote: ↑Sun Jun 06, 2021 2:49 pm

neufer wrote: ↑Thu Jun 03, 2021 2:21 pm

• orange: 0.1–0.3 keV
  green: 0.3–1.55 keV
  blue: 1.55–3.34 keV
  purple: 3.34–10 keV

https://en.wikipedia.org/wiki/X-ray#Soft_and_hard_X-rays wrote:
<<X-rays with high photon energies above 5–10 keV (below 0.2–0.1 nm wavelength) are called hard X-rays, while those with lower energy (and longer wavelength) are called soft X-rays. The intermediate range with photon energies of several keV is often referred to as tender X-rays.

Due to their penetrating ability, hard [5–10 keV] X-rays are widely used to image the inside of objects, e.g., in medical radiography and airport security. Since the wavelengths of hard X-rays are similar to the size of atoms, they are also useful for determining crystal structures by X-ray crystallography.

By contrast, soft X-rays are easily absorbed in air; the attenuation length of 0.6 keV (~2 nm) X-rays in water is less than 1 micrometer.>>

So what do we make of this:

Click to view full size image

X-ray
4 Color[/img2]
?

The many little purple dots must be hot objects like neutron stars or black holes.

The northern and southern orange with a little hint of green chimneys' interiors must be relatively cold gas heated by massive BHs' jets.
But how do we get to see the X ray photons that soft? Where we can't see the light behind all the dust in the core of the Milky Way.

And the regions around the central BH and a few non-central supermassive BHs are bluish. I guess the image of the central clouds:
1) is depleted of its soft X rays by the dust in front of it
2) lacks the hard X rays because it's not hot enough

By the way, is every blindingly bright white globe here a supermassive BH in a moment of active feeding?
Why is there 3 of the largest ones to the South of Saggitarius A* and none to the North?
Is it why the Southern chimney is way denser than the Northern one?

neufer wrote: ↑Thu Jun 03, 2021 2:21 pm

• orange: 0.1–0.3 keV
  green: 0.3–1.55 keV
  blue: 1.55–3.34 keV
  purple: 3.34–10 keV

https://en.wikipedia.org/wiki/X-ray#Soft_and_hard_X-rays wrote:
<<X-rays with high photon energies above 5–10 keV (below 0.2–0.1 nm wavelength) are called hard X-rays, while those with lower energy (and longer wavelength) are called soft X-rays. The intermediate range with photon energies of several keV is often referred to as tender X-rays.

Due to their penetrating ability, hard [5–10 keV] X-rays are widely used to image the inside of objects, e.g., in medical radiography and airport security. Since the wavelengths of hard X-rays are similar to the size of atoms, they are also useful for determining crystal structures by X-ray crystallography.

By contrast, soft X-rays are easily absorbed in air; the attenuation length of 0.6 keV (~2 nm) X-rays in water is less than 1 micrometer.>>

VictorBorun wrote: ↑Wed Jun 02, 2021 9:41 pm

neufer wrote: ↑Wed Jun 02, 2021 5:17 pm Chandra's High Resolution Camera (HRC) has two micro-channel
plate components and images over the range of 0.1–10 keV ... so maybe:

• orange: 0.1–0.45 keV
  green: 0.45–2.2 keV
  purple: 2.2–10 keV

blue must be there:
Color Code X-ray: orange, green, blue, purple; Radio: lilac, gray;

https://chandra.harvard.edu/photo/false_color.html wrote:

• orange: 0.1–0.3 keV
  green: 0.3–1.55 keV
  blue: 1.55–3.34 keV
  purple: 3.34–10 keV

https://en.wikipedia.org/wiki/X-ray#Soft_and_hard_X-rays wrote:
<<X-rays with high photon energies above 5–10 keV (below 0.2–0.1 nm wavelength) are called hard X-rays, while those with lower energy (and longer wavelength) are called soft X-rays. The intermediate range with photon energies of several keV is often referred to as tender X-rays.

Due to their penetrating ability, hard [5–10 keV] X-rays are widely used to image the inside of objects, e.g., in medical radiography and airport security. Since the wavelengths of hard X-rays are similar to the size of atoms, they are also useful for determining crystal structures by X-ray crystallography.

By contrast, soft X-rays are easily absorbed in air; the attenuation length of 0.6 keV (~2 nm) X-rays in water is less than 1 micrometer.>>

neufer wrote: ↑Wed Jun 02, 2021 5:17 pm Chandra's High Resolution Camera (HRC) has two micro-channel
plate components and images over the range of 0.1–10 keV ... so maybe:

• orange: 0.1–0.45 keV
  green: 0.45–2.2 keV
  purple: 2.2–10 keV

https://chandra.harvard.edu/photo/2021/gcenter/index.html wrote: <<Also labeled in the main image are X-rays reflected from dust around bright X-ray sources (green circles), Sagittarius A*, and, in purple circles and ellipses, the Arches and Quintuplet Clusters, DB00-58 and DB00-6, 1E 1743.1-28.43, the Cold Gas Cloud and Sagittarius C.>>

VictorBorun wrote: ↑Wed Jun 02, 2021 2:42 pm
I am confused as to what bright spots does the Chandra site label with lime circles?

https://chandra.harvard.edu/photo/2021/gcenter/index.html wrote:
<<Also labeled in the main image are X-rays reflected from dust around bright X-ray sources (green circles), Sagittarius A*, and, in purple circles and ellipses, the Arches and Quintuplet Clusters, DB00-58 and DB00-6, 1E 1743.1-28.43, the Cold Gas Cloud and Sagittarius C.>>

VictorBorun wrote: ↑Wed Jun 02, 2021 2:42 pm
And I failed to find the legend of X-ranges mapping to orange green blue purple

• blue

• orange: 0.1–0.45 keV
  green: 0.45–2.2 keV
  purple: 2.2–10 keV

Ann wrote: ↑Wed Jun 02, 2021 9:05 am

Outflows from the core of the Milky Way. ESA.

---

The X-ray outflows from the core of the Milky Way appears to be tied to the enormous gamma ray bubbles, the Fermi Bubbles, that are found above and below the plane of the Milky Way, centered on the core of the Milky Way and its supermassive central black hole, Sagittarius A*. The X-ray outflows could be the mechanism that maintains the Fermi Bubbles and keeps them hot.

JohnD wrote: ↑Wed Jun 02, 2021 11:37 am Quote this APOD description, "Galactic beasts such as expanding supernova remnants, hot winds from newly formed stars, unusually strong and colliding magnetic fields, and a central supermassive black hole are all battling in a space only 1000 light years across."

I've asked this before, and been reassured, because 'Space is big,it's really big!" and the extraordinarily energetic parts are too far away to be a danger to life. But a " a space only 1000 light years across" isn't that big, is it? Full of the "hottest" X-rays that we can 'see' from 25,000 LY away. Does that mean that we can forget about 'life' on planets in that part of the Galaxy?

John

JohnD wrote: ↑Wed Jun 02, 2021 11:37 am Quote this APOD description, "Galactic beasts such as expanding supernova remnants, hot winds from newly formed stars, unusually strong and colliding magnetic fields, and a central supermassive black hole are all battling in a space only 1000 light years across."

I've asked this before, and been reassured, because 'Space is big,it's really big!" and the extraordinarily energetic parts are too far away to be a danger to life. But a " a space only 1000 light years across" isn't that big, is it? Full of the "hottest" X-rays that we can 'see' from 25,000 LY away. Does that mean that we can forget about 'life' on planets in that part of the Galaxy?

John