Скачать или смотреть Galactic Center of the Milky Way | Sagittarius A*, Globular Clusters and Galactic Halo

Galactic Center Of The Milky Way
A Supermassive Black Hole
4.3 Million Times Massive Than The Sun
A Bright And Very Compact Astronomical Radio Source
Far Away At The Center Of Our Galaxy, 27,000 Light Years Away

Due to the presence of the Zone of Avoidance, the Galactic Center can be observed only at gamma ray, hard x-ray, submillimeter and radio wavelengths, and not at visible, ultraviolet or soft x-ray.

Our galaxy has a distinct galactic halo, comprised of the stellar halo, the galactic corona and the dark matter halo. The stellar halo is a nearly spherical population of globular clusters, RR-Lyrae stars and subdwarfs. The globular clusters are comprised of very old low-metallicity stars, formed about 12 billion years ago.

Unlike the outskirts, the galactic center is very dense and compact. There are about 10 million stars within 1 parsec of the galactic core, mainly dominated by red supergiants, wolf-rayets and Sagittarius A*. Although there are old stars, many are relatively young. They seem to have all been formed a few million years ago. Some of which are in tight orbits around the Sagittarius A*. Star formation does not seem to occur currently. But the presence of circumnuclear disk of gas within 400 light years of the galactic center suggests a starburst event in about 200 million years.

The galactic corona is a distribution of hot ionized gas. It extends far beyond the center of the galaxy. The visible component of our galaxy is embedded in a much larger halo of dark matter, which constitutes 95% of our galaxy’s mass.

A complex astronomical radio source coincides with the center of the Milky Way, corresponding to Sagittarius A* and its accretion disk. Sagittarius A*, the central black hole has a radius of 22 million km, or 31 times than that of the sun. Rarely, gases orbiting the black hole, or even stars orbiting it very closely fall into it. Due to extreme gravitational pull and tidal forces, the falling star gets ripped apart. Leaving behind gas clouds in the form of accretion disks while radiating out tremendous amounts of electromagnetic radiations.
___________________________________________
SUBSCRIBE
Celeris