black hole in center of milky way constellation

black hole in center of milky way constellation插图

Sagittarius A
Sagittarius A*,(in short Sgr ASagittarius ASagittarius A or Sgr A is a complex radio source at the center of the Milky Way which contains a supermassive black hole. It is located in the constellation Sagittarius, and is hidden from view at optical wavelengths by large clouds of cosmic dust in the spiral arms of the Milky Way.en.wikipedia.org*,pronounced saj a-star) the black hole at the center of the galaxy,is located in the direction of the constellation Sagittarius as seen from Earth. Astronomers have been studying the black hole’s environment for years.

Does Milky Way have black holes?

Though only a couple dozen black holes have been found so far in the Milky Way, there are thought to be hundreds of millions, most of which are solitary and do not cause emission of radiation. Therefore, they would only be detectable by gravitational lensing . Simulated view of a black hole in front of the Large Magellanic Cloud.

Is there a black hole near the Milky Way galaxy?

Yes, there is a super massive black hole at the center of our milky way galaxy. This is located in the Sagittarius constellation. Astronomers call this region of SM BH as SgrA*which is a complex radio source at the center of the Milky Way which contains a supermassive black hole.

Will our black hole eat the Milky Way?

The black hole at the center of the Milky Way is pulling the entire galaxy into itself. At some point in the far distant future, the massive black hole at the center of the Milky Way will ingest everything within it’s gravitational grasp. But don’t worry, it will take many billions if not trillions of years to happen.

Is there a black hole growing in the Milky Way?

Despite growing evidence, some scientists argue that there is no black hole at the center of the Milky Way. One suggestion, which doesn’t invoke dark matter, is that the center of the Milky Way is not dominated by a black hole of a giant mass, but perhaps by 4 million different objects in a very tight cluster that has the same gravitational effect.

What is the name of the black hole in the constellation Sagittarius?

The black hole itself is known as Sagittarius A* (pronounced "A-star"), for its location in the constellation Sagittarius. Normally, the black hole is quiet, producing billions of times less energy than giant black holes in other galaxies. But according to Inui and his colleagues, the black hole must have produced an incredible burst of X-ray light three centuries ago. They made this discovery by noticing a strange effect known as "light echoes."

Why did Sagittarius A* flare?

One possibility, says Koyama, is that a giant star exploded. The blast wave from the explosion plowed up gas and swept it into the black hole, leading to a temporary feeding frenzy that awoke the black hole from its slumber and produced the giant flare.

What satellites were used to study the cloud?

By using Japan’s Suzaku and ASCA X-ray satellites, NASA’s Chandra X-ray Observatory, and the European Space Agency’s XMM-Newton X-ray Observatory, Inui’s team could observe the behavior of the cloud between 1994 and 2005.

What causes light echoes in the galaxy?

These light echoes are caused by varying X-ray output from our galaxy’s central black hole. Credits: ASCA and Suzaku: JAXA; Chandra: NASA/CXC; XMM-Newton: ESA.

How are light echoes similar to sound waves?

Light echoes are similar to the sound echoes we hear when sound waves reverberate in a room or valley. In the case of light echoes, the X-rays produced by the giant outburst have been racing outward across trillions of miles of space at the speed of light. Three hundred years later, they have traveled far enough that they reach a giant gas cloud known as Sagittarius B2. Once they penetrate this cloud, they heat up the gas, and cause it to glow brightly in X-rays. But once the X-rays pass through the cloud, it cools down, and its brightness fades back to normal.

How many satellites have been used to find evidence of the black hole?

But a team of Japanese astronomers may have helped solve the mystery. By using four satellites that catch X-rays from outer space, they have found evidence that our black hole wasn’t so quiet 300 years ago. They have shown that the black hole let loose a powerful outburst of X-ray light.

When was Suzaku launched?

Launched in 2005, Suzaku is the fifth in a series of Japanese satellites devoted to studying celestial X-ray sources and is managed by the Japan Aerospace Exploration Agency. This mission is a collaborative effort between Japanese universities and institutions and NASA Goddard. Robert Naeye

Why are there blobs in a black hole?

Because each object follows a unique orbit, the theory that all of these blobs are knots of gas riding a single wheel of matter around the hole doesn’t hold up. The likeliest explanation, the authors wrote, is that the G blobs are the products of binary stars that got smooshed together by the black hole’s gravity — an explosive merger …

What is the black hole in the center of our galaxy?

The black hole at the center of our galaxy is warping and combining stars into a strange new kind of object, astronomers say. This illustration shows the six strange objects (dubbed G1 through G6) that astronomers detected swirling around our galaxy’s central black hole. The mysterious blobs orbit the hole every 100 to 1,000 years, …

What would happen if G2 was a cloud?

Astronomers predicted that, if G2 was just a cloud of gas, it would be torn to shreds by the intense gravity. But the blob survived — albeit a little misshapen. "At the time of closest approach, G2 had a really strange signature," Ghez said. "It went from being a pretty innocuous object when it was far from the black hole to one …

How often do blobs orbit the Milky Way?

The mysterious blobs orbit the hole every 100 to 1,000 years, stretching out as they approach. (Image credit: Anna Ciurlo, Tuan Do/UCLA Galactic Center Group) Like most large galaxies, the Milky Way is glued together by a supermassive black hole at its center, buried deep in the constellation Sagittarius. Our galaxy’s supermassive black hole, …

How long does it take for binary stars to merge?

Further, because stars take about 1 million years to merge, the objects may well have been born during the last known star formation event near Sgr A*, which took place about 5 million years ago.

When were the Wanderers of the Void discovered?

Wanderers of the void. The first two G objects were discovered in 2005 and 2012, respectively. Because the two objects followed a strikingly similar orbit around Sgr A*, some astronomers interpreted them as wisps of gas ripped away from an unfortunate dead star, or as clumped-up "knots" in a continuous ring of gas swirling around the hole.

Do stars compete for space?

Sometimes, stars closest to the black hole have to compete for space — and sometimes, a new study suggests, this competition becomes a strange and violent marriage.

What is the name of the black hole in the Milky Way?

But closer to home, at the center of our Milky Way galaxy, 26,000 light years from here, there is a faint source of radio noise called Sagittarius A, which they have concluded is a gigantic black hole, with a mass equivalent to four million suns.

How far is the Black Hole Express train from Earth?

This black hole express train, which is a mere 6,000 to 9,000 light years from Earth, might have been created by an exploding star in the inner dish of our Milky Way. The good news is that it’s around 8.4 billion miles from here; the troublesome news is that’s a small fraction of the 400 million light years (3,360 trillion miles) distance those other black holes are from Earth.

How far away is the Sun from the black hole?

In fact, our own Sun, which is by contrast only a small fraction of 1 percent of one light year distant (93 million miles), is expected to explode in a nova extravaganza in three billion years, and perhaps then collapse to form a small black hole of its own, dragging this Earth and our solar system into a gigantic super-massive planetary graveyard.

Is the Milky Way a prelude to the future?

Alas, our immediate future will be prelude. Scientists say that the merging of two similar-size galaxies into NGC 6240, resulting in the creation of the two ominous black holes, is a prelude to the future of our own Milky Way. They say that in about four billion years our Milky Way and the beautiful nearby Andromeda galaxy will collide and merge, fusing their black holes into one giant Darth Vader–style destruction force. But relax, no problem. That’ll be a full billion years after we are snuffed out when our Sun implodes.

Where is the black hole taking place?

No, don’t worry, this existential drama of the hungry black hole that weighs as much as 21 billion suns is taking place in a sprawling cloud of galaxies about 336 million light years away in the Coma constellation. That should put your mind at ease … at least for now.

How to find the mass of a star?

Using the highest resolution IR cameras available, astronomers have repeatedly observed the stars orbiting around Sgr A*. They have measured the orbit of a star that comes within 17 light-hours of the object in the core of our Galaxy, which is a distance that is only a few times larger than the orbit of Pluto around the Sun. Using Kepler’s laws, if we measure the period and semi-major axis of this star’s orbit around Sgr A*, we can calculate the mass of this object. The mass that results from the study of this star and other nearby stars is 4 million solar masses! The only type of object that astronomers believe can have a mass of approximately 4 million stars, but a radius of about 100 AU, is a black hole. Clearly the supernova explosion of one star could never produce a single black hole with a mass so large, so this object must have formed in a different manner. Sgr A* is one example of a class of objects called Super-Massive Black Holes, or SMBHs.

What does SNR mean in the Milky Way?

The objects with SNR in their names are supernova remnants, which should indicate that this is a region of the galaxy where there are young, massive stars forming. Clearly, this is a very complex region of the Milky Way with many overlapping structures.

How many solar masses are there in a black hole?

The mass that results from the study of this star and other nearby stars is 4 million solar masses! The only type of object that astronomers believe can have a mass of approximately 4 million stars, but a radius of about 100 AU, is a black hole.

Where is the black hole in the Milky Way?

The very center of our Galaxy in the core of the bulge is located in the direction of the constellation Sagittarius. The dust gets thicker and thicker as we look into the center of the Galaxy, so the best options for observing the Galactic center are in radio waves and in infrared light.

Is SGR A the center of the galaxy?

In the context of the Milky Way as a whole, Sgr A* is considered to be the very center of the Galaxy. However, you must keep in mind that this object is found in the central ~100 AU of a galaxy that is something like 30 kiloparsecs or more in radius, so in every image you have seen so far of the Milky Way Galaxy, Sgr A* would be much smaller than the single pixel in the center of the image.

Can SGR A be reduced to a few sources?

For example, the below image from the Chandra X-Ray Observatory, taken by Penn State Professor Emeritus Gordon Garmire’s team, reveals that Sgr A can be further reduced to a few sources, including a bright, small source called Sgr A*:

What happens to the light of a star as it passes through a black hole?

As the star gets closer to the supermassive black hole, its light undergoes a gravitational redshift that is predicted by Einstein’s general theory of relativity. (National Science Foundation graphic by Nicolle R. Fuller)

How does a black hole affect spacetime?

The 4 million-solar-mass black hole at the center of our galaxy warps spacetime, affecting the orbit of the star SO-2 when it gets near. The speed-up as it approaches produces a blueshift in light from the star, while astronomers observe a redshift when it moves away. At closest approach, the gravity is so great that light loses energy as it escapes. The relativistic effects caused by the huge mass of the black hole allowed University of California astronomers to test Einstein’s special and general theories of relativity. (Video courtesy of Nicolle R. Fuller, National Science Foundation)

Where are the lasers in the Milky Way?

Lasers from the twin Keck telescopes atop Maunakea in Hawaii propagate in the direction of the galactic center, the location of the supermassive black hole at the core of the Milky Way Galaxy. Each laser, part of the adaptive optics system, creates an artificial star that can be used to correct for the blurring due the Earth’s atmosphere, allowing precise tracking of the motion of stars around the black hole. (Photo courtesy of Ethan Tweedie, 2013)

Which star has enough measurements to test general relativity around a black hole?

The orbits of stars around the supermassive black hole at the center of our galaxy. The star S0-2 is the first star with enough measurements to test general relativity around a supermassive black hole. (Image courtesy of Keck/UCLA Galactic Center Group)

How far away is the black hole from the Sun?

The measurements also provided a more accurate mass for the black hole at the center of the galaxy — 3.984 million times the mass of the sun — and pinpointed its distance at 7,971 parsecs (25,916 light years).

Why does the light of a star turn bluer when moving away?

In addition, the special theory of relativity, which explains why people traveling at different speeds see time and space differently , says that the speed of the star will cause the light to be bluer when moving toward us and redder when moving away.

Why are black holes black?

Black holes are black because light emitted at the surface, or event horizon, cannot escape: It doesn’t have enough energy. The light falls back and orbits the black hole before eventually disappearing inside, so all we see is black.