Our ky Dairy Galaxy has a secret heart of darkness, shrouded in mystery, well hidden from our view. A powerful gravitational beast lives in this strange region a huge black hole by name: Sagittarius A *–or: Sgr A * (Pronounced: saj-a-star:In short, it weighs millions of times more than our Ar!
Although Sgr A * He hid many of his secrets from the curious eyes of curious astronomers, now he is finally starting to tell his story, what a story it is. In May 2018, astronomers using NASA Chandra X-ray Observatory, said they had found thousands of relatively small pieces of evidence black holes of stellar mass, performing an exotic ballet near the dark heart of our galaxy, where: Sgr A * lives Black holes of stellar mass usually weighing 5 to 30 times the mass of the sun, նոր this newly “discovered” treasure filled with these “smaller” objects is located within three light years from where Sgr A * There is a secret, evil splendor – a charming heart of darkness that holds things.
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Three light years is a very short distance on space scales. Theoretical studies of the dynamics of stars living in galaxies suggest that a significant population black holes of stellar mass– maybe up to 20,000 – can wander in as time goes on, eventually gathering around Sgr A *, This latest study using the data obtained Chandra provides the first observational evidence of the existence of such a mess as witchcraft black holes our ky in his Katyn heart.
Stellar mass objects are born especially as a result of the gravitational collapse of a massive star. This strange birth is usually heralded by a brilliant display of celestial fireworks called a supernatural, Supernatural stars They are the brightest stellar explosions known, այնքան they are so bright that they can often be seen up to the end of the Universe,, they can actually surpass their entire galactic host in the span of space-time to blink briefly. Black holes of stellar mass often called collapses
a stellar mass Black hole, which is tightly closed in the orbit of the star, will steal gas from its unfortunate companion. Astronomers call these systems X-ray binaries:, The stolen stellar material is spilled a disk: which heats up to millions of degrees and emits X-rays before disappearing into the hungry ashes of a gravitational beast. Some of them X-ray binary appear as point-like sources Chandra image:
Therefore: Black hole observed on X-rays. In contrast, the dead companion star can be viewed by astronomers through optical telescopes. Emission of energy of both black holes և: neutron stars are the same size և, which is why astronomers often find it difficult to distinguish between two objects.
Neutron stars are very dense, urban-sized remnants of a massive star that were destroyed in the fiery fireworks of a supernatural explosion. Indeed, neutron stars They are so thick that they are full of teaspoons neutron staritems can weigh as much as a school of whales. However, the huge stars that their descendants are neutron stars are not as massive as the stars that collapse to become black holes of stellar mass.
The good news is that neutron stars Some sports identification features. Neutron stars show differential rotation և can master ևmagnetic field տեղ localized explosions thermonuclear outbursts. When astronomers look at these fairytale properties, a compact object living in a binary system turns out to be neutron star– more than a black hole of stellar mass.
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The resulting masses come from observations compact X-ray sources which combine optical data with X-ray data. All neutron stars which have been found so far, show masses below 2.0 arcs. Nobody compact systems At masses higher than 2.0 solar masses observed, show the properties of a neutron star. Therefore, the combination of these properties makes the class more likely compact stars Sports masses higher than 2.0 solar masses are really real black holes of stellar mass.
Our Galaxy accepts a few black hole of stellar mass candidates who live closer to Earth than: Sgr A *Most of these candidates are members X-ray binary systems in which the compact member of the duo steals stellar material from a partner storage disk.
a Black hole– of any size – can be described as having only three properties. According to some so-called “There is no hair” theories, a Black hole has three basic properties: mass, electric charge և rotation (angular momentum). Scientists generally believe that all black holes are born in nature. However, a clear observation of this turn has not been recorded, at least not yet. The rotation of A. black hole of stellar mass due to the maintenance of the angular momentum of the mass prenatal star that produces it.
Gravitational collapse of a massive star is a natural process. Inevitably, when a huge star finally reaches the end of that long stellar journey, in which all its stellar energy sources are depleted, it will collapse under its own gravitational pull, and then “blow” into the fiery bays. big final supernova explosion. If the mass of the collapsing part of the prenatal star is lower than the limit neutron degraded material (Tolman-Oppenheimer-Volkoff – TOV – boundary), the end result is a compact star. A compact star can be or a white dwarf or a neutron star–but it may be also be a hypothetical stellar object called a quark star. However, if the prenatal star, which is in the process of collapsing, consumes more mass in sports than TOV limit:, intensive self-weighting will continue կշ will continue on: until it reaches zero volume և new black hole of stellar mass is born around that point in space.
According to Albert Einstein Theory of general relativity (1915), a Black hole any mass can exist in nature. The lower the mass, the higher the density of the material to give a Black hole. No known process can Black hole several times less blood mass. If there are: black holes in that small, anywhere in the universe, they are probably primitive black holes,
Over the past twenty years, astronomers have been able to gather enough evidence to support the idea that our ky is actually hosting its Milk. oversaturated the beast of darkness in his secret heart. There, hidden in the center of our galaxy, awaits his supper, a crushed star or a doomed gas cloud. Because this mysterious object is hidden close to our own planet, it provides valuable information to astronomers about the fascinating, disturbing, and puzzling weather of extreme severity. Because of this, Sgr A * also sheds a fascinating new light General relativityBecause: black holes Astronomers try to understand their exotic properties by observing the light emitted by opaque radiant gas (storage disk),
A treasury of stellar mass black holes
A team of astronomers led by Dr. Charles Haley of Columbia University in New York used the data. Chandra to catch X-ray binary which contain: black holes living nearby Sgr A *: Scientists have studied the X-ray spectrum of sources living in our Mil Milk at about 12 light-years (the number of X-rays viewed at different energies). oversaturated dark heart.
The team then selected sources that showed X-ray spectra, such as known sources X-ray binaries: which showed a relatively large number of low-energy X-rays. Using this technique, scientists were able to detect fourteen X-ray binaries: is about three light-years away Sgr A *: The X-ray duo is thought to contain: neutron stars. This probability is based on the detection of the characteristic neutron star eruptions seen in previous studies. Therefore, both sources have been removed from the analysis.
Dr. Hale և his team concluded that most of the others X-ray binary probably contain: black holes of stellar mass. The amount of variability displayed over the years varies from forecast to forecast X-ray binaries: Hosting: neutron stars.
Only the brightest X-ray binaries: Containing: black holes are found in the distance of the inhabitants of our galaxy a huge black hole is from the country. Therefore, the findings included in this study suggest that a significantly larger population of undiscovered, weaker X-ray binary (at least 300 to a thousand) hosts black holes of stellar mass in the surrounding common district Sgr A *:
This population: black holes, which have a close stellar companion Sgr A *, can shed new light on the mysterious formation X-ray binary from the close transitions between the stars և black holes of stellar mass. This discovery may also help in further studies of the gravitational wave. That’s because knowing their number black holes, hidden in the heart of a typical galaxy, can help astronomers better predict how many gravitational wave events may be associated with them. Gravity waves are waves in the texture of Spacetime և they give astronomers a new way to study the Universe.
Even larger population black holes of stellar masswho are lonely և no companion star who calls them should also eat nearby Sgr A *: According to a theoretical study by Dr. Alexei Generozov (Columbia University), there should be more than 10,000 black holes of stellar mass chasing our Mil in the dark heart hidden in his Dairy galaxy.
While Dr. Hale’s colleagues are in favor of it black hole of stellar mass They do not rule out the possibility that 50% of the observed sources are really the population. millisecond pulsars, A Millisecond pulse is a fast, regularly rotating newborn neutron star, fresh from the burial mound of its super star, which was destroyed by a bright explosion of a supernova. Millisecond pulsars possess very strong magnetic fields.
An article describing these results is published in the April 5, 2018 issue of the journal Nature:
In: Chandra X-ray Observatory It is a space observatory launched by NASA on July 23, 1999.