Black holes, the enigmatic celestial entities that captivate the imagination of scientists and sci-fi enthusiasts alike, remain one of the most mysterious phenomena in the universe.

Astronomers discovered new features of galactic black holes

<figure><img width="755" height="425" src="https://dailydosez.com/wp-content/uploads/2023/07/Astronomers-discovered-new-features-of-galactic-black-holes.jpg" alt="" srcset="https://dailydosez.com/wp-content/uploads/2023/07/Astronomers-discovered-new-features-of-galactic-black-holes.jpg 1280w, https://dailydosez.com/wp-content/uploads/2023/07/Astronomers-discovered-new-features-of-galactic-black-holes-300x169.jpg 300w, https://dailydosez.com/wp-content/uploads/2023/07/Astronomers-discovered-new-features-of-galactic-black-holes-1024x576.jpg 1024w, https://dailydosez.com/wp-content/uploads/2023/07/Astronomers-discovered-new-features-of-galactic-black-holes-768x432.jpg 768w, https://dailydosez.com/wp-content/uploads/2023/07/Astronomers-discovered-new-features-of-galactic-black-holes-150x84.jpg 150w"><figcaption dir="auto">Image Credit: Professor Wei Wang, Wuhan University</figcaption></figure><div data-meta-divider="circle" data-position="Second">
			By</div><div>SHARING IS CARING</div>Black holes, the enigmatic celestial entities that captivate the imagination of scientists and sci-fi enthusiasts alike, remain one of the most mysterious phenomena in the universe. These cosmic wonders come in various sizes, from stellar-mass black holes, about ten times the mass of our sun, to supermassive black holes, with masses reaching millions to billions of solar masses, lurking at the centers of galaxies. Among their intriguing manifestations are quasars, compact and brilliantly bright regions formed by supermassive black holes. Additionally, microquasars, a subset of accreting stellar-mass black holes capable of emitting highly magnetized plasma jets, add another layer of complexity to the cosmic tapestry.A recent groundbreaking discovery, led by an international team of scientists, including astrophysicist Bing Zhang from the University of Nevada, Las Vegas (UNLV), has shed new light on the mysterious world of microquasars. By employing the revolutionary Five-hundred-meter Aperture Spherical radio Telescope (FAST) in China, astronomers have made a pioneering revelation regarding a microquasar system designated GRS 1915+105. This groundbreaking discovery unveils hitherto unseen features of microquasars, enhancing our understanding of these captivating cosmic phenomena.<h2>The Remarkable FAST Discovery</h2>The unprecedented observational campaign on the galactic microquasar GRS 1915+105 has led to a momentous finding—a quasi-periodic oscillation (QPO) signal detected in the radio band. Notably, this is the first instance of such a signal being observed from any microquasar system. QPOs are a significant astronomical phenomenon, employed by researchers to comprehend the functioning of stellar systems like black holes. While QPOs have been previously detected in X-rays from microquasars, their presence in the system’s radio emission is an exceptional revelation, setting GRS 1915+105 apart.Professor Wei Wang, leading the team from China’s Wuhan University, expressed the significance of this peculiar QPO signal. With a rough period of approximately 0.2 seconds, equivalent to a frequency of about 5 Hertz, this signal manifests under specific physical conditions and does not persist continuously. The team’s fortune shone brightly, as they managed to capture the signal twice, in January 2021 and June 2022, respectively.<h2>Unveiling the Black Hole Jet</h2>According to Bing Zhang, the director of the Nevada Center for Astrophysics at UNLV and one of the corresponding authors of the study, this unique QPO feature may offer the first evidence of activity from a “jet” launched by a galactic stellar-mass black hole. In certain circumstances, black hole binary systems give birth to a jet—a dynamic mixture of charged matter and magnetic fields that move at near-light speeds.Zhang explained that in accreting black hole systems, X-rays typically probe the accretion disk encircling the black hole, while radio emission serves as an indicator of the jet launched from the disk and the black hole. The underlying mechanism responsible for the temporal modulation in a relativistic jet remains unidentified. However, one plausible explanation is the jet’s precession, wherein the jet direction periodically shifts, returning to its original orientation every 0.2 seconds.A potential cause for this effect could be a misalignment between the spin axis of the black hole and its accretion disk, which consists of extremely hot, bright spinning gases surrounding the black hole. This phenomenon arises as a natural consequence of spacetime dragging near a rapidly spinning black hole.<h2>Continuing the Quest for Understanding</h2>Despite this groundbreaking discovery, many questions about these mysterious QPO signals remain unanswered. Bing Zhang emphasizes that numerous possibilities exist, and continued observations of GRS 1915+105 and other galactic microquasars will provide further insights into these cosmic enigmas.<h2>Conclusion</h2>The recent discovery by the international team of scientists, facilitated by FAST’s exceptional capabilities, has unraveled unprecedented features of the microquasar system GRS 1915+105. This pioneering finding provides valuable evidence of a black hole jet’s activity and opens new avenues for understanding the captivating world of microquasars and the enigmatic nature of black holes in our vast universe. As technology and research continue to advance, the cosmos promises to unveil more of its mesmerizing secrets, inspiring scientists and stargazers to delve even deeper into the mysteries of the cosmos.<div>SHARING IS CARING</div>

Black holes, the enigmatic celestial entities that captivate the imagination of scientists and sci-fi enthusiasts alike, remain one of the most mysterious

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Black holes, the enigmatic celestial entities that captivate the imagination of scientists and sci-fi enthusiasts alike, remain one of the most mysterious phenomena in the universe.

These cosmic wonders come in various sizes, from stellar-mass black holes, about ten times the mass of our sun, to supermassive black holes, with masses reaching millions to billions of solar masses, lurking at the centers of galaxies.

Among their intriguing manifestations are quasars, compact and brilliantly bright regions formed by supermassive black holes. Additionally, microquasars, a subset of accreting stellar-mass black holes capable of emitting highly magnetized plasma jets, add another layer of complexity to the cosmic tapestry.

A recent groundbreaking discovery, led by an international team of scientists, including astrophysicist Bing Zhang from the University of Nevada, Las Vegas (UNLV), has shed new light on the mysterious world of microquasars.

By employing the revolutionary Five-hundred-meter Aperture Spherical radio Telescope (FAST) in China, astronomers have made a pioneering revelation regarding a microquasar system designated GRS 1915+105. This groundbreaking discovery unveils hitherto unseen features of microquasars, enhancing our understanding of these captivating cosmic phenomena.

The unprecedented observational campaign on the galactic microquasar GRS 1915+105 has led to a momentous finding—a quasi-periodic oscillation (QPO) signal detected in the radio band. Notably, this is the first instance of such a signal being observed from any microquasar system.

QPOs are a significant astronomical phenomenon, employed by researchers to comprehend the functioning of stellar systems like black holes. While QPOs have been previously detected in X-rays from microquasars, their presence in the system’s radio emission is an exceptional revelation, setting GRS 1915+105 apart.

Professor Wei Wang, leading the team from China’s Wuhan University, expressed the significance of this peculiar QPO signal.

With a rough period of approximately 0.2 seconds, equivalent to a frequency of about 5 Hertz, this signal manifests under specific physical conditions and does not persist continuously. The team’s fortune shone brightly, as they managed to capture the signal twice, in January 2021 and June 2022, respectively.

According to Bing Zhang, the director of the Nevada Center for Astrophysics at UNLV and one of the corresponding authors of the study, this unique QPO feature may offer the first evidence of activity from a “jet” launched by a galactic stellar-mass black hole.

In certain circumstances, black hole binary systems give birth to a jet—a dynamic mixture of charged matter and magnetic fields that move at near-light speeds.

Zhang explained that in accreting black hole systems, X-rays typically probe the accretion disk encircling the black hole, while radio emission serves as an indicator of the jet launched from the disk and the black hole.

The underlying mechanism responsible for the temporal modulation in a relativistic jet remains unidentified. However, one plausible explanation is the jet’s precession, wherein the jet direction periodically shifts, returning to its original orientation every 0.2 seconds.

A potential cause for this effect could be a misalignment between the spin axis of the black hole and its accretion disk, which consists of extremely hot, bright spinning gases surrounding the black hole. This phenomenon arises as a natural consequence of spacetime dragging near a rapidly spinning black hole.

Despite this groundbreaking discovery, many questions about these mysterious QPO signals remain unanswered. Bing Zhang emphasizes that numerous possibilities exist, and continued observations of GRS 1915+105 and other galactic microquasars will provide further insights into these cosmic enigmas.

The recent discovery by the international team of scientists, facilitated by FAST’s exceptional capabilities, has unraveled unprecedented features of the microquasar system GRS 1915+105.

This pioneering finding provides valuable evidence of a black hole jet’s activity and opens new avenues for understanding the captivating world of microquasars and the enigmatic nature of black holes in our vast universe.

As technology and research continue to advance, the cosmos promises to unveil more of its mesmerizing secrets, inspiring scientists and stargazers to delve even deeper into the mysteries of the cosmos.

Astronomers discovered new features of galactic black holes - Dailydosez - Nasa. Science. Tech

Astronomers discovered new features of galactic black holes

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