The closest black hole to earth

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The Closest Black Hole to Earth

Sagittarius A* - The Nearest Supermassive Black Hole

Location and Distance

Sagittarius A* (SgrA*) is the closest known supermassive black hole to Earth, located at the center of our Milky Way galaxy, approximately 8 kiloparsecs (kpc) away from us 13. This black hole is situated in the Galactic Centre, making it a significant point of interest for astronomers studying the dynamics and evolution of our galaxy.

Historical Activity and X-ray Emissions

Although SgrA* is currently inactive, evidence suggests that it experienced a powerful outburst around six million years ago. During this period, its luminosity might have approached the Eddington limit, a theoretical maximum luminosity a black hole can achieve when there is a balance between the force of radiation acting outward and the gravitational force pulling inward . This outburst likely resulted from the accretion of gas or the tidal disruption of a star, leading to significant X-ray emissions. These emissions could have had a profound impact on the solar system, particularly on the atmospheres of gas giants and potentially influencing the evolution of Earth's primitive atmosphere .

Magnetic Field and Accretion Dynamics

Recent studies have revealed the presence of a strong magnetic field around SgrA*. This magnetic field plays a crucial role in the dynamics of gas accretion onto the black hole. It can influence the structure of the accretion flow, remove angular momentum from the infalling gas, and expel matter through relativistic jets. These processes contribute to the observed electromagnetic emissions from SgrA*, ranging from radio to X-ray wavelengths . The discovery of a pulsar near the Galactic Centre, exhibiting a large Faraday rotation, supports the existence of this dynamically significant magnetic field .

Conclusion

Sagittarius A* stands as the closest supermassive black hole to Earth, located at the heart of the Milky Way galaxy. Its historical outbursts and the presence of a strong magnetic field make it a focal point for understanding black hole accretion processes and their broader impact on the galaxy. The study of SgrA* continues to provide valuable insights into the behavior and influence of supermassive black holes.

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Most relevant research papers on this topic

A close-pair binary in a distant triple supermassive black hole system

Tight pairs of black hole binaries are more common than previously believed, providing a valuable constraint for low-frequency gravitational wave experiments.

Highly Cited

2014·

99citations

·R. Deane et al.

Nature·

DOI

A strong magnetic field around the supermassive black hole at the centre of the Galaxy

A strong magnetic field near the supermassive black hole at the center of the Milky Way could explain observed radio to X-ray emission from the black hole.

Highly Cited

2013·

379citations

·R. Eatough et al.

Nature·

DOI

The closest black holes

The closest black holes in our galaxy could be identified as faint high proper motion radio sources in SKA surveys, with a Bondi-Hoyle efficiency parameter 0.01 and velocities above current survey limits.

2013·

46citations

·R. Fender et al.

Monthly Notices of the Royal Astronomical Society·

DOI

The galactic center massive black hole and nuclear star cluster

The Galactic Center contains a massive black hole and a dense nuclear star cluster, with recent observations revealing a 'paradox of youth' in the vicinity of Sgr A*.

Highly Cited

2010·

792citations

·R. Genzel et al.

Reviews of Modern Physics·

DOI

Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole

The star S2's orbit shows the first detection of General Relativity's Schwarzschild Precession, supporting the theory of general relativity.

Highly Cited

2020·

466citations

·R. Abuter et al.

Astronomy & Astrophysics·

DOI

Two ten-billion-solar-mass black holes at the centres of giant elliptical galaxies

Two massive black holes with masses of 9.7 billion solar masses were discovered in giant elliptical galaxies NGC 3842 and NGC 4889, suggesting different evolutionary processes influence the growth of the largest galaxies and their black holes.

Highly Cited

2011·

317citations

·N. McConnell et al.

Nature·

DOI

Gravitational Wave Bursts from the Galactic Massive Black Hole

The detection rate of gravitational wave bursts from the Galactic massive black hole is sensitive to the inner cut-off of the stellar density profile, with no burst expected from the Virgo cluster.

2006·

41citations

·Clovis Hopman et al.

Monthly Notices of the Royal Astronomical Society·

DOI

Global telescope gears up to image black holes.

The global radio telescope, which combines radio telescopes from around the world, will be able to image black holes backlit by incandescent gas swirling around them.

2017·

1citation

·D. Clery

Science·

DOI

A unicorn in monoceros: the 3 M⊙ dark companion to the bright, nearby red giant V723 Mon is a non-interacting, mass-gap black hole candidate

The 3 M dark companion to the nearby red giant V723 Mon is a non-interacting, mass-gap black hole candidate, with the simplest explanation being a single compact object in the'mass gap'.

2021·

62citations

·T. Jayasinghe et al.

Monthly Notices of the Royal Astronomical Society·

DOI

A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way

The star closest to Sagittarius A* is on a bound, highly elliptical orbit around the Milky Way's supermassive black hole, supporting the existence of a central mass composed of (3.7 1.5) 106 solar masses.

Highly Cited

2002·

896citations

·R. Schödel et al.

Nature·

DOI

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