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Black Holes

Second Black Hole at the Heart of the Milky Way

5 Nov , 2004 by Fraser Cain

A French/US team of astronomers have discovered a second black hole is lurking at the heart of our Milky Way galaxy, completely separate from the supermassive black hole that we’ve known about for years. This new object, IRS 13E, contains only 1,400 stellar masses, which is much less that the 4 million stellar masses of our supermassive black hole. IRS 13E probably used to be located far away from the galactic centre, where a cluster of stars could safely form. All that’s left now are a few massive stars whipping around the black hole as it spirals towards the centre of our galaxy.

Black Holes

Black Hole at the Heart of a Nebula

2 Jun , 2004 by Fraser Cain

Astronomers from the Harvard-Smithsonian Center for Astrophysics have found what they believe is an intermediate sized black hole at the heart of a nebula in a nearby galaxy. Since black holes themselves are invisible, they located it because a spot inside the nebula is emitting a tremendous amount of X-rays, and illuminating a 100 light-year swath. By calculating the amount of X-rays pouring out, astronomers estimate that the black hole has about 25-40 solar masses. It’s unknown how these intermediate-sized black holes form, since so few of them have ever been seen.

Black Holes

New Black Holes Found in a Virtual Observatory

29 May , 2004 by Fraser Cain

A team of European astronomers has used a virtual observatory to find 30 previously undiscovered black holes. The team combined images from several observatories (Hubble, Chandra, ESO) in many wavelengths of light (from infrared to X-ray) into a comprehensive computer catalog of the night sky. They uncovered these new black holes by looking at galaxies which are edge on, so the supermassive black holes at their centre are obscured by a cloud of gas and dust. By comparing between the different wavelengths of light, they were able to spot the new black holes.

Black Holes

Binary Black Holes Modeled on Computer

25 May , 2004 by Fraser Cain

Researchers from Penn State University have developed a computer model that describes the interaction of a binary black hole system; where two black holes orbit one another. Previous models have fallen apart because the gravity of the black holes distorts the surrounding space so dramatically, it’s almost impossible to calculate. This unusual situation could generate gravity waves detectable from Earth, which so far have only been theorized by mathematicians.

Black Holes

Black Holes Can Be Ejected From Galaxies

6 Feb , 2004 by Fraser Cain

Astronomers from several US universities have developed a scenario where colliding black holes could be ejected from their galaxy. When two galaxies merge, their central supermassive black holes will orbit one another and eventually collide. When this merge happens, the radiation pressure is so large that it could theoretically knock the black hole out of the centre of the galaxy. Although it should be incredibly rare, it could be possible to spot a black hole in a recently merged galaxy which isn’t at the centre where it normally belongs.

Black Holes

Star Seen Very Near Black Hole

23 Oct , 2002 by Fraser Cain

Image credit: ESO A team of astronomers have spotted an otherwise normal star make a close pass with the supermassive black hole that lurks at the centre of our Milky Way Galaxy. At its closest approach, the star was only 17 light-hours away from the black hole (three times the distance of the Sun to […]

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