Showing posts with label black holes. Show all posts
Showing posts with label black holes. Show all posts

Saturday, January 7, 2017

Latest X-Ray Images Are Giving Astronomers A Revealing Look At The History Of Black Holes

The image is from the Chandra Deep Field-South. The full field covers an approximately circular region on the sky with an area about two-thirds that of the full moon. However, the outer regions of the image, where the sensitivity to X-ray emission is lower, are not shown here. The colors in this image represent different levels of X-ray energy detected by Chandra. Here the lowest-energy X-rays are red, the medium band is green, and the highest-energy X-rays observed by Chandra are blue. The central region of this image contains the highest concentration of supermassive black holes ever seen, equivalent to about 5,000 objects that would fit into the area of the full moon and about a billion over the entire sky. Image courtesy X-ray: NASA/CXC/Penn State/B. Luo et al. For a larger version of this image please go here.

Space Daily: Deepest X-ray image ever reveals black hole treasure trove

An unparalleled image from NASA's Chandra X-ray Observatory is giving an international team of astronomers the best look yet at the growth of black holes over billions of years beginning soon after the Big Bang. This is the deepest X-ray image ever obtained, collected with about 7 million seconds, or 11 and a half weeks, of Chandra observing time.

The image comes from what is known as the Chandra Deep Field-South. The central region of the image contains the highest concentration of supermassive black holes ever seen, equivalent to about 5,000 objects that would fit into the area of the full Moon and about a billion over the entire sky.

Read more ....

CSN Editor: It is hard to fathom how massive these objects really are .... ranging in mass from about 100,000 to 10 billion times the mass of the Sun.

Tuesday, June 5, 2012

Is Our Universe Existing In A Black Hole?

At the center of spiral galaxy M81 is a supermassive black hole about 70 million times more massive than our sun. Image credit: NASA/CXC/Wisconsin/D.Pooley & CfA/A.Zezas;NASA/ESA/CfA/A.Zezas; NASA/JPL-Caltech/CfA/J.Huchra et al.; NASA/JPL-Caltech/CfA

Every Black Hole Contains a New Universe -- Inside Science

(ISM) -- Our universe may exist inside a black hole. This may sound strange, but it could actually be the best explanation of how the universe began, and what we observe today. It's a theory that has been explored over the past few decades by a small group of physicists including myself.

Successful as it is, there are notable unsolved questions with the standard big bang theory, which suggests that the universe began as a seemingly impossible "singularity," an infinitely small point containing an infinitely high concentration of matter, expanding in size to what we observe today. The theory of inflation, a super-fast expansion of space proposed in recent decades, fills in many important details, such as why slight lumps in the concentration of matter in the early universe coalesced into large celestial bodies such as galaxies and clusters of galaxies.

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My Comment: This is a little too deep for me.

Monday, May 7, 2012

Black Holes Are Pretty Much the Sharks of Space

Black Hole Devouring Star NASA, S. Gezari (JHU), and J. Guillochon (UC Santa Cruz)

Omnivorous Black Holes Like This One Are Pretty Much the Sharks of Space - -Popular Science

Scientists from the Harvard-Smithsonian Center for Astrophysics and Johns Hopkins University report seeing a phenomenon we've all imagined: a black hole devouring a star.

A black hole at the center of a galaxy about 2.7 billion light-years away, one about the same size as the black hole at the center of our own Milky Way, was observed sucking the life out of a star. Interestingly, the scientists who observed the black hole's meal compared it to a shark: neither, says Ryan Chornock of Harvard-Smithsonian, are unstoppable eating machines.

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Friday, May 4, 2012

How Black Holes Work



Johns Hopkins Astronomer Discovers How Black Holes Work -- CBS

BALTIMORE (WJZ)– Johns Hopkins is again at the center of groundbreaking research. One of their astronomers had a simple idea, and as Mike Schuh reports, it led to a once in a lifetime discovery about black holes.

Black holes are out there sucking up stars like cosmic vacuum cleaners. But they’re invisible. We’ve never seen them work in real time… until now. A Hopkins-led team found a star caught by a black hole’s gravity.

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Friday, March 23, 2012

New Theory On Size Of Black Holes

Image from a simulation when the inclination is 150 degrees with full 3D rendering. (Credit: Image courtesy of University of Leicester)

New Theory On Size Of Black Holes: Gas-Guzzling Black Holes Eat Two Courses At A Time -- Science Daily

ScienceDaily (Mar. 23, 2012) — Astronomers have put forward a new theory about why black holes become so hugely massive -- claiming some of them have no 'table manners', and tip their 'food' directly into their mouths, eating more than one course simultaneously.

Researchers from the UK and Australia investigated how some black holes grow so fast that they are billions of times heavier than the sun.

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My Comment: Let`s just say that they are big and heavy.

Thursday, June 2, 2011

Black Holes Spinning Faster Than Ever

An artist’s impression of the jets emerging from a supermassive black hole at the centre of the galaxy PKS 0521-36. Credit: Dana Berry / STScI

Black Holes Are Spinning Faster Than Ever -- Cosmos

PORTSMOUTH: The giant black holes in the centre of galaxies are on average spinning faster now than at any time in the history of the universe, according to two U.K. astronomers.

The new discovery was made using radio, optical and X-ray data, and suggests that the supermassive black holes that grow by swallowing matter will barely spin, while those that merge with other black holes will be left spinning rapidly.

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Friday, May 27, 2011

A Closeup Of Black Hole Jets

Centaurus A Black Hole Jets This composite of visible, microwave (orange) and X-ray (blue) data reveals the jets and radio-emitting lobes emanating from Centaurus A's central black hole. NASA Goddard Space Flight Center

Galaxy Closeup Reveals Best-Ever Snapshot of Black Hole Jets -- Popular Science

A black hole with a mass of 55 million suns.

A gigantic black hole at the center of one of the Milky Way’s close neighbors is spewing jets of material into the cosmos, hurling gamma rays and radio waves into interstellar space. Now researchers in the U.S. and Germany peered at the galaxy with the closest-ever resolution, seeing galactic features up to 15 light-days across. That’s incredibly close for a galaxy 12 million miles away.

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Saturday, May 21, 2011

Radio Telescopes Capture Best-Ever Snapshot of Black Hole Jets

Merging X-ray data (blue) from NASA's Chandra X-ray Observatory with microwave (orange) and visible images reveals the jets and radio-emitting lobes emanating from Centaurus A's central black hole. (Credit: ESO/WFI (visible); MPIfR/ESO/APEX/A.Weiss et al. (microwave); NASA/CXC/CfA/R.Kraft et al. (X-ray))

From Science Daily:

ScienceDaily (May 20, 2011) — An international team, including NASA-funded researchers, using radio telescopes located throughout the Southern Hemisphere has produced the most detailed image of particle jets erupting from a supermassive black hole in a nearby galaxy.

"These jets arise as infalling matter approaches the black hole, but we don't yet know the details of how they form and maintain themselves," said Cornelia Mueller, the study's lead author and a doctoral student at the University of Erlangen-Nuremberg in Germany.

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Wednesday, September 22, 2010

Black Strings: Black Holes With Extra Dimensions

Five-dimensional black strings evolve into black holes connected by black string filaments, in this computer simulation. Credit: Pretorius/Lehner

From Live Science:

Meet the Bizarro universe version of a black hole: a black string.

These hypothetical objects might form if our universe has hidden extra dimensions beyond the three of space and one of time that we can see, scientists say. A new study of five-dimensional black strings offers a glimpse into how these strange objects might evolve over time – if indeed they exist at all.

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Thursday, September 9, 2010

Extreme X-Ray Source Suggests New Class of Black Hole

This is an artist's impression of the source HLX-1 (represented by the light blue object to the top left of the galactic bulge) in the periphery of the edge-on spiral galaxy ESO 243-49. This is the first strong evidence for the existence of intermediate mass black holes. (Credit: Heidi Sagerud)

From Science Daily:

ScienceDaily (Sep. 8, 2010) — A group of international astronomers in the UK, France and the USA, led by the University of Leicester, have found proof to confirm the distance and brightness of the most extreme ultra-luminous X-ray source, which may herald a new type of Black Hole.

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Sunday, September 5, 2010

Eternal Black Holes Are The Ultimate Cosmic Safes

There may be a way to create black holes that do not evaporate over time (Image: Copyright Denver Museum of Nature and Science)

From The New Scientist:

If you wanted to hide something away for all eternity, where could you put it? Black holes might seem like a safe bet, but Stephen Hawking famously calculated that they leak radiation, and most physicists now think that this radiation contains information about their contents. Now, there may be a way to make an "eternal" black hole that would act as the ultimate cosmic lockbox.

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Wednesday, September 1, 2010

Massive Mega-Star Challenges Black Hole Theories

This artist's impression shows the magnetar in the very rich and young star cluster Westerlund 1. This remarkable cluster contains hundreds of very massive stars, some shining with a brilliance of almost one million suns. Credit: ESO / L. Calçada.

From Live Science:

Astronomers have discovered a massive star that once dwarfed our sun and is now challenging theories of how stars evolve, die and form black holes.

The star is a peculiar cosmic object known as a magnetar. Magnetars are extremely dense, super-magnetic stars that can form from supernova explosions. [Photo of the massive star. ]

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My Comment: That is one hell of a big (and heavy) star.

Saturday, April 17, 2010

When Black Holes Go Rogue, They Kill Galaxies

A powerful jet from a supermassive black hole is blasting a nearby galaxy in the system known as 3C321 (Image: (NASA/CXC/CfA/D.Evans et al.; Optical/UV: NASA/STScI; Radio: NSF/VLA/CfA/D.Evans et al., STFC/JBO/MERLIN)

From New Scientist:

Massive black holes may be kicking the life out of galaxies by ripping out their vital gaseous essence, leaving reddened galactic victims scattered throughout the universe. While the case is not yet closed, new research shows that these black holes have at least the means to commit the violent crime.

It was already known that "supermassive" black holes at the centre of most galaxies sometimes emit vast amounts of radiation. But nobody had a good idea how common such violence is. A snapshot of the universe doesn't give enough information to judge this because the activity of the black holes is thought to be intermittent, depending on how much nearby matter they have to feed on.

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Monday, March 22, 2010

Supermassive Black Holes: Hinting at the Nature of Dark Matter?

Artist's schematic impression of the distortion of spacetime by a supermassive black hole at the centre of a galaxy. The black hole will swallow dark matter at a rate which depends on its mass and on the amount of dark matter around it. (Credit: Felipe Esquivel Reed)

From Science Daily:

Science Daily (Mar. 22, 2010) — About 23 percent of the universe is made up of mysterious 'dark matter' -- invisible material only detected through its gravitational influence on its surroundings. Now two astronomers based at the National Autonomous University of Mexico (UNAM) have found a hint of the way it behaves near black holes.

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Thursday, March 18, 2010

Astronomers Discover Most Primitive Supermassive Black Holes Known

This artist's conception illustrates one of the most primitive supermassive black holes known (central black dot) at the core of a young, star-rich galaxy. Astronomers using NASA's Spitzer Space Telescope have uncovered two of these early objects, dating back to about 13 billion years ago. The monstrous black holes are among the most distant known, and appear to be in the very earliest stages of formation, earlier than any observed so far. Unlike all other supermassive black holes probed to date, this primitive duo, called J0005-0006 and J0303-0019, lacks dust. As the drawing shows, gas swirls around a black hole in what is called an accretion disk. Usually, the accretion disk is surrounded by a dark doughnut-like dusty structure called a dust torus. But for the primitive black holes, the dust tori are missing and only gas disks are observed. This is because the early universe was clean as a whistle. Enough time had not passed for molecules to clump together into dust particles. Some black holes forming in this era thus started out lacking dust. As they grew, gobbling up more and more mass, they are thought to have accumulated dusty rings. This illustration also shows how supermassive black holes can distort space and light around them (see warped stars behind black hole). Stars from the galaxy can be seen sprinkled throughout, and distant mergers between other galaxies are illustrated in the background. (Credit: NASA/JPL-Caltech)

From Science Daily:

Science Daily (Mar. 18, 2010) — Astronomers have come across what appear to be two of the earliest and most primitive supermassive black holes known. The discovery, based largely on observations from NASA's Spitzer Space Telescope, will provide a better understanding of the roots of our universe, and how the very first black holes, galaxies and stars all came to be.

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Wednesday, January 27, 2010

'Farthest' Star-Mass Black Hole

An artist's impression of the black hole pulling gas off its companion

From The BBC:


Astronomers have spied a star-sized black hole much further away than any such object previously known.


It has a mass 20 times that of our Sun and is sited six million light-years away in the galaxy NGC 300.

The discovery was made using the Very Large Telescope (VLT) facility on Mount Paranal in Chile.

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Thursday, January 7, 2010

Tripping The Light Fantastic: 66 Black Holes Found 'Dancing' The Galactic Night Away

Hubble Space Telescope images of two small galaxies colliding to form one

From The Daily Mail:

It is the ultimate dance routine but get too close and it may be your last.

A team of astronomers have discovered 33 pairs of 'waltzing' black holes in distant galaxies which will eventually combine to form one.

Nearly every galaxy has a central super-massive black hole with a mass up to a billion times the mass of the Sun and galaxies often collide.

Read more ....

Wednesday, January 6, 2010

Intermediate Black Hole Implicated In Star's Death


From Discovery News:

Astronomers presenting at the American Astronomical Society (AAS) meeting in Washington D.C. on Jan. 4, have reported the detection of the emission generated by a black hole as it devoured a white dwarf star in the elliptical galaxy NGC 1399.

This may not appear to be a huge deal to begin with -- stars being eaten by supermassive black holes in the centers of galaxies have been detected before -- but it would appear that this particular white dwarf was ripped apart and then devoured by a mysterious "intermediate-mass" black hole.

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Monday, December 21, 2009

Black Holes In Star Clusters Stir Up Time And Space

An artist's representation of the burst of gravitational waves resulting from the collision of a colliding pair of black holes. (Credit: LIGO Scientific Collaboration (LSC) / NASA)

From Science Daily:

Science Daily (Dec. 21, 2009) — Within a decade scientists could be able to detect the merger of tens of pairs of black holes every year, according to a team of astronomers at the University of Bonn's Argelander-Institut fuer Astronomie, who publish their findings in a paper in Monthly Notices of the Royal Astronomical Society.

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Wednesday, December 16, 2009

Baby Black Holes Implicated In Universe's Mightiest Rays

Baby black holes occur when two types of dead star merge
(Image: Denver Museum of Nature & Science)


From New Scientist:

Baby black holes are puny compared with their humongous cousins at the centres of galaxies, but their birth may spew out the universe's mightiest particles.

Subatomic particles are routinely detected smashing into Earth's atmosphere at incredibly high energies, but the origin of these ultra-high-energy cosmic rays (UHECRs) remains a mystery. Some have argued that energy released by the collapse of a massive single star to form a black hole might produce the UHECRs, but the rate of such events is too low.

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