27
Dec 13

Birth of black hole kills the radio star

Source: Space Daily

art-dark-gamma-ray-burst-lg

Perth, Australia (SPX) Dec 27, 2013 - Astronomers led by a Curtin University researcher have discovered a new population of exploding stars that "switch off" their radio transmissions before collapsing into a Black Hole. These exploding stars use all of their energy to emit one last strong beam of highly energetic radiation - known as a gamma-ray burst - before they die.(learn more)

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7
May 13

Herschel finds hot gas on the menu for Milky Way’s black hole

Credit: ESA/Herschel

Galactic_centre_large

ESA’s Herschel space observatory has made detailed observations of surprisingly hot molecular gas that may be orbiting or falling towards the supermassive black hole lurking at the centre of our Milky Way galaxy.(read more)

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5
May 13

Cosmic Flashes May Signal Birth of Black Holes

Source: The Daily Galaxy

BlackHole

When a massive star exhausts its fuel, it collapses under its own gravity and produces a black hole, an object so dense that not even light can escape its gravitational grip. According to a new analysis by an astrophysicist at the California Institute of Technology (Caltech), just before the black hole forms, the dying star may generate a distinct burst of light that will allow astronomers to witness the birth of a new black hole for the first time. (read more)

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27
Oct 12

Monster galaxy may have been stirred up by black-hole mischief

Source: ESA/Hubble heic1216


Monster galaxy lacks a bright core.
Image credits: NASA, ESA, M. Postman (Space Telescope Science Institute, USA),
T. Lauer (National Optical Astronomy Observatory, USA), and the CLASH team.

Astronomers using the NASA/ESA Hubble Space Telescope have obtained a remarkable new view of a whopper of an elliptical galaxy, with a core bigger than any seen before. There are two intriguing explanations for the puffed up core, both related to the action of one or more black holes, and the researchers have not yet been able to determine which is correct. (read more)

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4
Sep 12

WISE Survey Uncovers Millions of Black Holes

Source: NASA WISE


WISE has identified millions of quasar candidates.
Image credits: NASA/JPL-Caltech/UCLA

NASA's Wide-field Infrared Survey Explorer (WISE) mission has led to a bonanza of newfound supermassive black holes and extreme galaxies called hot DOGs, or dust-obscured galaxies.

Images from the telescope have revealed millions of dusty black hole candidates across the universe and about 1,000 even dustier objects thought to be among the brightest galaxies ever found. These powerful galaxies, which burn brightly with infrared light, are nicknamed hot DOGs.(read more)

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14
Jun 12

Black Hole Growth Found To Be Out Of Sync

Source: Chandra


Galaxies NGC 4342 and NGC 4291.
Image credits: X-ray: NASA/CXC/SAO/A.Bogdan et al;
Infrared: 2MASS/UMass/IPAC-Caltech/ NASA/NSF.

New evidence from NASA's Chandra X-ray Observatory challenges prevailing ideas about how black holes grow in the centers of galaxies. Astronomers long have thought that a supermassive black hole and the bulge of stars at the center of its host galaxy grow at the same rate -- the bigger the bulge, the bigger the black hole. However, a new study of Chandra data has revealed two nearby galaxies with supermassive black holes that are growing faster than the galaxies themselves.(read more)

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24
Feb 12

Chandra finds fastest wind from stellar-mass black hole

Source: NASA Chandra


Artist impression of stellar-mass black hole IGR J17091.
Image credits: NASA/CXC/M.Weiss.

Astronomers using NASA's Chandra X-ray Observatory have clocked the fastest wind yet discovered blowing off a disk around a stellar-mass black hole. This result has important implications for understanding how this type of black hole behaves.

The record-breaking wind is moving about 20 million mph, or about 3 percent of the speed of light. This is nearly 10 times faster than had ever been seen from a stellar-mass black hole.

Stellar-mass black holes are born when extremely massive stars collapse. They typically weigh between five and 10 times the mass of the sun. The stellar-mass black hole powering this super wind is known as IGR J17091-3624, or IGR J17091 for short. (read more)

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17
Feb 12

Hubble finds relic of a shredded galaxy

Source: ESA/Hubble Science Release heic1203


Star cluster surrounds wayward black hole in cannibal galaxy ESO 243-49.
Image credits: NASA, ESA, and S. Farrell (University of Sydney, Australia and University of Leicester, UK).

Astronomers using the NASA/ESA Hubble Space Telescope have found a cluster of young blue stars surrounding a mid-sized black hole called HLX-1. The discovery suggests that the black hole formed in the core of a now-disintegrated dwarf galaxy. The findings have important implications for understanding the evolution of supermassive black holes and galaxies. (read more)

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9
Feb 12

Chandra Finds Milky Way's Black Hole Grazing on Asteroids

Source: NASA Chandra


Supermassive black hole Sagittarius A* at the center of the Milky Way.
Credits: X-ray: NASA/CXC/MIT/F. Baganoff et al.; Illustrations: NASA/CXC/M.Weiss

The giant black hole at the center of the Milky Way may be vaporizing and devouring asteroids, which could explain the frequent flares observed, according to astronomers using data from NASA's Chandra X-ray Observatory.

For several years Chandra has detected X-ray flares about once a day from the supermassive black hole known as Sagittarius A*, or "Sgr A*" for short. The flares last a few hours with brightness ranging from a few times to nearly one hundred times that of the black hole's regular output. The flares also have been seen in infrared data from ESO's Very Large Telescope in Chile. (read more)

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15
Dec 11

RXTE detects 'Heartbeat' of smallest Black Hole candidate

Source: NASA

Artist's impression of a black hole's jets. Credit: NASA.

n international team of astronomers has identified a candidate for the smallest-known black hole using data from NASA's Rossi X-ray Timing Explorer (RXTE). The evidence comes from a specific type of X-ray pattern, nicknamed a "heartbeat" because of its resemblance to an electrocardiogram. The pattern until now has been recorded in only one other black hole system.

Named IGR J17091-3624 after the astronomical coordinates of its sky position, the binary system combines a normal star with a black hole that may weigh less than three times the sun's mass. That is near the theoretical mass boundary where black holes become possible.

Gas from the normal star streams toward the black hole and forms a disk around it. Friction within the disk heats the gas to millions of degrees, which is hot enough to emit X-rays. Cyclical variations in the intensity of the X-rays observed reflect processes taking place within the gas disk. Scientists think that the most rapid changes occur near the black hole's event horizon, the point beyond which nothing, not even light, can escape.

Astronomers first became aware of the binary system during an outburst in 2003. Archival data from various space missions show it becomes active every few years. Its most recent outburst started in February and is ongoing. The system is located in the direction of the constellation Scorpius, but its distance is not well established. It could be as close as 16,000 light-years or more than 65,000 light-years away.

The record-holder for wide-ranging X-ray variability is another black hole binary system named GRS 1915+105. This system is unique in displaying more than a dozen highly structured patterns, typically lasting between seconds and hours.(read more)

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14
Dec 11

VLT spots cloud being disrupted by black hole

Source: ESO Science Release eso1151


Simulation of the cloud being disrupted by a black hole.
Image credits: ESO/MPE/Marc Schartmann.

Astronomers using ESO’s Very Large Telescope have discovered a gas cloud with several times the mass of the Earth accelerating fast towards the black hole at the centre of the Milky Way. This is the first time ever that the approach of such a doomed cloud to a supermassive black hole has been observed. The results will be published in the 5 January 2012 issue of the journal Nature.(read more)

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20
Nov 11

Cygnus X-1: Chandra Adds to Black Hole Birth Announcement

Source: Chandra


Credit: Optical: DSS; Illustration: NASA/CXC/M.Weiss

On the left, an optical image from the Digitized Sky Survey shows Cygnus X-1, outlined in a red box. Cygnus X-1 is located near large active regions of star formation in the Milky Way, as seen in this image that spans some 700 light years across. An artist's illustration on the right depicts what astronomers think is happening within the Cygnus X-1 system. Cygnus X-1 is a so-called stellar-mass black hole, a class of black holes that comes from the collapse of a massive star. The black hole pulls material from a massive, blue companion star toward it. This material forms a disk (shown in red and orange) that rotates around the black hole before falling into it or being redirected away from the black hole in the form of powerful jets. (read source)

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7
Nov 11

Hubble Directly Observes the Disc Around a Black Hole

Source: ESA/Hubble Science Release heic1116


Image credits:NASA, ESA and J.A. Muñoz (University of Valencia)

A team of scientists has used the NASA/ESA Hubble Space Telescope to observe a quasar accretion disc — a brightly glowing disc of matter that is slowly being sucked into its galaxy’s central black hole. Their study makes use of a novel technique that uses gravitational lensing to give an immense boost to the power of the telescope. The incredible precision of the method has allowed astronomers to directly measure the disc’s size and plot the temperature across different parts of the disc.(read more)

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1
Oct 11

ESA's spacecraft reveals new anatomy around a black hole

Source: ESA


Artist's impression of the central engine of an active galaxy.
Image credits: NASA and M. Weiss (Chandra X-ray Center).

A fleet of spacecraft including ESA's XMM-Newton and Integral have shown unprecedented details close to a supermassive black hole. They reveal huge 'bullets' of gas being driven away from the 'gravitational monster'. (read more)

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2
Sep 11

Chandra Finds Nearest Pair Of Supermassive Black Holes

Source: NASA Chandra


Spiral galaxy NGC 3393.
Image credits: X-ray: NASA/CXC/SAO/G.Fabbiano et al; Optical: NASA/STScI

Astronomers using NASA's Chandra X-ray Observatory discovered the first pair of supermassive black holes in a spiral galaxy similar to the Milky Way. Approximately 160 million light years from Earth, the pair is the nearest known such phenomenon. The black holes are located near the center of the spiral galaxy NGC 3393. Separated by only 490 light years, the black holes are likely the remnant of a merger of two galaxies of unequal mass a billion or more years ago. (read more)

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25
Aug 11

Swift satellite spots Black Hole devouring a Star

Source: NASA News/SWIFT


Image credit: NRAO/CfA/Zauderer et al

Two studies appearing in the August 25 issue of th journal Nature provide new insights into a cosmic accident that has been streaming X-rays toward Earth since late March. NASA's Swift satellite first alerted astronomers to intense and unusual high-energy flares from the new source in the constellation Draco. (read more)

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22
Aug 11

Black holes and pulsars could reveal extra dimensions

Source: New Scientist

Making a black hole let go of anything is a tall order. But their grip may slowly weaken if the universe has extra dimensions, something that pulsars could help us to test.

String theory, which attempts to unify all the known forces, calls for extra spatial dimensions beyond the three we experience. Testing the theory has proved difficult, however.

Now John Simonetti of Virginia Tech in Blacksburg and colleagues say black holes orbited by neutron stars called pulsars could do just that - if cosmic surveys can locate such pairings. "The universe contains 'experimental' setups we cannot produce on Earth," he says.

Black holes are predicted to fritter away their mass over time by emitting particles, a phenomenon called Hawking radiation. Without extra dimensions, this process is predicted to be agonisingly slow for run-of-the-mill black holes weighing a few times as much as the sun, making it impossible to measure.

Extra dimensions would give the particles more ways to escape, speeding up the process. This rapid weight loss would loosen a black hole's gravitational grip on any orbiting objects, causing them to spiral outwards by a few metres per year, the team calculates (The Astrophysical Journal, DOI: 10.1088/2041-8205/737/2/l28).

A pulsar orbiting a black hole could reveal this distancing. That's because the lighthouse-like pulses of radiation they emit would vary slightly depending on the size of the star's orbit. (read source)

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30
Jul 11

Black Hole collision may have set off fireworks in the Milky Way

Source: Science Magazine AAAS


Detailed view of the Milky Way's core.
Image credits: NASA/ESA/SSC/ CXC/ STScI

The Milky Way's center houses a supermassive black hole so sleepy that it probably hasn't swallowed a decent meal for years. Yet a growing body of evidence indicates that the now-dormant beast, about as massive as 4 million suns, fueled a firestorm of activity just a few million years ago, including the sustained emission of some of the highest energy radiation in the universe. A new study offers a dramatic explanation for these past fireworks: The sleeping giant woke when a smaller black hole from another galaxy smashed into it.(read more)

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28
Jul 11

Chandra Observatory images gas flowing toward black hole

Source: NASA/Chandra


Composite image of galaxy NGC 3115.
Image credits: X-ray: NASA/CXC/Univ. of Alabama/K. Wong et al; Optical: ESO/VLT.

The flow of hot gas toward a black hole has been clearly imaged for the first time in X-rays. The observations from NASA's Chandra X-ray Observatory will help tackle two of the most fundamental problems in modern astrophysics: understanding how black holes grow and how matter behaves in their intense gravity.

The black hole is at the center of a large galaxy known as NGC 3115, which is located about 32 million light years from Earth. A large amount of previous data has shown material falling toward and onto black holes, but none with this clear a signature of hot gas.

By imaging the hot gas at different distances from this supermassive black hole, astronomers have observed a critical threshold where the motion of gas first becomes dominated by the black hole's gravity and falls inward. This distance from the black hole is known as the "Bondi radius." (read more)

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