A Clash of Clusters Provides New Clue to Dark Matter
"A powerful collision of galaxy clusters has been captured by NASA's Hubble Space Telescope and Chandra X-ray Observatory. The observations of the cluster known as MACS J0025.4-1222 indicate that a titanic collision has separated the dark from ordinary matter and provide an independent confirmation of a similar effect detected previously in a target dubbed the Bullet Cluster. These new results show that the Bullet Cluster is not an anomalous case."
Selected coverage:
A Clash of Clusters Provides New Clue to Dark Matter
(HST News Center,
Chandra press room)
Cosmic crash unmasks dark matter
(BBC News)
Dark matter and normal matter 'divorce' in cosmic clash
(New Scientist)
Dark matter detected in cosmic crash
(MSNBC)
Powerful Cosmic Collision Creates Divorce of Matter
(SPACE.com)
Clash of Clusters Separates Dark Matter From Ordinary Matter
(Universe Today)
Cluster Smashup Is Dark Matter Proof
(National Geographic News)
NASA's Chandra Finds Black Holes Are 'Green'
"Black holes are the most fuel efficient engines in the universe, according to a new study using NASA's Chandra X-ray Observatory. By making the first direct estimate of how efficient or 'green' black holes are, this work gives insight into how black holes generate energy and affect their environment..."
Selected coverage:
NASA's Chandra Finds Black Holes Are "Green"
(Chandra press room,
NASA HQ)
Black holes are actually 'green'
(CNN.com,
SPACE.com)
Scientists: Black Holes Energy-Efficient
(Washington Post, FOXNews.com)
Black holes actually green: official
(The Register)
High efficiency of black hole 'engines' revealed
(New Scientist)
Older Black Holes Still Full of Energy
(Scientific American)
Black Holes Are "Green," X-Ray Study Says
(National Geographic News)
NGC 4696: Energy from a Black Hole
(Astronomy Picture of the Day)
Hot Studies of Dark Energy (NASA Space Science Update)
"Astronomers have detected and probed dark energy by applying a powerful, new method that uses images of galaxy clusters made by NASA's Chandra X-ray Observatory. The results trace the transition of the expansion of the Universe from a decelerating to an accelerating phase several billion years ago, and give intriguing clues about the nature of dark energy and the fate of the Universe..."
Selected coverage:
Chandra Opens New Line of Investigation on Dark Energy
(Chandra press room,
NASA HQ)
Universe given mid-life booster
(BBC News)
Chandra unlocking mystery of 'dark energy'
(CNN.com)
Galaxy cluster X-rays confirm dark energy
(New Scientist)
Chandra Observations Confirm Existence of Dark Energy
(Scientific American)
By X-Raying Galaxies, Researchers Offer New Evidence of Rapidly
Expanding Universe
(New York Times,
subscription required)
Astronomers Find More Evidence of 'Dark Energy'
(Washington Post,
subscription required)
X-ray Scan of Cosmos Probes Dark Energy
(SPACE.com)
Chandra `Hears' A Black Hole (NASA Space Science Update)
"NASA's Chandra X-ray Observatory has detected sound waves, for the first time, from a super-massive black hole. The "note" is the deepest ever detected from an object in the universe. The tremendous amounts of energy carried by these sound waves may solve a longstanding problem in astrophysics..."
Selected coverage:
Chandra "Hears" A Black Hole For The First Time
(Chandra press room,
NASA HQ)
Black hole hums B flat
(BBC News)
Supermassive Black Hole Sings for Its Supper
(Scientific American)
Music of the Heavens Turns Out to Sound a Lot Like a B Flat
(New York Times,
subscription required)
A Deep Voice From Deep Space
(Washington Post,
subscription required)
Black Hole Strikes Deepest Musical Note Ever Heard
(SPACE.com)
A Note on the Perseus Cluster
(Astronomy Picture of the Day)
Astronomers Take the Measure of Dark Matter in the universe (NASA)
"Using NASA's Chandra X-ray Observatory, astronomers have obtained their most accurate determination to date of the amount of dark matter in galaxy clusters, the most massive objects in the universe. The results provide an important step towards a precise measurement of the total matter density of the universe..."
Selected coverage:
Astronomers Take the Measure of Dark Matter in the universe
(Chandra press room)
Studies Pins Down Quantity, Size of Dark Matter in Universe
(SPACE.com)
The Matter Of Galaxy Clusters
(Astronomy Picture of the Day)
Chandra Catches Cannibal Galaxy in the Act (NASA)
"NASA's Chandra X-ray Observatory image of Perseus A provides new insight into how this supergiant galaxy has grown by cannibalizing other galaxies and gas in the vicinity. For the first time astronomers see an X-ray shadow cast by a smaller galaxy as its gas is being stripped away by the enormous galaxy...."
Selected coverage:
Chandra Catches Cannibal Galaxy in the Act
(Chandra press room,
Science Daily)
X-rays From The Perseus Cluster Core
(Astronomy Picture of the Day)
Astronomers Detect Activity from Quiet Supermassive Black Holes (NASA)
"Astronomers have heard the first shy words from seemingly quiet supermassive black holes in the form of a unique type of X-ray light. These black holes exist in the centers of the oldest, largest galaxies and have a mass of about a billion suns, compressed into a region comparable to the size of our solar system..."
Selected coverage:
Astronomers Detect Activity from "Quiet" Supermassive Black
Holes
(NASA;
images)