News tagged with active galaxies
Continent-sized radio telescope takes close-ups of Fermi active galaxies
Apr 22, 2009 |
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An international team of astronomers has used the world's biggest radio telescope to look deep into the brightest galaxies that NASA's Fermi Gamma-ray Space Telescope can see. The study solidifies the link ...
Active galaxies are different near and far
Jan 06, 2009 |
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(PhysOrg.com) -- An ongoing X-ray survey undertaken by NASA's Swift spacecraft is revealing differences between nearby active galaxies and those located about halfway across the universe. Understanding these ...
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The Energy Sources of Ultraluminous Galaxies
Nov 27, 2009 |
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(PhysOrg.com) -- Ultraluminous infrared galaxies ((ULIRGs) are galaxies whose luminosity exceeds that of a trillion suns; for comparison, the Milky Way galaxy has a typical (and much more modest) luminosity ...
Verdict: Supermassive black holes not guilty of shutting down star formation
Jan 22, 2009 |
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(PhysOrg.com) -- A team of Yale University astronomers has discovered that galaxies stop forming stars long before their central supermassive black holes reach their most powerful stage, meaning the black ...
Galaxy Zoo Hunters Help Astronomers Discover Rare 'Green Pea' Galaxies
Jul 27, 2009 |
4.8 / 5 (11) |
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A team of astronomers has discovered a group of rare galaxies called the "Green Peas" with the help of citizen scientists working through an online project called Galaxy Zoo. The finding could lend unique ...
X-Ray Jets from Galaxies
Oct 19, 2009 |
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(PhysOrg.com) -- Some dramatic galaxies eject gigantic, collimated jets of ionized gas millions of light-years long, powered by the massive black holes at their centers. The ionized jets are detected at radio ...
The Milky Way's tiny but tough galactic neighbor
Oct 14, 2009 |
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In the new ESO image, Barnard's Galaxy glows beneath a sea of foreground stars in the direction of the constellation of Sagittarius (the Archer). At the relatively close distance of about 1.6 million light-years, ...
Fermi telescope finds gamma-ray galaxy surprises
Jul 14, 2009 |
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Back in June 1991, just before the launch of NASA's Compton Gamma-Ray Observatory, astronomers knew of gamma rays from exactly one galaxy beyond our own. To their surprise and delight, the satellite captured ...
RIT astronomer mines Spitzer Space Telescope data for massive starbursts
Dec 08, 2009 |
4.3 / 5 (3) |
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Understanding the evolution of galaxies is one of the biggest questions confronting astronomers today. Looking at distant astronomical objects gives scientists important clues to the origins of the Milky Way Galaxy and other ...
Galaxy Collision Switches on Black Hole
Dec 10, 2009 |
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(PhysOrg.com) -- This composite image of data from three different telescopes shows an ongoing collision between two galaxies, NGC 6872 and IC 4970.
Starbursts in Dwarf Galaxies are a Global Affair
Apr 30, 2009 |
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(PhysOrg.com) -- Bursts of star making in a galaxy have been compared to a Fourth of July fireworks display: They occur at a fast and furious pace, lighting up a region for a short time before winking out.
When It Comes to Galaxies, Diversity Is Everywhere
Sep 30, 2008 |
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(PhysOrg.com) -- There's an old saying in astronomy: "Galaxies are like people. They're only normal until you get to know them." That view is supported by a group of astronomers after using NASA's Hubble Space ...
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