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Your search keyword '"Milky Way -- Discovery and exploration"' showing total 24 results
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24 results on '"Milky Way -- Discovery and exploration"'

1. A strong magnetic field around the supermassive black hole at the centre of the Galaxy

Author

Eatough, R. P., Falcke, H., Karuppusamy, R., Lee, K. J., Champion, D. J., Keane, E. F., and Desvignes, G.

Subjects
Black holes (Astronomy) -- Research, Milky Way -- Discovery and exploration, Astronomical research, Magnetic fields -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

The unusually large Faraday rotation of a newly discovered pulsar indicates that there is a dynamically important magnetic field near the supermassive black hole believed to lie at the centre of the Milky Way. Strong magnetic field at Galactic Centre Sagittarius A.sup.*, at the centre of the Milky Way, harbours a strong candidate for a supermassive black hole. The source is thought to be powered by radiatively inefficient accretion of gas, with magnetic fields possibly helping the flow to occur. In most galaxies the accretion flow cannot be resolved directly and accretion models lack information about the initial conditions of the flow. Ralph Eatough et al. have determined magnetic field strength indirectly by measuring the rotation of radio emission from a new pulsar that erupted as an X-ray source near Sag A.sup.*. The results point to the presence of dynamically important magnetic field near the black hole. Earth's nearest candidate supermassive black hole lies at the centre of the Milky Way.sup.1. Its electromagnetic emission is thought to be powered by radiatively inefficient accretion of gas from its environment.sup.2, which is a standard mode of energy supply for most galactic nuclei. X-ray measurements have already resolved a tenuous hot gas component from which the black hole can be fed.sup.3. The magnetization of the gas, however, which is a crucial parameter determining the structure of the accretion flow, remains unknown. Strong magnetic fields can influence the dynamics of accretion, remove angular momentum from the infalling gas.sup.4, expel matter through relativistic jets.sup.5 and lead to synchrotron emission such as that previously observed.sup.6,7,8. Here we report multi-frequency radio measurements of a newly discovered pulsar close to the Galactic Centre.sup.9,10,11,12 and show that the pulsar's unusually large Faraday rotation (the rotation of the plane of polarization of the emission in the presence of an external magnetic field) indicates that there is a dynamically important magnetic field near the black hole. If this field is accreted down to the event horizon it provides enough magnetic flux to explain the observed emission--from radio to X-ray wavelengths--from the black hole., Author(s): R. P. Eatough [sup.1] , H. Falcke [sup.1] [sup.2] [sup.3] , R. Karuppusamy [sup.1] , K. J. Lee [sup.1] , D. J. Champion [sup.1] , E. F. Keane [sup.4] [...]

Published
2013
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2. A STAR'S DEATH GASPS: This ghostly nebula previews our Sun's fate

Author

Mclaughlin, Hailey Rose and Parks, Jake

Subjects
Milky Way -- Discovery and exploration, Atmospheric turbulence -- Influence, Nebulae -- Observations, Telescopes, Fate, Astronomy
Abstract

The Hubble Space Telescope has imaged the remnants of a dying star in the constellation Gemini the Twins several times. Because of its unique bilobed appearance, astronomers once thought the [...]

Published
2019

4. New Focus on Cool Planets and Hot Gas in Atlanta

Author

IRION, ROBERT

Subjects
W.M. Keck Observatory -- Discovery and exploration, Scientific satellites -- Discovery and exploration, Milky Way -- Discovery and exploration, Observatories -- Discovery and exploration, Titan (Satellite) -- Discovery and exploration, Beta Pictoris (Star) -- Discovery and exploration, Astronomical observatories -- Discovery and exploration, Science and technology, Discovery and exploration
Abstract

ATLANTA--About 1700 members of the American Astronomical Society preceded the Super Bowl here last month for their 195th national meeting. Astronomers scored big with news about ubiquitous black holes and [...]

Published
2000

5. A new Milky Way globular

Author

Talcott, Richard

Subjects
Stars -- Globular clusters, Astronomical research -- Discovery and exploration, Milky Way -- Discovery and exploration, Astronomy, Discovery and exploration
Abstract

Bright and showy, globular clusters stand out from far away. Surely, astronomers have cataloged all of our home galaxy's globulars, right? Not so fast. A team of European astronomers has [...]

Published
2007

6. A fugitive from the galaxy's edge: a century ago, a runaway star helped astronomers uncover the Milky Way's structure

Author

Croswell, Ken

Subjects
Milky Way -- Discovery and exploration, Stars -- Discovery and exploration, Astronomers -- Services -- Discovery and exploration, Astronomy, Discovery and exploration, Services
Abstract

Only 13 light-years away lies a unique star that holds clues to the formation of our galaxy: Kapteyn's Star. A refugee from the galactic halo, this star is one of [...]

Published
2006

7. Meet the neighbours

Author

Fick, Steven

Subjects
Milky Way -- Discovery and exploration, Stars -- Discovery and exploration, General interest, Geography, Discovery and exploration
Abstract

STANDING UNDER a starry sky on a clear summer night, it is hard to believe that our part of the galaxy is filled mainly with stars which are too dim [...]

Published
2001

8. Dark Secrets of the Milky Way

Subjects
Case Western Reserve University -- Officials and employees, Milky Way -- Discovery and exploration, College teachers -- Discovery and exploration, Observatories -- Discovery and exploration, Astronomers -- Discovery and exploration, Astronomical observatories -- Discovery and exploration
Published
2001

9. Eight more galaxies found orbiting the Milky Way

Author

Crockett, Christopher

Subjects
Galaxies -- Discovery and exploration, Milky Way -- Discovery and exploration, Science and technology
Abstract

The neighborhood around our galaxy is getting a little crowded. Eight more satellite galaxies have been found buzzing around the Milky Way, researchers report online August 16 at arXiv.org. This [...]

Published
2015

10. Galaxy may have gobs of Earth-size planets

Author

Kaufman, Marc

Subjects
Extrasolar planets -- Discovery and exploration, Milky Way -- Discovery and exploration, Solar system -- Research, Outer space -- Discovery and exploration
Published
2010

11. News From Home

Subjects
Milky Way -- Discovery and exploration, Astronomy -- Appreciation -- Discovery and exploration
Abstract

Until recently, astronomers believed that from where we sit -- some 28,000 light-years out -- we were spinning around the center of the Milky Way at about half a million […]

Published
2009

12. THE NATION; COLUMN ONE; A Whole Other Cosmos; With better tools and collaboration, scientists are discovering a more violent and vibrant universe than could be observed just years ago

Author

Cole, K.C.

Subjects
Laser interferometers -- Usage, Neutrinos -- Innovations, Milky Way -- Discovery and exploration, Interferometry -- Usage, Quasars -- Discovery and exploration, Stars -- Discovery and exploration, Galaxies -- Discovery and exploration, Infrared telescope -- Usage, Astrophysicists -- Equipment and supplies, Astrophysicists -- Discovery and exploration, Black holes (Astronomy) -- Discovery and exploration, Cosmology -- Discovery and exploration, Astronomers -- Equipment and supplies, Astronomers -- Discovery and exploration, X-ray telescope -- Usage, General interest, News, opinion and commentary
Published
2003

14. Pre-Galactic Star Cloud Is Discovered

Author

Harwood, William

Subjects
Outer space -- Discovery and exploration, Galaxies -- Discovery and exploration, Milky Way -- Discovery and exploration
Published
2001

16. 'New Jupiter' turns up in strange company. (Exoplanets)

Author

Goldsmith, Donald

Subjects
Planets -- Discovery and exploration, Milky Way -- Discovery and exploration, Science and technology, Discovery and exploration
Abstract

Planet hunters are expected to announce this week that they have discovered 13 new planets that orbit sunlike stars in our corner of the Milky Way. This new harvest, which [...]

Published
2002

17. Maybe we aren't alone

Subjects
United States. National Aeronautics and Space Administration -- Powers and duties, Planets -- Discovery and exploration, Milky Way -- Discovery and exploration, Outer space -- Discovery and exploration, General interest, News, opinion and commentary
Abstract

It was a promising week in the endless search for faraway life. A prominent group of astronomers said the Milky Way is home to at least 17 billion Earth-sized planets, [...]

Published
2013

23. Milky Way gobbles its closest known neighbor

Author

Cowen, R.

Subjects
Milky Way -- Discovery and exploration, Galaxies -- Discovery and exploration, Science and technology, Discovery and exploration
Abstract

Astronomers have discovered that the Milky Way is shredding a tiny galaxy into elongated streams of stars and claiming them for itself. At 42,000 light-years from our galaxy's center, the [...]

Published
2003

24. Telescope spies a galactic satellite. (Astronomy)

Subjects
Satellites -- Discovery and exploration, Milky Way -- Discovery and exploration, Science and technology, Discovery and exploration
Abstract

A huge gas cloud once considered a remnant from when the Milky Way or nearby galaxies formed is, in fact, a satellite of our galaxy, new radio telescope observations indicate. [...]

Published
2003

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