NASA | Fermi Detects First Gamma-ray Pulsar in Another Galaxy
Δημοσιεύτηκε στις 12 Νοε 2015
Researchers
using NASA's Fermi Gamma-ray Space Telescope have discovered the first
gamma-ray pulsar in a galaxy other than our own. The object sets a new
record for the most luminous gamma-ray pulsar known.
The pulsar
lies in the outskirts of the Tarantula Nebula in the Large Magellanic
Cloud, a small galaxy that orbits our Milky Way and is located 163,000
light-years away. The Tarantula Nebula is the largest, most active and
most complex star-formation region in our galactic neighborhood. It was
identified as a bright source of gamma rays, the highest-energy form of
light, early in the Fermi mission. Astronomers initially attributed this
glow to collisions of subatomic particles accelerated in the shock
waves produced by supernova .
However, the discovery of
gamma-ray pulses from a previously known pulsar named PSR J0540-6919
shows that it is responsible for roughly half of the gamma-ray
brightness previously thought to come from the nebula.
Gamma-ray
pulses from J0540-6919 have 20 times the intensity of the previous
record-holder, the pulsar in the famous Crab Nebula. Yet they have
roughly similar levels of radio, optical and X-ray emission. Accounting
for these differences will guide astronomers to a better understanding
of the extreme physics at work in young pulsars.
Read more at http://www.nasa.gov/feature/goddard/n...
This video is public domain and can be downloaded at: http://svs.gsfc.nasa.gov/cgi-bin/deta...
Like our videos? Subscribe to NASA's Goddard Shorts HD podcast:
http://svs.gsfc.nasa.gov/vis/iTunes/f...
Or find NASA Goddard Space Flight Center on Facebook:
http://www.facebook.com/NASA.GSFC
Or find us on Twitter:
http://twitter.com/NASAGoddard
using NASA's Fermi Gamma-ray Space Telescope have discovered the first
gamma-ray pulsar in a galaxy other than our own. The object sets a new
record for the most luminous gamma-ray pulsar known.
The pulsar
lies in the outskirts of the Tarantula Nebula in the Large Magellanic
Cloud, a small galaxy that orbits our Milky Way and is located 163,000
light-years away. The Tarantula Nebula is the largest, most active and
most complex star-formation region in our galactic neighborhood. It was
identified as a bright source of gamma rays, the highest-energy form of
light, early in the Fermi mission. Astronomers initially attributed this
glow to collisions of subatomic particles accelerated in the shock
waves produced by supernova .
However, the discovery of
gamma-ray pulses from a previously known pulsar named PSR J0540-6919
shows that it is responsible for roughly half of the gamma-ray
brightness previously thought to come from the nebula.
Gamma-ray
pulses from J0540-6919 have 20 times the intensity of the previous
record-holder, the pulsar in the famous Crab Nebula. Yet they have
roughly similar levels of radio, optical and X-ray emission. Accounting
for these differences will guide astronomers to a better understanding
of the extreme physics at work in young pulsars.
Read more at http://www.nasa.gov/feature/goddard/n...
This video is public domain and can be downloaded at: http://svs.gsfc.nasa.gov/cgi-bin/deta...
Like our videos? Subscribe to NASA's Goddard Shorts HD podcast:
http://svs.gsfc.nasa.gov/vis/iTunes/f...
Or find NASA Goddard Space Flight Center on Facebook:
http://www.facebook.com/NASA.GSFC
Or find us on Twitter:
http://twitter.com/NASAGoddard
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