Fermi Hyperwall--2016 AAS Technical
Fermi observations suggest possible years-long cyclic changes in gamma-ray emission from the blazar PG 1553+113. The graph shows Fermi Large Area Telescope data from August 2008 to July 2015 for gamma rays with energies above 100 million electron volts (MeV). Background: One possible explanation for the gamma-ray cycle is an oscillation of the jet produced by the gravitational pull of a second massive black hole, seen at top left in this illustration.
Credits: NASA's Goddard Space Flight Center/CI Lab
Up-resed, 3x3 hyperwall-resolution plot identifies selected active galaxies detected by Fermi's LAT. Famous members of this class include NGC 1275 (the bright radio source Perseus A); M87, which sports a jet that can be seen in visible light; and Centaurus A (NGC 5128), whose jet has been operating long enough to form two lobes of radio- and gamma-ray-emitting gas, each up to a million light-years long.
Image credit: NASA/DOE/Fermi LAT Collaboration
Globular clusters are ancient groupings of stars that orbit our galaxy. This view of globular cluster NGC 6624 was imaged by the NASA's Hubble Space Telescope. The cluster is 27,000 light-years away and lies farther than the center of our galaxy in the constellation Sagittarius.
Credit: NASA/ESA/I. King, Univ. of Calif., Berkeley/Wikisky.org
This image is a view of the Sun captured by NASA’s Solar Dynamics Observatory on Oct. 7, 2010, while partially obscured by the Moon. A close look at the crisp horizon of the Moon against the Sun shows the outline of lunar mountains. A model of the Moon from NASA’s Lunar Reconnaissance Orbiter has been inserted into the picture, showing how perfectly the Moon's true topology fits into the shadow observed by SDO.
Illustration of one possible model for the dramatic changes observed from J1023. The two stars of AY Sextantis orbit closely enough that a stream of gas flows from the sun-like star toward the pulsar. The pulsar's rapid rotation and intense magnetic field produce both the radio beam and the high-energy wind, which is eroding its companion. When the radio beam (green) is detectable, the pulsar wind holds back the companion's gas stream, preventing it from approaching too closely.
Credit: NASA's Goddard Space Flight Center/Cruz deWilde
The white dwarf star in V407 Cygni, shown here in an artist's concept, went nova in 2010. Scientists think the outburst primarily emitted gamma rays (magenta) as the blast wave plowed through the gas-rich environment near the system's red giant star.
Credit: NASA's Goddard Space Flight Center/S. Wiessinger
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NASA's Goddard Space Flight Center