Category Archives: Astronomy

Gustafsson in PPC-CERN: “Fermi Gamma-ray Space Telescope Observations of the Galactic Center”

Posted on June 19, 2011 by

  A forthcoming paper of the Fermi-LAT Collaboration will describe method and results yielding to the left plot (the right one is widely known).  A map of the galactic center after 2 years of Fermi operation by the Large Area Telescope (LAT) … Continue reading →

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Serpico at PPC-CERN: “Theoretical aspects of dark matter indirect detection”

Posted on June 19, 2011 by

“Dark Matter (DM) was already discovered indirectly: via gravity. But gravity is “universal” and does not permit particle identification: a discovery via electromagnetic, strong or weak probes is needed. The LHC at CERN was designed to study the electroweak (EW) scale, however there … Continue reading →

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Haiman in Nature, “Cosmology: A smoother end to the dark ages”

Posted on April 6, 2011 by

“Independent lines of evidence suggest that the first stars, which ended the cosmic dark ages (lasting for 100 million years), came in pairs rather than singly. The appearance of the first stars marked a significant milestone, separating the history of … Continue reading →

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Fitzpatrick on “UV spectral synthesis of Vega” and the “A-star puzzle”

Posted on March 9, 2011 by

An A-type main-sequence star is a main-sequence (hydrogen-burning) star of spectral type A and luminosity class V. These stars have spectra which are defined by strong hydrogen Balmer absorption lines, have masses from 1.4 to 2.1 times the mass of the … Continue reading →

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Triply eclipsing solar system discovered by Kepler spacecraft

Posted on January 13, 2011 by

“This movie shows the dynamical evolution of the KOI-126 system over the time of the Kepler spacecraft observations used in the determination of the system parameters. The thin top panel shows the three stars (A, B, and C) relative to … Continue reading →

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