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Fermi coordinates, simultaneity, and expanding space in Robertson-Walker cosmologies
Fermi coordinates simultaneity
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2011/1/13
Explicit Fermi coordinates are given for geodesic observers comoving with the Hubble flow in expanding Robertson-Walker spacetimes, along with exact expressions for the metric tensors in Fermi coordin...
The First Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
gamma rays observations galaxies active galaxies jets BL Lacertae objects general
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2010/3/9
We present the first catalog of active galactic nuclei (AGN) detected by the LAT, corresponding to 11 months of data collected in scientific operation mode. The First LAT AGN Catalog (1LAC) includes 6...
H I spin temperature in the Fermi-LAT era
H I spin temperature Fermi-LAT era
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2010/3/8
The diffuse high-energy gamma-ray emission of the Milky Way arises from interactions of cosmic-rays (CRs) with interstellar gas and radiation field in the Galaxy. The neutral hydrogen (H I) gas compon...
The Cosmological Evolution of Blazars and the Extragalactic Gamma-Ray Background in the Fermi Era
Cosmological Evolution Blazars Extragalactic Gamma-Ray Background
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2010/3/8
The latest determination of the extragalactic gamma-ray background (EGRB) radiation by Fermi is compared with the theoretical prediction of the blazar component by Inoue & Totani (2009; hereafter IT09...
FERMI'S PARADOX - THE LAST CHALLENGE FOR COPERNICANISM?
Astrobiology Extraterrestrial intelligence Galaxy: evolution History and philosophy of astronomy
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2010/10/29
We review Fermi's paradox (or the "Great Silence" problem), not
only arguably the oldest and crucial problem for the Search for ExtraTerrestrial
Intelligence (SETI), but also a conundrum of profound...