منابع مشابه
Origin of Galactic and Extragalactic Magnetic Fields
1Mpc). It is generally assumed that magnetic fields in spiral galaxies arise from the combined action of differential rotation and helical turbulence, a process known as the αω-dynamo. However fundamental questions concerning the nature of the dynamo as well as the origin of the seed fields necessary to prime it remain unclear. Moreover, the standard αω-dynamo does not explain the existence of ...
متن کاملThe Extragalactic Origin of the Arcturus Group
We reanalyze the group of stars associated kinematically with Arcturus (Eggen 1971), and confirm that they constitute a peculiar grouping of metal-poor stars with similar apocentric radius, common angular momentum, and distinct metal abundance patterns. These properties are consistent with those expected for a group of stars originating from the debris of a disrupted satellite. The Arcturus gro...
متن کاملOrigin of the high energy extragalactic diffuse gamma ray background.
We show that cosmic rays in external galaxies, groups and clusters rich in gas, with an average flux similar to that observed in the Milky Way, could have produced the observed extragalactic diffuse gamma radiation. PACS numbers: 98.70.Vc, 98.70.Sa, 98.65.Cw Submitted to Physical Review Letters Typeset using REVTEX e-mail: [email protected] e-mail: [email protected]
متن کاملGalactic vs. Extragalactic Origin of the Peculiar Transient Scp 06f6
We study four plausible scenarios for the SCP 06F6 transient event that was announced recently. Some of these were previously briefly discussed as plausible models for SCP 06F6, in particular with the claimed detection of a z = 0.143 cosmological redshift of a Swan spectrum of a carbon rich envelope. We cannot rule out any of these models, but can rank them from most to least preferred. For ext...
متن کاملGalactic Origin of the Alleged Extragalactic Gamma-Ray Background Radiation
The diffuse gamma-ray background radiation (GBR) at high Galactic latitudes could be dominated by inverse Compton scattering (ICS) of cosmic ray (CR) electrons on the cosmic microwave background radiation (CBR) and on starlight (SL) in an extended CR halo of our galaxy. Assuming the locally observed CR electron spectrum beyond a few GeV, which follows from equilibrium between Fermi acceleration...
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ژورنال
عنوان ژورنال: Nature Astronomy
سال: 2017
ISSN: 2397-3366
DOI: 10.1038/s41550-017-0304-0