LOFAR VLBI studies at 55 MHz of 4C 43.15, a z=2.4 radio galaxy

• The correlation between radio spectral index and redshift has been exploited to discover high-redshift radio galaxies, but its underlying cause is unclear. It is crucial to characterize the particle acceleration and loss mechanisms in high-redshift radio galaxies to understand why their radio spectral indices are steeper than their local counterparts. Low-frequency information on scales of similar to 1 arcsec are necessary to determine the internal spectral index variation. In this paper we present the first spatially resolved studies at frequencies below 100 MHz of the z = 2.4 radio galaxy 4C 43.15 which was selected based on its ultrasteep spectral index (alpha

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

redshift

scintillation

sky survey

flux densities

quasars

catalog

spectral index

ghz sources

evolution

radio continuum: galaxies

galaxies: active

calibration

galaxies: individual: 4C 43.15

galaxies: jets

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art (ämneskategori)

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