Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262..417t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. 417-423.
Astronomy and Astrophysics
Astrophysics
13
Active Galaxies, Astronomical Spectroscopy, Extragalactic Radio Sources, Galactic Structure, Particle Acceleration, Emission Spectra, Line Spectra, Spectrum Analysis
Scientific paper
We present new observations of the hot spots of 3C 295 at 1.7 GHz with 20 milliarcsecond resolution using the newly constructed Very Long Baseline Array (VLBA) of the NRAO. Our observations reveal a remarkable contrast in morphology between the northwest and southeast hot spots. The northwest hot spot is very compact with a bright central component of only 40 x 60 mas (280 x 410 pc)-squared, while the southeast hot spot has an elongated structure. From VLA and MERLIN observations at 15, 8, 6, and 1.7 GHz we find that the spectra of the two hot spots are consistent with a steep power law with no spectral break. The spectral index of the northwest hot spot is 1.0, and that of the southeast hot spot is 0.89. The absence of a break in the spectra of both hot spots is unusual. We have also analyzed the low frequency turnover in the integrated spectrum of 3C 295 in light of new observations made by Konstantin Sokolov with the UTR-2 telescope. We find that the low frequency turnover can be explained by thermal absorption from an inhomogeneous ISM.
Perley Richard A.
Taylor Greg B.
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