Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..393l&link_type=abstract
Astronomy and Astrophysics 285, 393-403 (1994)
Astronomy and Astrophysics
Astrophysics
16
Galaxies: Jets, Quasars: Individual: 3C395, Techniques: Interferometric, Radio Continuum: Galaxies
Scientific paper
We present the results of simultaneous VLBI observations of the quasar 3C395 at 2.3 and 8.4 GHz. Our maps show two well defined components (A and B) together with a weaker component in between (C2). The position of component C2 is compatible with the position of a component observed at epoch 1986.9 (component C1). We can interpret this positional coincidence i) assuming that component C2 and component C1 are just the same one, and hence C2 is stationary, or ii) considering that component C2 has travelled from the core to its current position, which now is coincident with the position of component C1 observed in 1986.9. The latter interpretation is supported by the total flux density evolution of 3C395. Based on this idea, we also present a model for 3C395 and numerical simulations of the time evolution of the emission of the compact structure at 2.3, 4.9 and 8.4 GHz which allow us to construct simulated maps of 3C395. The model and numerical simulations also provide a quantitative positional shift for the opaque core at 2.3 GHz with respect to 8.4 GHz which helps us to construct a spectral-index map of the source. Finally, our re-analysis of intermediate resolution VLBI observations at 0.6 GHz contribute to clarify the behavior of the jet beyond the cm-VLBI structure.
Alberdi Antonio
Lara Liana
Marcaide Juan Maria
Muxlow Thomas W. B.
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