IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Searching for evidence of jet-cloud interaction in radio galaxies. First results for 3C 381
Autor/es:
REYNALDI, MARÍA VICTORIA; CARLOS FEINSTEIN
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2013 vol. 430 p. 2221 - 2231
ISSN:
0035-8711
Resumen:
We present results of Gemini spectroscopy and Hubble Space Telescope
imaging of the 3C 381 radio galaxy. Possible ionizing mechanisms for the
extended emission-line region were studied through state-of-the-art
diagnostic analysis employing line ratios. Photoionization from the
central engine as well as mixed medium photoionization models fail in
reproducing both the strengths and the behaviour of the highest
excitation lines, such as [Ne V]λ3424, He II and [O
III]λ5007, which are measured at very large distances from the
active galactic nucleus. Shock-ionization models provide a better fit to
the observation. Expanding shocks with velocities higher than 500 km
s-1 are capable of reaching the observed intensity ratios for
lines with different ionization states and excitation degrees. This
model also provides a direct explanation of the mechanical energy input
needed to explain the high-velocity line-splitting observed in the
velocity field.