NOAO > Library > NOAO Preprint Series > Preprint 892
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NOAO > Library > NOAO Preprint Series > Preprint 892 |
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Author(s): Villar-Martin, M., De Young, D., et al.
Title: Shocks and Dust Survival in Nearby
Active Galaxies: Implications for the
Alignment Effect
Abstract:
One of the most popular explanations for the so-called alignment effect in
high
redshift (z>0.7) radio galaxies is the scattering by dust of the hidden quasar
light. As shown by De Young (1998) a problem with the dust scattering model is
that the short destruction time-scale for dust grains means that they will not
survive the passage of the radio jet.
We investigate the survival of dust in the extended ionised gas of nearby
active
galaxies with jet/gas interactions. We discuss the implications on the
alignment
effect of high redshift (>0.7) radio galaxies. We conclude that although
shocks
are likely to destroy dust grains in regions of interaction, dust might
survive
in enough quantities to scatter light from the active nucleus and produce
alignment between scattered light and the radio structures.
We propose an observational test to investigate the existence of dust in
shocked
regions based on the sensitivity of calcium to depletion onto dust grains.
Date Received:
September 19, 2001
Publication Info:
MNRAS 328:848-854
Telescopes:
None
Downloadable version (3391 Kb PDF)
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NOAO > Library > NOAO Preprint Series > Preprint 892 |
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