Issue |
A&A
Volume 386, Number 1, April IV 2002
|
|
---|---|---|
Page(s) | L1 - L4 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:20020135 | |
Published online | 15 April 2002 |
Letter to the Editor
Absorbers and globular cluster formation in powerful high-redshift radio galaxies
Landessternwarte Königstuhl, 69117 Heidelberg, Germany
Corresponding author: M.Krause@lsw.uni-heidelberg.de
Received:
14
December
2001
Accepted:
23
January
2002
A radiative hydrodynamic simulation for a typical, powerful high redshift
radio galaxy is presented.
The jet is injected at one third the speed of light into a 10 000
times denser, homogeneous medium.
In the beginning of the simulation, the bow shock consists of a
spherical shell that is similar
to a spherical blast wave.
This shell cools radiatively down to
K, providing after
yrs
a neutral column of
around the whole system. The shell starts to fragment and forms condensations.
This absorbing screen will cover a smaller and smaller
fraction of the radio source, and therefore the emission line region,
and eventually form stars in typically 104
globular clusters of
.
Approximately
are entrained into the radio cocoon.
This gas, cooling and illuminated from the radio source,
could be the emission line gas observed in high redshifted radio
galaxies and radio loud quasars.
The neutral column behind the bow shock can account for the
absorption found in almost all of the small sources.
The globular cluster excess
of
systems found
in present day brightest cluster galaxies (BCGs),
which are believed to be the vestiges of these objects,
is consistent with the presented scenario.
Key words: hydrodynamics / instabilities / shock waves / galaxies: jets / radiation mechanisms: thermal / intergalactic medium
© ESO, 2002
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