Issue |
A&A
Volume 371, Number 3, June I 2001
|
|
---|---|---|
Page(s) | 890 - 894 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20010461 | |
Published online | 15 June 2001 |
Circumnuclear obscuration of the Circinus galaxy by a starburst-radiation supported wall
Center for Computational Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
Corresponding author: K. Ohsuga, ohsuga@rccp.tsukuba.ac.jp
Received:
16
March
2000
Accepted:
23
March
2001
We consider the radiation-hydrodynamical
formation of a dusty wall in the circumnuclear regions of
the Circinus Seyfert 2 galaxy.
We focus on the radiative flux force
due to the circumnuclear starburst, the nuclear starburst and
the active galactic nucleus (AGN),
and analyze the equilibrium configuration and stability of the dusty gas
in the circumnuclear regions.
The mass distributions used
to model the gravitational fields
are determined
by the observed rotation velocities of the stars and of the gas.
Moreover, by using the simple stellar evolution in the circumnuclear starburst,
the bolometric luminosity of the starburst is estimated
as a function of time.
As a result, it is shown that
the radiation force
by the circumnuclear starburst
does play an important role to build up
a radiatively-supported dusty wall of 100 pc,
which obscures the circumnuclear regions with AV of a few magnitudes.
It is also found that the
age of a circumnuclear starburst when the circumnuclear regions are
enshrouded by the dusty wall is constrained to be
108 yr, which
is consistent with the age observationally inferred for
the starburst, 4 107 yr-1.5 108 yr.
Key words: galaxies: active / galaxies: individual: Circinus / galaxies: nuclei / galaxies: starburst / radiative transfer
© ESO, 2001
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