Circumnuclear obscuration of the Circinus galaxy by a starburst-radiation supported wall
Circumnuclear obscuration of the Circinus galaxy by a starburst-radiation supported wall
复制标题
圆规座星系被星暴辐射支撑墙的核周遮蔽
DOI：
10.1051/0004-6361:20010461
复制
发表时间：
2001
影响因子：
6.5
通讯作者：
M. Umemura
中科院分区：
文献类型：
--
作者：
K. Ohsuga;M. Umemura
我们认为辐射流体动力学形成的尘埃壁在circumnuclear地区的CircinusSeyfert 2星系。重点讨论了环核星暴、核星暴和活动星系核（AGN）产生的辐射通量力，分析了环核区尘埃气体的平衡位形和稳定性。用来模拟引力场的质量分布由观测到的恒星和气体的旋转速度决定。此外，利用环核星暴的简单恒星演化，估算了星暴的热光度随时间的变化。结果表明，环核星暴辐射力对形成100 pc的辐射尘埃墙起着重要作用，它遮蔽了几个星等的环核区。还发现当环核区域被尘埃壁遮蔽时，环核星暴的年龄被限定为10 ^8 $ yr，这与观测推断的星暴年龄4 10 ^7 $ yr-1.5 10 ^8 $ yr相一致。
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 $\la$ 100 pc, which obscures the circumnuclear regions with $A_V$ 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 $\la 10^8$ yr, which is consistent with the age observationally inferred for the starburst, $4 10^7$ yr $-1.5 10^8$ yr.