arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.1213astro-ph
收藏

高功率FRII射电半导体的物理性质

Physical Properties of Very Powerful FRII Radio Galaxies

Christopher P. O'Dea, Ruth A. Daly, Preeti Kharb, Kenneth A. Freeman, Stefi A. Baum

摘要:

我们估计年龄和强大的射电星系的物理性质。分析了11个红移在0.4和1.3之间的非常强大的经典双(FRIIb)射电星系的新的多波长VLA观测。我们估计每个源的每一侧的年龄和速度。11个新的来源与以前研究的样本相结合,并研究了31个来源的完整样本的特性;完整样本包括红移在0.056和1.79之间的来源,核心热点大小约为30至400 kpc。的速度是独立的核心热点分离,这表明一个给定的源的增长率是大致恒定的源的寿命。我们结合的增长率,宽度和压力的来源,研究光束功率,寿命,能量和环境气体密度使用以前适用于较小的样品的标准方法。典型的光束功率范围从1 E44至1 E46 erg/s,我们表明,这个数量是不敏感的最小能量条件的假设。束功率是独立的核心热点分离表明,一个给定的源的束功率大致恒定的源的寿命。典型的源的总寿命大约是E6到E7年,典型的总流出能量(E/c^2)大约是5(E5 - E6)个太阳质量。发现周围气体密度随着核心-热点距离的增加而减小,但没有红移依赖性。总的来说,这里研究的31个来源的样本所获得的结果与以前较小的样本所获得的结果是一致的。

英文摘要:

We estimate ages and physical properties of powerful radio galaxies. An analysis of new multi-wavelength VLA observations of eleven very powerful classical double (FRIIb) radio galaxies with redshifts between 0.4 and 1.3 is presented. We estimate ages and velocities for each side of each source. The eleven new sources are combined with previously studied samples and the characteristics of the full sample of 31 sources are studied; the full sample includes sources with redshifts between 0.056 and 1.79, and core-hot spot sizes of about 30 to 400 kpc. The velocities are independent of core-hotspot separation, suggesting the rate of growth of a given source is roughly constant over the source lifetime. We combine the rate of growth, width, and pressure of a source to study the beam power, lifetime, energy, and ambient gas density using standard methods previously applied to smaller samples. Typical beam powers are in the range from 1E44 to 1E46 erg/s; we show that this quantity is insensitive to assumptions regarding minimum energy conditions. The beam powers are independent of core-hotspot separation suggesting that the beam power of a given source is roughly constant over the source lifetime. Typical total source lifetimes are found to be about a few E6 to E7 years, and typical total outflow energies (E/c^2) are found to be about 5(E5 - E6) solar masses. Ambient gas densities are found to decrease with increasing core-hotspot distance, but have no redshift dependence. Overall, the results obtained with the sample of 31 sources studied here are consistent with those obtained earlier with smaller samples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑