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arXiv 0803.1952astro-ph
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由H I观测导出的活动Galerkin的性质

Properties of Active Galaxies Deduced from H I Observations

Luis C. Ho, Jeremy Darling, Jenny E. Greene

摘要:

我们完成了一个新的调查,H I发射的一个大的,明确的154个附近的星系(z < 0.1)样本的类型1活动星系核。我们利用广泛的数据库中提出的配套文件进行全面评估的冷气含量在活动星系,并寻求新的策略来调查的主机星系的全球性及其与中央黑洞(BH)的关系。我们表明,BH质量服从一个强大的,大致线性关系与宿主星系的动力学质量。BH质量遵循一个松散的,但仍然非常显着的,与星系的最大旋转速度的相关性,从已知的旋转速度和中心速度色散之间的缩放预期。这两个基于H I的相关性都不如我们更熟悉的BH质量与核球光度或速度色散之间的关系那么紧密,但它们的优点是对核的眩光不敏感,因此是探测附近和遥远AGN的宿主星系的有前途的新工具。我们目前的证据表明,在最活跃的吸积活动星系核的大量持续BH的增长。在这些附近的系统中,BH的增长似乎相对于宿主星系的组装有所延迟,但在其他方面没有留下可检测到的质光比或其全球气体含量的扰动。1型活动星系核的宿主星系,包括那些足够明亮的类星体,通常是富含气体的系统,拥有至少与相同形态类型的不活跃星系一样丰富的冷星际介质库。这就对目前在星系形成模型中活动星系核反馈的实现提出了质疑,这些模型预测了在未被遮蔽的活动星系核中强烈的冷气体耗尽。(节录)

英文摘要:

We completed a new survey for H I emission for a large, well-defined sample of 154 nearby (z < 0.1) galaxies with type 1 AGNs. We make use of the extensive database presented in a companion paper to perform a comprehensive appraisal of the cold gas content in active galaxies and to seek new strategies to investigate the global properties of the host galaxies and their relationship to their central black holes (BHs). We show that the BH mass obeys a strong, roughly linear relation with the host galaxy's dynamical mass. BH mass follows a looser, though still highly significant, correlation with the maximum rotation velocity of the galaxy, as expected from the known scaling between rotation velocity and central velocity dispersion. Neither of these H I-based correlations is as tight as the more familiar relations between BH mass and bulge luminosity or velocity dispersion, but they offer the advantage of being insensitive to the glare of the nucleus and therefore are promising new tools for probing the host galaxies of both nearby and distant AGNs. We present evidence for substantial ongoing BH growth in the most actively accreting AGNs. In these nearby systems, BH growth appears to be delayed with respect to the assembly of the host galaxy but otherwise has left no detectable perturbation to its mass-to-light ratio or its global gas content. The host galaxies of type 1 AGNs, including those luminous enough to qualify as quasars, are generally gas-rich systems, possessing a cold interstellar medium reservoir at least as abundant as that in inactive galaxies of the same morphological type. This calls into question current implementations of AGN feedback in models of galaxy formation that predict strong cold gas depletion in unobscured AGNs. (Abridged)

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