Active Galactic Nuclei

活动星系核（AGN）是宇宙中最引人注目的组成部分之一--它们释放出惊人的能量（比一个明亮的星系多几个数量级），辐射出一个巨大的电磁波谱带（从无线电区域到硬X射线），有时会产生大量的相对论流，这些相对论流作为从中心延伸数百万光年的粒子射流出现。这个项目包括几个不同的项目。其中一组项目旨在确定不同类型活动星系核的能量来源。它们包括射电星系的中红外观测，以定位隐藏的活动星系核，可以通过它们的废热看到;在毫米光谱区域的测光，看看光学暗淡的射电星系是否没有隐藏的光学活动星系核;在毫米波段的测绘和光谱学，以识别引力透镜类星体。第二组项目涉及对附近和高红移活动星系核的自适应光学观测，包括各向同性选择的塞弗特样本，以及高红移类星体和射电星系的宿主信息。该项目的资金由NSF河外天文学宇宙学计划（AST/EXC）提供。

ABSTRACT AST 0098719AntonucciActive galactic nuclei, (AGN) are some of the most dramatic components of the Universe---they emit prodigious amounts of power (as much as several orders of magnitude more than a bright galaxy), radiate it over a tremendous swath of the electromagnetic spectrum (from the radio region to hard X-rays), and sometimes generate bulk relativistic flows which emerge as jets of particles stretching for millions of light years from their centers. This project covers several different projects. One set of projects is directed at determining the energy source in different types of AGN. They include mid-infrared observations of radio galaxies, to locate hidden AGN which can be seen by their waste heat; photometry in the millimeter spectral regions, to see if optically dull radio galaxies have no hidden optical AGN; and mapping and spectroscopy in the mm waveband, to identify gravitational lensed quasars. The second set of projects involves adaptive optics observations of nearby and high-redshift AGN, including an isotropically selected Seyfert sample, and high redshift quasars and radio galaxies for host information.Funding for this project was provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC).***