Collaborative Research: Submillimeter Studies of the Cosmological Star Formation and AGN Histories

AST-0084847 Barger，Amy J.宇宙学星星形成和活动星系核历史的亚毫米波研究这项工作的目标是分析最近在夏威夷15米詹姆斯·克拉克·麦克斯韦望远镜（JCMT）上使用亚毫米波公共用户测辐射热仪阵列（SCUBA）发现的关于尘埃遮蔽星星形成和高红移活动星系核活动的新信息。该项目的科学家们计划将他们的观测范围扩大到亚毫米波长下0.5至20 mJy通量范围内的星系计数。他们预计这些低通量源将构成远红外背景中看到的大部分光。他们将使用来自VLA的深厘米射电图和来自Chandra卫星的高分辨率硬X射线图像来确定这些遥远的，严重尘埃遮蔽的源的多波长特性。这些数据反过来将被用来识别物体，以便用凯克、斯巴鲁和双子座望远镜进行进一步的研究。这些研究集中在宇宙时间间隔内星系的性质上，当时我们今天看到的大多数恒星都在形成中。在形成的早期阶段，恒星被尘埃笼罩，这些尘埃阻挡了可见光。 然而，非常高能的电磁辐射，如X射线，或非常低能量的辐射，如亚毫米（远红外）或无线电波可以穿透尘埃，使我们能够“看到”恒星的形成。位于夏威夷15米JCMT的新开发的“SCUBA”探测器可用于探测非常微弱的亚毫米源，这些源可能是被尘埃笼罩的恒星（星爆），也可能是活动星系核（AGN），方法是利用星系团对微弱源进行“透镜”或增强亮度。通过将这些观测结果与X射线区的观测结果（来自钱德拉卫星）和射电区的其他观测结果（使用VLA）相结合，考伊和巴杰将能够从活动星系核中挑选出星暴，并确定这两种类型的活动对星系演化早期阶段的相对重要性。该项目的资金由美国国家科学基金会河外天文学宇宙学计划（AST/EXC）提供。

AST-0084847Barger, Amy J. Submillimeter Studies of the Cosmological Star Formation and AGN HistoriesThis work has as its goal the analysis of new information about the dust-obscured star formation and AGN activity at high-redshifts which was recently discovered with the Submillimeter Common User Bolometer Array (SCUBA) on the 15 m James Clark Maxwell Telescope (JCMT) in Hawaii. The project scientists plan to extend their observations to cover galaxy counts for sources in the flux range of 0.5 to 20 mJy at submillimeter wavelengths. They expect these low flux sources to comprise the bulk of the light seen in the far infrared background. They will use deep centimeter radio maps from the VLA and hi-resolution, hard x-ray images from the Chandra satellite to determine the multi-wavelength properties of these distant, heavily dust-obscured sources. This data in turn will be used to identify objects for further study with the Keck, Subaru, and Gemini telescopes.These studies focus on the properties of galaxies during an interval of cosmic time when most of the stars we see today were being formed. In the early stages of formation, stars are enshrouded in dust and this dust blocks visible light. However, very energetic electromagnetic radiation, such as X-rays, or very low energy radiation, such as submillimeter (far infrared) or radio waves can penetrate the dust and allow us to "see" the stars as they form. The newly developed "SCUBA" detector at the 15 m JCMT in Hawaii can be used to detect very faint submillimeter sources, which may be dust enshrouded stars (starbursts) or may be active galactic nuclei (AGNs), by using intervening clusters of galaxies to "lens", or enhance the brightness, of the faint sources. By combining these observations with ones in the X-ray region (from the Chandra satellite) and other observations in the radio region (using the VLA) Cowie and Barger will be able to sort out the starbursts from the AGNs and determine the relative importance of the two types of activity for galaxies in the early stages of evolution.Funding for this project was provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC).***