Astronomical Research with the Owens Valley Millimeter Array

AST 96 - 13717。加州理工学院。该奖项支持加州理工学院欧文斯谷毫米波阵列的研究、技术发展和学生教育。该阵列由6个直径10.4米的精密天线组成，目前可以定位到南北220米和东西200米的最大间距。所有望远镜都配备了双通道（2.6和1.3毫米）低温si接收器。在较短的波长下，阵列所能达到的最高角分辨率为0.7角秒。目前，大约50%的观测时间是由非加州理工学院的天文学家进行的。在过去三年的资助期间，欧文斯谷阵列已经获得了从彗星到演化恒星外壳，到银河系恒星形成区域，以及其他星系的旋臂和活动核的分子发射的孔径合成图像。该阵列还被广泛用于研究活动星系核、星暴和高红移的超亮星系。在上次拨款期间，天文台还取得了若干技术进步，包括发展在1毫米和3毫米同时观测的能力，将连续带宽增加一倍至2千兆赫，并安装自动调谐和全LO覆盖。还设计了一个补偿大气相位波动的主动系统，并开始安装。在未来三年的拨款期内，天文台的科学计划将继续包括高红移河外系统、原恒星和恒星形成区域及其相关的原行星状星云、银河系的结构、年轻恒星的准直流出物、星际化学和各种太阳系物体的研究。

AST 96-13717. California Institute of Technology. PI: N. Z. Scoville Astronomical Research with the Owens Valley Millimeter Array This award supports research, technological development and student education at the California Institute of Technology's Owens Valley millimeter array. The array is made up of 6 precision 10.4m-diameter antennas, which currently can be positioned out to maximum spacings of 220m north-south and 200m east-west. All the telescopes are equipped with dual-channel (2.6 and 1.3mm) cryogenic SiS receivers. At the shorter wavelength, the highest angular resolution attainable by the array is 0.7 arcseconds. Approximately 50% of the array's observing time is presently devoted to investigations by non-Caltech astronomers. During the tenure of the past three year grant, the Owens Valley array has obtained aperture synthesis images of molecular emission in domains ranging from comets to the envelopes of evolved stars, to star-forming regions in the Galaxy, as well as the spiral arms and active nuclei of other galaxies. The array has also been used for extensive studies of active galactic nuclei, starburst and ultraluminous galaxies at high redshifts. During the last grant period, the observatory also made a number of technical advances, including the development of the ability to observe simultaneously at 1 and 3mm, doubling the continuum bandwidth to 2 GHz, and installing automated tuning and full LO coverage. An active system to compensate for atmospheric phase fluctuations was also designed and installation begun. In the next three year grant period the observatory's scientific programs will continue to include studies of high redshift extragalactic systems, protostars and star- forming regions and their associated protoplanetary nebulae, the structure of the Milky Way Galaxy, collimated outflows from young stars, interstellar chemistry and a variety of solar system objects.