Astronomical Research with the Owens Valley Millimeter Array

使用欧文斯谷毫米波阵列进行天文研究

• 批准号: 9314079
• 负责人: Nicholas Scoville
• 金额: $ 493万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-11-01 至 1996-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9314079&HistoricalAwards=false
• 关键词: Astronomical; Research; Owens; Valley; Millimeter

AST-9314079. 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 1 arcsecond. 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 the envelopes of evolved stars, to star- forming regions in the Galaxy, as well as the spiral arms and active nuclei of other galaxies; carbon monoxide emission has been detected in high redshift quasars and ultraluminous galaxies at redshifts as high as 3.2. During the last grant period, the observatory also made a number of technical advances, including the construction and placement in service of 3 additional antennas, installation of new beam transport optics, implementation of fully remote receiver tuning capability, construction of a new digital correlator and fiber-optic transmission and delay line system. In the next three year grant period the observatory's scientific programs will include studies of high-redshift galaxies and protogalaxies, infrared-luminous galaxies, the large-scale structure of the Universe, protostars and protoplanetary nebulae, the structure of the Milky Way Galaxy, collimated outflows from young stars, interstellar chemistry and a variety of solar system objects. Planned technical developments in the 1994-1997 period include the intr oduction of sideband separation receivers with integrated first-stage IF amplifiers, doubling the interferometer baseline, introduction of a second continuum channel for each baseline, and the development and testing of low-noise stable radiometers on each telescope to measure and compensate for short- term atmospheric fluctuations in phase which reduce the sensitivity of the array, particularly over large baselines.

AST-9314079。加州理工学院。 PI：N. Z. Scoville 天文研究与欧文斯谷毫米波阵 该奖项支持加州理工学院欧文斯谷毫米波阵的研究、技术开发和学生教育。该阵列由 6 根直径为 10.4m 的精密天线组成，目前最大的南北间距为 220m，东西间距为 200m。所有望远镜均配备双通道（2.6 和 1.3mm）低温 SiS 接收器。在较短的波长下，阵列可达到的最高角分辨率为 1 弧秒。 该阵列大约 50% 的观测时间目前用于非加州理工学院天文学家的研究。 在过去三年的资助期内，欧文斯谷阵列获得了分子发射的孔径合成图像，其范围从演化恒星的包络线到银河系中的恒星形成区域，以及其他星系的旋臂和活动核；在红移高达 3.2 的高红移类星体和超发光星系中已检测到一氧化碳排放。在上一次拨款期间，天文台还取得了许多技术进步，包括建造和放置了3个额外的天线，安装新的波束传输光学器件，实现完全远程接收器调谐能力，建造新的数字相关器以及光纤传输和延迟线系统。在接下来的三年资助期内，天文台的科学项目将包括对高红移星系和原星系、红外发光星系、宇宙大尺度结构、原恒星和原行星状星云、银河系结构、年轻恒星的准直流出、星际化学和各种太阳系天体的研究。 1994-1997年期间计划的技术发展包括引入带有集成第一级中频放大器的边带分离接收器、加倍干涉仪基线、为每个基线引入第二个连续通道以及在每个望远镜上开发和测试低噪声稳定辐射计，以测量和补偿短期大气相位波动，这些波动降低了阵列的灵敏度，特别是在大范围内。 基线。