干旱区生态环境知识资源中心

Wide differences between the positional and photometric quality of astronomical data sets requires visual examination for accurate cross-identifications of sources between data sets. Given the tedium involved in these comparisons, astronomers need methods to perform rapid cross-comparisons. The On-Line Science Information Services (OASIS), a Java toolkit recently released by the IPAC Infrared Science Archive (IRSA), provides such capability. OASIS is a collection of services, designed to be run independently of each other, that access and integrate multiple image and catalog archives. Its first release provides access to IRAS, 2MASS, MSX, FIRST, and NVSS images, and is interoperable with NED and CDS. We describe its applicability to two projects that require bulk visual cross-identification: the NStars database, which serves quality controlled data for all stellar, substellar, and planetary objects within 25 parsecs of the Sun; and identification of far-IR counterparts of 750 active galaxies measured by ROSAT.