Hardware Setup and Doppler Tracking

The "hardware setup" column is very similar; it shows the hardware setup selected if a resource was previously assigned. Click "No Change" to select the exact resource setting of the preceding scan (it must be defined for that preceding scan of course). Click "Change" to get a familiar dialog box to select your resource catalog, resource group and resource from (only) the predefined resources in the RCT. Resources cannot be defined "on the fly". Also here it is useful to specify all hardware resources (and pointing scan setups) in this SB in a single resource catalog (group), but because resource catalogs typically are not as extensive as source catalogs it is less of a hassle if you don't.

Doppler tracking on resources with rest frequencies is currently disabled; see Appendix A! The next paragraph currently is for background information only.

Spectral line resources that were set up with a rest frequency instead of a fixed sky frequency have to be specified with an option for the Doppler tracking in a third table at the bottom of the page. Choices are to use the information in the source catalog for the source used in the scan (typically done if this is your target source scan), to use another source in any of your catalogs (typically one would choose the target source if this is your calibrator scan for that target), or you can specify another direction in the sky and another velocity to track. The recalculated sky frequencies for the starting time of the completed SB will show in the scan listing mentioned further down.

Connect with NRAO

The NSF National Radio Astronomy Observatory and NSF Green Bank Observatory are facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Founded in 1956, the NSF NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NSF NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NSF NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NSF NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.

The U.S. National Science Foundation (U.S. NSF) is an independent federal agency created by Congress in 1950 "to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense..."

AUI collaborates with the scientific community and research sponsors to plan, build, and operate cutting-edge facilities. We cultivate excellence, deliver value, enhance education, and engage the public.