Additional Information

In addition to specifying a position and possible velocity needed to track a source, some extra reference information may be specified for this catalog entry. These items however are not necessary for the observation and are provided for your own reference.

 

Source Brightness:

With FILE - CREATE NEW - SOURCE BRIGHTNESS you are asked which type of brightness distribution you want to add to your source properties. For unresolved (point-like) sources you would probably choose type Point, and fill out the Flux Density at some Frequency Range. A slightly resolved source perhaps would be better described by a Gaussian model with a Major Axis and Minor Axis Diameter at some Position Angle. Planets also use the Limb Darkening property of the Disk models. You can specify more than one brightness model for a source, or provide a FITS image or clean-components model file.

 

Image Links:

If you want to keep a catalog of image URL links, e.g., to the images in the VLA archive, use FILE - CREATE NEW - SOURCE IMAGE LINK as many times as desired.

 

Notes:

This tab-page is where you can collect all other information you wish to attach to this source. For example, for a target source you can remind yourself of the nearby calibrators you have found to be useful at some frequency, a reference to a paper mentioning an alternate position or a source property, or anything else you want to note. Click the blue expand button or New Note to add information to the Notes field. You can, e.g., also add links to papers or any other URLs for that matter. User defined values can be added at the bottom, e.g., the UV-range you determined to be proper for a point source calibration model, the color of its eyes, etc; whatever you deem useful.

When you are happy with your (re)sources, at any time you can save the changes you made. At this point it would be a good time: FILE - SAVE ALL.

Connect with NRAO

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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.

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