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Source
Figure 5.1:
The Source panel in the Field Setup form of the Science Goal.
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- Source Name: The source name. The source names should only contain the following characters: a-z, A-Z, 0-9, -,+, _ or a . (full stop). Characters other than these will be removed or replaced when the project is validated. Clicking on ``Resolve'' will search for this source using either the SIMBAD or NED servers and will fill in the source properties if a match is found. Check the details very carefully!
- Resolve: Query the servers using the entered source name.
- Choose a Solar System Object: A number of solar system objects are recognised by the telescope control system and can be selected here. It is also possible to enter an ephemeris for any non-sidereal source.
- Name of Object Recognised objects are:
- Stars: The Sun.
- Planets: Mercury, Venus, Mars, Jupiter, Saturn, Uranus,
Neptune.
- Satellites: The Moon, Ganymede, Callisto, Io, Titan.
- Dwarf planets: Pluto, Ceres.
- Asteroids: Pallas, Juno and Vesta.
- Ephemeris: Load a JPL HORIZONS format ephemeris.
- Source Coordinates: Includes the system - J2000 should be
chosen.
- RA: Source Right Ascension.
- DEC: Source Declination.
- Parallax: Source parallax.
- PM RA: Proper motion in the R.A. (cross-declination) direction. Units should be milliarcsec/yr. Proper motions are used to calculate the current source position assuming that the J2000 position refers to Epoch J2000.
- PM DEC: Proper motion in the declination direction; Units should be milliarcsec/yr.
- Source Radial Velocity:
The radial velocity of the source can be entered as either a velocity or a redshift. It is used to convert source rest-frame frequencies to their observable (sky) equivalents. The full set of options are:
- Velocity: Upon entering this, the redshift will also be set according to the Doppler Type (velocity definition). For Single Continuum setups, automatic SB generation will set the velocity to zero (in the SB only).
- Doppler Frame: A number of options are available: barycentric, lsrk, topocentric and lsr. However, heliocentric should not be chosen as it is not currently supported. Resolving the source details will often cause heliocentric to be set and, if this is the case, automatic generation will convert it to barycentric (these differ by a maximum of approximately 12 m/s). If the frame is changed, no conversion is performed of an already-entered velocity/redshift.
- z: Redshift. Upon entering this, the velocity will also be set according to the Doppler Type (velocity definition). For Single Continuum setups, automatic SB generation will set the redshift to zero (in the SB only).
- Doppler Type: This sets the velocity definition (radio, optical or relativistic). Changing this will make the velocity agree with the entered redshift.
- Target Type: The supported observing patterns: ``Multiple pointings'' and ``1 rectangular field''. Only one source per Science Goal is allowed if a rectangular field is defined.
Next: Expected Source Properties
Up: Field Setup
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The ALMA OT Team, 2013 Feb 27