Argus is a 16-pixel W-band focal plane array for millimeter spectroscopy that has been deployed on the Green Bank Telescope (GBT). The array is designed to operate in the 85-116 GHz range (Sieth et al. 2014, SPIE 9153; doi:10.1117/12.2055655 (pdf)). Argus is a collaboration between Stanford U. (PI Sarah Church), Caltech, JPL, Univ. Maryland, Univ. Miami, and the Green Bank Observatory (GBO).
Information for Argus Observers
Argus has successfully completed its initial phases of commissioning and is ready for shared-risk science observations on the GBT. The normal DSS scheduling system applies, and priority for observations will be given to teams that visit Green Bank to carry out the observations. Example Argus observing scripts are located at: /home/astro-util/projects/Argus/OBS while example Argus GBTIDL reduction scripts are located at: /home/astro-util/projects/Argus/PRO. The information contained here will expand significantly as it becomes available, but the details related to observing can wait until you visit Green Bank for observations.
- Argus Observing and Reference Guide (ascii)
- Argus User’s Guide (pdf presentation)
- GBT Observing Guide
- GBT Training Workshop Web page (includes some useful general information for non-experienced GBT observers).
- GBT Practical Information for Astronomers Page
Key Information for GBO call for proposals
- Proposers must contact the instrument team for permission to use the instrument; email address: “email@example.com”
- Good frequency range: 74–116 GHz
- Receiver noise: 40–80 K
- 4×4 element focal plane array with beam separation of 30.4 arcsec on the sky in both the elevation and cross-elevation directions.
- Single linear polarization per feed
- Instananous instrument bandwidth is 1.5 GHz (which is similar to the VEGAS spectrometer bandwidth)
- All 16 beams of ARGUS can be connected to the 16 VEGAS channels (VEGAS has 8 dual polarization banks [16 spectrometer channels])
- Users can observe multiple lines simultaneously using VEGAS sub-banding modes (http://www.gb.nrao.edu/vegas/).
- Double-side-band instrument with IQ-mixer scheme to separate the USB and LSB. The user can select one of the side-bands to connect with VEGAS. Sideband isolation is about 10-20 dB.
- Instructions estimating the observing time needed for Argus using the GBT sensitivity and mapping calculators (example of time estimation).
- NRAO Proposal Submission Tool (PST)
- GBT Sensitivity Calculator
- GBT Mapping Planner
- GBT Proposer’s Guide