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;
Argus is a collaboration between Stanford U. (PI Sarah Church),
Caltech, JPL, Univ. Maryland, Univ. Miami, and the Green Bank
Important Data Issue
All Argus data collected before 2018.10.22 19:30 UT will need to swap
the positional information between Beam-2 and Beam-3 to be consistent
with the actual positions on the sky for these beams. This was due to
a cable mis-match for these beams in the equipment
room. (link for more information)
Note: Beam2 and Beam3 are for the instrument beam numbering system
(1-16). This corresponding to fdnum1 and fdnum2 using GBTIDL
numbering system (0-15).
Information for Argus Observers
Argus has successfully completed its commissioning and has been
carrying out science observations on the GBT since 2017. 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.
VEGAS is the new GBT spectrometer and supports several modes. Here we
show the VEGAS bandpass performance as a function of bandwidth/mode
for Argus. The bandpass shapes shown here are similar to those seen
with other GBT receivers. The narrow-bandwidth modes (11-24 MHz) have
a smoother bandpass and are good for frequency switching, while the
larger bandwidth modes (100-1500 MHz) show signficant
ripples/structure across the bandpass.