CARA Science:
Submillimeter Research: Figures

Figure 1

Observations of the Eta Carina Complex obtained with the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO) located at the South Pole. The AST/RO telescope studies the interaction between structures in the Galaxy and the processes in interstellar gas which give rise to star formation. Surrounding the unusual young star Eta Carina is a region where the perturbing effect of a spiral arm is laid out across the line of sight. Here the tangent point of the Carina spiral arm was observed in submillimeter-wave transitions of carbon monoxide (CO J = 4 to 3, contour units 5 K km/s) and atomic carbon ([CI] P - P color scale units K km/s) with AST/RO in 1998. The spectra have been integrated over a velocity range -50 km/s to -9 km/s to show total line brightness. The [CI] and CO lines show the effects of cloud assembly, heating, and disruption as a function of spiral arm phase. The spiral density wave shock associated with the Carina arm crossing may be playing an important role in the formation and dissociation of the cloud complex, as well as in maintaining the internal energy balance of the clouds. Massive stars form at the densest regions of the molecular cloud complex. The winds and outflows associated with these stars have a disrupting effect on the complex and inject mechanical energy into the parent clouds, while massive young stars heat the parent clouds with UV radiation. The AST/RO data suggest, however, that massive stars alone may not account for the energetics of the clouds in the Carina region or their chemistry. The details of the data and the correlation among the various data sets hint at the possible role that the spiral density wave plays in feeding interstellar turbulence. This research is published by Zhang et al. 1999.

Figure 2

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The South Pole Imaging Fabry-Perot Interferometer (SPIFI) mounted on the right Nasmyth focus of the James Clark Maxwell Telescope (JCMT) near the 4200 m summit of Mauna Kea, HI, during a successful commissioning run.

Figure 3

A schematic showing the mounting of SPIFI on the CARA AST/RO telescope. SPIFI was installed on AST/RO to test the mount in January 1999 although no astronomical observation were made at that time. Astronomical testing was made on the JCMT telescope. With the success of the JCMT observations, SPIFI is on schedule to be deployed on the AST/RO telescope in December 2000.

Figure 4

CARA winter-over scientists receive training on how to operate the Submillimeter Polarimeter for Antarctic Remote Observations (SPARO), the first sub-Kelvin detector system designed for use at the South Pole during the Antarctic winter. From left to right: winter-over Greg Griffin, Northwestern graduate student David Chuss, and winter-over John Davis. Greg Griffin is turning a knob on SPARO which is mounted to the Viper telescope. SPARO observations will reveal the configuration of the magnetic field within our Galaxy's nucleus.