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Gain Stabilization of a Submillimeter SIS Heterodyne Receiver
James Battat, Raymond Blundell, Todd R. Hunter +3
We have designed a system to stabilize the gain of a submillimeter heterodyne receiver against thermal fluctuations of the mixing element. In the most sensitive heterodyne receiver…
Millimeter wave spectral line surveys and line mapping studies of NGC6334I and I(N)
S. Thorwirth, A. J. Walsh, F. Wyrowski +8
NGC6334I and I(N) have been observed with the Swedish-ESO Submillimetre Telescope, SEST, at wavelengths of 3, 2, and 1.3 mm. Especially NGC6334 I shows rich emission from many diff…
The distribution of H13CN in the circumstellar envelope around IRC+10216
F. L. Schoeier, D. Fong, J. H. Bieging +3
H13CN J=8-7 sub-millimetre line emission produced in the circumstellar envelope around the extreme carbon star IRC+10216 has been imaged at sub-arcsecond angular resolution using t…
High Spatial Resolution Observations of Two Young Protostars in the R Corona Australis Region
Christopher E. Groppi, Todd R. Hunter, Raymond Blundell +1
We present multi-wavelength, high spatial resolution imaging of the IRS 7 region in the R Corona Australis molecular cloud. Our observations include 1.1 mm continuum and HCO^+ J =…
The 10^5Lsun High-Mass Protostellar Object IRAS23151+5912
H. Beuther, Q. Zhang, T. R. Hunter +2
While most sources above 10^5Lsun have already formed an Ultracompact HII region (UCHII), this is not necessarily the case for sources of lower luminosity. Characterizing sources i…
A Jet-like Outflow toward the High-Mass (Proto)stellar Object IRAS 18566+0408
Qizhou Zhang, T. K. Sridharan, Todd R. Hunter +3
We performed interferometric observations of a high-mass protostellar candidate IRAS 18566+0408 in the \nh3 (J,K)=(1,1), (2,2) and (3,3) inversion transitions, the SiO J=2-1 and HC…
658 GHz Vibrationally-Excited Water Masers with the Submillimeter Array
T. R. Hunter, K. H. Young, R. D. Christensen +1
Discovered in 1995 at the Caltech Submillimeter Observatory (CSO), the vibrationally-excited water maser line at 658 GHz (455 micron) is seen in oxygen-rich giant and supergiant st…
Phase Closure at 691 GHz using the Submillimeter Array
T. R. Hunter, A. E. T. Schinckel, A. B. Peck +6
Phase closure at 682 GHz and 691 GHz was first achieved using three antennas of the Submillimeter Array (SMA) interferometer located on Mauna Kea, Hawaii. Initially, phase closure…
Characterization of Instrumental Phase Stability
D. Y. Kubo, T. R. Hunter, R. D. Christensen +1
Atmospheric water vapor causes significant undesired phase fluctuations for the Submillimeter Array (SMA) interferometer, particularly in its highest frequency observing band of 69…
IRAS 18317-0757: A Cluster of Embedded Massive Stars and Protostars
T. R. Hunter, Q. Zhang, T. K. Sridharan
We present high-resolution, multiwavelength continuum and molecular-line images of the massive star forming region IRAS 18317-0757. The IR through mm spectral energy distribution c…
Evidence for a Massive Protocluster in S255N
C. J. Cyganowski, C. L. Brogan, T. R. Hunter
S255N is a luminous far-infrared source that contains many indications of active star formation but lacks a prominent near-infrared stellar cluster. We present mid-infrared through…
Dust and gas emission in the prototypical hot core G29.96-0.02 at sub-arcsecond resolution
H. Beuther, Q. Zhang, E. A. Bergin +3
Aiming at a better understand of the physical and chemical processes in the hot molecular core stage of high-mass star formation, we observed the prototypical hot core G29.96-0.02…
Arcsecond Scale Kinematic and Chemical Complexity in Cepheus A-East
C. L. Brogan, C. J. Chandler, T. R. Hunter +2
We present results from SMA observations of the star forming region Cepheus A-East at ~340 GHz (875 micron) with 0.7'' - 2'' resolution. At least four compact submm continuum sourc…