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Fig. 3


CH3OH averaged spectrum toward comet C/2002 T7 (LINEAR) acquired on 10.74 UT May 2004 with a total integration time of 240   min. The upper panel shows all the lines detected with the AOSA (thick blue line) and AOSB (thin red line) within a ~ 240   MHz range. The lower panel shows a close-up view corresponding to the frequency range of the shaded region in the upper panel covered with the AOSA (thick blue line), AOSB (thin red line), and the CTSB (black line). The CTSB spectrum was resampled to a 190 kHz resolution per channel with a rectangular window function to increase the S/N of the detected lines. The vertical axes are the calibrated main beam brightness temperatures and the lower sideband frequency is shown in the horizontal axes. Note that the AOSA backend has a channel with a spurious emission feature around 241.825 GHz in the upper panel. The rms noise level measured with respect to the zero reference level is shown by the blue, red, and gray bars on the right of the lower panel for AOSA, AOSB, and CTSB, respectively. Note that the rms in the CTSB spectrum was calculated for the native frequency resolution of 40 kHz.

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