Detailed Temperature Map of the Taurus Molecular Cloud

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The Taurus Molecular Cloud (TMC) provides us with a rich environment to study astrochemistry. We used data taken with the K Band Focal Plane Array (KFPA) on the Green Bank Telescope (GBT) to measure ammonia (NH3) (1-1) and (2-2) lines to produce a detailed temperature map of the cloud. The NH3 (2-2) line was below the noise level of the measurement and so we present only an upper limit temperature map. Much longer exposures of the cloud will be required to reveal the (2-2) line because of its extremely low temperature. We also created a procedure to detect linear molecules, such as the cyanopolynnes HC11N and HC13N, whose emission behavior is dependent on a rotational constant and a quartic centrifugal distortion constant. This procedure can scan over a range of values for these constants and would sum up all the regions in the spectra (i.e. 1-1, 2-2, etc.) in velocity space where the emissions lines would be and select out cases whose signal would add up to give a SNR greater than 3. This project used archived GBT data that had been combined to create much greater signal to noise ratio.

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