core JCMT 18354-0649S

We have successfully submitted our paper entitled “Supersonic turbulence in the cold massive core JCMT 18354-0649S” into MNRAS. The paper is leaded by our former PhD student and now Dr. Patrick Carolan. Paper includes radio-line observations of this particular core taken at the JCMT and MOPRA. The results were then fitted by the 3D non-LTE radiative transfer code by Eric Keto.

Here is a quote from the Abstract:

In this example of a cold massive core, JCMT 18354-0649S, a possible high mass analogue to a low mass star forming core is studied. Line and continuum observations from JCMT, Mopra Telescope and Spitzer are presented and modelled in detail using a 3D molecular line radiative transfer code. In almost every way JCMT 18354-0649S, is a scaled-up version of a typical low mass core with similar temperatures, chemical abundances and densities. The difference is that both the infall velocity and the turbulent width of the line profiles are an order of magnitude larger. While the higher infall velocity is expected due to the large mass of JCMT 18354-0649S, we suggest that this highly supersonic turbulence is best understood as being due to a large population of clumps embedded in a more tenuous medium. Many of these clumps will eventually undergo gravitational collapse to form individual low mass stars in a cluster around the massive stars.

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JCMT ACSIS Data

I’ve been trying to make presentable cubes for our observations of Wu Core done at JCMT with ACSIS. So far I’ve managed to produce nice, smooth cubes of data from HCN (3-2), HCO+(3-2) and C17O data (all the current dataset).

Please note that these steps are presented for an example and need not to be fully followed. Almost all of the parameters in each step are quite subjective and are done to satisfy my taste.

There is more extensive document located here: http://www.jach.hawaii.edu/JCMT/spectral_line/data_reduction/acsisdr/ 

Here is the sequence to produce the final cubes using STARLINK packages SMURF, KAPPA: Continue reading JCMT ACSIS Data