Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature, Mass and Turbulence: A Spatially Resolved Multi-Band
  Non-LTE Analysis of CS in TW~Hya   Observations of multiple rotational transitions from a single molecule allow
for unparalleled constraints on the physical conditions of the emitting region.
We present an analysis of CS in TW~Hya using the $J=7-6$, $5-4$ and $3-2$
transitions imaged at $\sim 0.5^{\prime\prime}$ spatial resolution, resulting
in a temperature and column density profile of the CS emission region extending
out to 230~au, far beyond previous measurements. In addition, the 15~kHz
resolution of the observations and the ability to directly estimate the
temperature of the CS emitting gas, allow for one of the most sensitive
searches for turbulent broadening in a disk to date. Limits of $v_{\rm turb}
\lesssim 0.1 c_s$ can be placed across the entire radius of the disk. We are
able to place strict limits of the local H$_2$ density due to the collisional
excitations of the observed transitions. From these we find that a minimum disk
mass of $3 \times 10^{-4}~M_{\rm sun}$ is required to be consistent with the CS
excitation conditions and can uniquely constrain the gas surface density
profile in the outer disk.

23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn