Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A photoionized accretion disk around a young high-mass star   We present high spatial resolution ($52$ au) observations of the high-mass
young stellar object (HMYSO) G345.4938+01.4677 made using the Atacama Large
Millimeter/sub-millimeter Array (ALMA). This O-type HMYSO is located at 2.38
kpc and it is associated with a luminosity of $1.5\times10^5 L_\odot$. We
detect circumstellar emission from the H$38\beta$ hydrogen recombination line
showing a compact structure rotating perpendicularly to the previously detected
radio jet. We interpret this emission as tracing a photo-ionized accretion disk
around the HMYSO. While this disk-like structure seems currently too small to
sustain continued accretion, the data present direct observational evidence of
how disks can effectively survive the photo-ionization feedback from young
high-mass stars. We also report the detection of a low-mass young stellar
object in the vicinity of the HMYSO and suggest that it forms a high-mass and
low-mass star binary system.

14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
2
The categories of this paper are: math