Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Keck Adaptive Optics Observations of the Protostellar Disk around Radio
  Source I in the Orion Kleinmann-Low Nebula   We have made the first detection of a near-infrared counterpart associated
with the disk around Radio Source "I," a massive protostar in the Kleinmann-Low
Nebula in Orion using imaging with laser guide star adaptive optics on the Keck
II telescope. The infrared emission is evident in images acquired using L' (3.8
microns) and Ms (4.7 microns) filters and is not detectable at K' (2.1
microns). The observed morphology strongly suggests that we are seeing some
combination of scattered and thermal light emanating from the disk. The disk is
also manifest in the L'/Ms flux ratio image. We interpret the near-infrared
emission as the illuminated surface of a nearly edge-on disk, oriented so that
only the northern face is visible; the opposite surface remains hidden by the
disk. We do not see infrared radiation associated directly with the star
proposed to be associated with Source "I." The data also suggest that there is
a cavity above and below the disk that is oriented perpendicular to the disk,
and is sculpted by the known, strong outflow from the inner disk of Source I.
We compare our data to models of a protostar with a surrounding disk, envelope,
and wind-blown cavity in order to elucidate the nature of the disk around Radio
Source I.

13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci