Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical polarimetry of HH 135/HH 136   We present optical linear polarimetry in the line of sight to HH135/HH136.
The polarimetry of the field stars reveals two populations: one corresponds to
a foreground interstellar component; the other originates in the interstellar
medium in the vicinity of the Herbig-Haro pair and, therefore, can be used to
study the magnetic field in the star forming region. Its direction is aligned
with the jet of HH135/HH136, which could be an indication that the interstellar
magnetic field is important in the outflow collimation. The interstellar
magnetic field magnitude was estimated to be of order 90 uG. According to
recent numerical simulations, an interstellar magnetic field of such strength
can be important in the definition of the outflow direction. There is also
evidence that the associated dark cloud has an elongation parallel to the
magnetic field. Our image polarimetry of the extended emission associated with
HH135/HH136 shows a centro-symmetric pattern pointing to the knot E of HH136.
Previous near infrared polarimetry traces a different illumination center,
namely IRAS 11101-5829 - the probable exciting source of the system. This
discrepancy can be explained if the YSO emission is completely blocked in
optical wavelengths and the dominant optical source in the region is the knot
E, whose nature is uncertain. A discussion of the spectral energy distributions
of HH136-E and IRAS 11101-5829 is presented.

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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat