Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-light images from low dispersion spectrograph-cum-imager on
  3.6-meter Devasthal Optical Telescope   A low dispersion spectrograph-cum-imager has been developed and assembled in
ARIES, Nainital. The optical design of the spectrograph consists of a
collimator and a focal reducer converting the f/9 beam from the 3.6-m Devasthal
optical telescope to a nearly f/4.3 beam. The instrument is capable of carrying
out broad-band imaging, narrow-band imaging and low-resolution
({\lambda}/{\Delta}{\lambda}<2000) slit spectroscopy in the wavelength range
350-1050 nm. A closed-cycle cryogenically cooled charge-coupled device camera,
also assembled in ARIES, is used as the main imaging device for the
spectrograph. The first images from the spectrograph on the telescope assert
seeing-limited performance free from any significant optical aberration. An
i-band image of the galaxy cluster Abell 370 made using the spectrograph shows
faint sources down to ~25 mag. The quality and sensitivity of the optical
spectrums of the celestial sources obtained from the spectrograph are as per
the expectations from a 3.6-m telescope. Several new modes of observations such
as polarimetry, fast-imaging, and monitoring of the atmospheric parameters are
being included in the spectrograph. Using a test setup, single optical pulses
from the Crab pulsar were detected from the telescope. The spectrograph is one
of the main back-end instruments on the 3.6-m telescope for high sensitivity
observations of celestial objects.

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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: hep-ph