Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interstellar atoms, molecules and diffuse bands toward SN2006X in M100   Aims. Supernovae offer the unique possibility to probe diffuse extra-galactic
sightlines via observation of the optical transitions of atoms, molecules and
the diffuse interstellar bands (DIBs). Through optical spectroscopy the
presence of (complex) molecules in distant galaxies can be established.
  Methods. High resolution optical (3300 -- 6800 Angstrom) spectra of SN2006X
at different phase obtained with UVES on the VLT were reduced and analysed.
  Results. In addition to previously detected atomic (NaI and CaII) and
molecular (CN) transitions we present detections of DIBs (6196, 6283 Angstrom),
diatomic molecules (CH, CH+) and neutral atoms (CaI) in the spectra of SN2006X
taken at different phases (at 2 days before and 14 and 61 days after the
brightness maximum). An analysis of the absorption profiles shows no variation
between phases in the abundance, nor the central velocities (within 3-sigma
error bars) of the (dense) gas tracers (CH, CH+ and CaI) and the DIBs. This is
consistent with the conclusion in the literature that SN2006X exploded behind a
dense interstellar cloud (inferred from strong atomic sodium and calcium lines
and CN transitions) which caused strong photometric reddening but whose
material was not directly affected by the supernova explosion. The CH and CN
column densities correspond to a reddening of one magnitude following the
Galactic correlation derived previously. The 6196 and 6283 lines detected in
the M100 ISM are under-abundant by factor of 2.5 to 3.5 (assuming a visual
extinction of ~2 mag) compared to the average Galactic ISM relationship. Upper
limits for 6379 and 6613 DIBs show that these are at least a factor of seven
weaker. Therefore, the Galactic DIB-reddening relation does not seem to hold in
M100, although the lower gas-to-dust ratio may further reduce this discrepancy.

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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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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: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: math
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th