An unbiased spectral line survey observation toward the low-mass
  star-forming region L1527
  An unbiased spectral line survey toward a solar-type Class 0/I protostar,
IRAS04368+2557, in L1527 has been carried out in the 3 mm band with the
Nobeyama 45 m telescope. L1527 is known as a warm carbon-chain chemistry (WCCC)
source, which harbors abundant unsaturated organic species such as C$_n$H ($n =
3,\ 4,\ 5,\ldots$) in a warm and dense region near the protostar. The
observation covers the frequency range from 80 to 116 GHz. A supplementary
observation has also been conducted in the 70 GHz band to observe fundamental
transitions of deuterated species. In total, 69 molecular species are
identified, among which 27 species are carbon-chain species and their isomers,
including their minor isotopologues. This spectral line survey provides us with
a good template of the chemical composition of the WCCC source.
