Magellanic Cloud HI emission spectra
This utility plots HI emission spectra from recent
Compact Array and
Parkes
HI surveys of the
Small Magellanic Cloud (centred on 0101-7256,
with 4.5
ox4.5
o coverage) and the
Large Magellanic Cloud (0520-6844, with
a 10
ox12
o coverage).
Screen plots, postscript files and ascii dumps
are supported. When the data are used in a publication, please mention
the ATNF
publication byline
and reference the appropriate papers
(
Staveley-Smith et al 1997
for the SMC ATCA-only data;
Stanimirovic et al. 1998
for the SMC ATCA+Parkes data;
Kim et al. 1998
for the LMC ATCA-only data; and
Staveley-Smith et al. 2003 and
Kim et al. 2003
for the LMC ATCA+Parkes data). All spectra are presented in units of
brightness temperature (Kelvin). HI column density in atoms/sq.cm is
calculated by summing the temperature values over the velocity range of
interest and multiplying by 1.65 x 1.823E18. The velocity spacing in all
datasets is 1.65 km/s.
The ATCA-only
datasets are generally not recommended as they are insensitive to
structures larger than about 0.6 deg, and
cannot be used for any purposes where absolute column densities are
required. Negative flux in ATCA-only spectra is usually caused by sidelobes,
not absorption.
