we propose to use iso-sws & lws in their fabry-perot modes to observe the h2 and hd pure rotational lines at 28.2 and 112.1 um due to cold (ground-state) molecular hydrogen in the plane of our galaxy, as seen in absorption against strong iras sources. these transitions must be observed from space, and iso is the only current or future mission with adequate capabilities. the combination of choice background-sources with an optimum observing strategy will yield the most sensitive search iso is capable of. the resulting data will significantly constrain the relation between the cold molecular component and the dark matter required by dynamical studies of spiral and irregular galaxies.
Instrument
SWS02 , SWS07
Temporal Coverage
1997-02-01T21:01:53Z/1997-10-03T19:30:58Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, KOORNNEEF et al., 1999, 'SEARCH FOR COLD MOLECULAR HYDROGEN IN THE GALAXY', 1.0, European Space Agency, https://doi.org/10.5270/esa-7vuebgd
