===================================================================== ==> in this proposal, more time is being requested for ggilmore.brwn_dwf ===================================================================== extended dark halos are well established around isolated unperturbed spiral galaxies, and may also exist around ellipticals. there is a close coincidence between the total mass in these spiral halos and the total baryonic mass in the universe, deduced from light element nucleosynthesis. thus, dark halos may be baryonic. the only forms for this dark baryonic matter which have not been excluded are brown dwarfs or very old, cool popiii white dwarfs. iso observations of edge-on spiral galaxy halos have (tentatively) detected excess 15micron emission, which may be associated with the dark matter, or may be unexpected popii gm stars. we will complement our lw3 data with 7micron data, to distinguish between these possibilities, and to confirm that the flux seen by isocam is truly associated with the galaxies. we will increase our sample to include a nearby, nearly edge-on dwarf spiral, which has the best-defined rotation curve of any galaxy, and is highly dark-matter dominated at all radii. the range in hubble types this provides will test the ubiquity of galaxy normal stellar halos as a viable option for the extended emission.
Instrument
CAM01
Temporal Coverage
1997-05-16T04:50:47Z/1997-08-07T13:07:43Z
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, GILMORE et al., 1999, 'ISO COLOURS OF THE HALOS OF NORMAL GALAXIES CONFIRMATION AND ORIGIN OF DETECTED HALO EMISSION', 1.0, European Space Agency, https://doi.org/10.5270/esa-zysqbua
