==> in this proposal, more time is being requested for khurley.sgrquies ==> this proposal requests an upgrade from priority 3 for khurley.sgrquies the 3 known soft gamma repeaters appear to be a completely new manifestation of neutron stars. sgr 1806-20 and sgr 1900+14 have highly unusual stellar counterparts, whose spectra peak in the far infrared, while they have not been detected at submillimeter or millimeter wavelengths. their infrared spectra appear to contain several components: the photospheric emission from star(s) dominates at shorter wavelengths, a bright point source dominates at 25 microns, while an extended source dominates at 60 microns. their far ir spectra are consistent with simple dust models. since our original iso proposal was written, we have carried out a multi-wavelength observing program and have found that sgr 1806-20 is orders of magnitude more luminous in the ir than originally suspected; indeed, it appears to be a luminous blue variable star, and perhaps the most luminous star in the galaxy. we have also found that sgr 1900+14 may have a peculiar double star system as its counterpart. our lws observation of this source has already been done, although we do not yet have the data. finally, we have not so far identified a mid-ir counterpart to sgr0525-66. therefore, we are requesting 1. that our lws01 priority 3 time on sgr 1806 be upgraded, 2. that our pht32 priority 3 time on sgr 1806 at 200 microns be upgraded 3. that our sws01 priority 3 time on sgr1900 and 1806 be upgraded, preferably with a higher speed to improve the s/n 4. that new pht32 observations be done on sgr1806-20 and 1900+14 at 60 microns to determine the extent of the sources 5. to upgrade the 25 micron raster pht03 on sgr0525 (from the spring launch proposal) 6. to upgrade our grade 1 25 micron pht03 observations for calibration of sws spectra. 7. to perform cam05 polarization measurements on sgr1900 and 1806.
Instrument
LWS01 , PHT03 , PHT32 , SWS01
Temporal Coverage
1997-03-19T21:19:46Z/1998-04-10T09:26:45Z
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, Kevin Hurley, 1999, 'STUDY OF SOFT GAMMA REPEATER COUNTERPARTS', 1.0, European Space Agency, https://doi.org/10.5270/esa-ysdnu93
