1742-3005 (l,b -1.25, 0 deg) was discovered serendipitously by pht-p towards sgr e during a survey of large scale structure in the nuclear bulge (nb) between 3.6 and 200 um in feb. 1996 (program pmezger.pgmgalc). it.s nature is completely unknown. not seen in earlier ground- and balloon-based surveys, it could be variable, as it now outshines sgr a west at 3.6 um. a follow up pht-s spectrum taken on august 25th 1997 reveals a strange, rather flat nir/mir spectrum, unique for sources in the nb, extending longwards at least as far as a pht-p 25 um measurement. there is photometric evidence for extended emission on an angular scales of ca. 1 arcmin. lws upper limits imply a declining flux density with increasing wavelength longwards of 25 um. ir imaging and spectroscopy is needed to identify the energy source for 1742-3005. we propose (i) pht-c and isocam mapping to establish the structure and it.s dependence on wavelength; (ii) a full sws spectral scan to measure lines diagnostic of the heating source and to measure the spectral turn over of the continuum emission in the 25 - 40 um range, and (iii) a repeat of the initial pht-p measurements to search for variability over the duration of the iso mission. the requested tdt is 5.2 hr. two figures for this proposal are being sent by fax to the project scientist.
Instrument
SWS01
Temporal Coverage
1998-02-19T12:10:07Z/1998-02-19T13:07:41Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's 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, 1999, Imaging And Spectroscopy Of The Unusual Ir Source 1742-3005, 1.0, European Space Agency, https://doi.org/10.5270/esa-wwr14j7
