the purpose of this proposal is to probe into the origin of a number of protostellar candidates isolated from molecular clouds. these sources were selected from the iras point source catalog as candidates for protostars, and their anti-correlation with molecular materials was found through a comparison of the iras data with our 13co(j=1-0) map obtained for a search for molecular clouds in the cygnus region (80<l<104, -7.5<b<10.5 deg). at least in this region, the isolated sources are, to our surprise, majority of protostellar candidates, occupying virgul70% of all the iras point sources selected as candidates for protostars. this may indicate that very compact clouds which might escape detection in our previous 13co survey are playing a leading role of star formation in our galaxy. on the other hand, these objects might be other astronomical objects such as galaxies or planetary nebulae, although most of their optical counterparts are absent on the palomar sky survey prints. nothing but the iras data is available for these sources at the moment, and all what is known about them is that they are accompanied by cold dust without apparent connection to molecular clouds. using sensitive cam equipped with iso, we propose to make deep imaging of the isolated protostellar candidates around 10 micron in order to investigate the distribution of the dust emission around them. we also propose to determine their spectra at far infrared wavelengths of 160 and 200 micron with isophot in order to estimate the dust temperature precisely. these data from iso are indespensible in order to investigate the properties of dust associated with these objects,which may give us a hint for their origin. all the observations can be carried out only by iso, since we cannot access to those wavelengths from the ground-based observations.
Instrument
PHT22
Temporal Coverage
1996-05-28T05:32:19Z/1996-08-05T23:06:05Z
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, Infrared Properties Of Yso Candidates Isolated From Molecular Clouds Ir Observations Of The Isolated Iras Point Sources With Iso, 1.0, European Space Agency, https://doi.org/10.5270/esa-6npelr3
