we propose to observe a sample of actively star forming dwarf galaxies, also known as hii galaxies, 70% of which have optical companions. the companions were initially detected by searching for neutral hydrogen and were subsequently identified with optical counterparts on r-band ccd frames. it is suggested that the companions have provided the trigger for the current burst of star formation. we plan to observe the hii galaxies, most of which have iras detections at 60 and 100 um, and to search for ir emission from the companion objects. our aim is to try to determine the dust masses in these objects and to determine their gas-to dust ratio (note that most of the detectable matter in these objects is in the gas phase, stars contributing less than 50%). as these objects are among the lowest abundance systems known, we.d like to find out if the dust characteristics, such as temperature correlates with metallicity and if dust influences the star formation threshold.
Instrument
PHT03 , PHT22 , PHT32
Temporal Coverage
1996-06-15T01:03:47Z/1997-12-02T01:41:36Z
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.
