=========================================================================== ==> time for this proposal is to be transferred from cbonoli.firbar(1-2) ==> this proposal requests an upgrade from priority 3 for cbonoli.firbar(1-2) =========================================================================== the proposal mentioned above (actually two parts of the same proposal), aimed at observating a sample of 13 barred galaxies with phot, has been assigned by otac 30000sec with priority 2 and 32400sec with priority 3. during phase 2 we used 27693sec of priority 2. here we want to performe a time upgrade of our priority 3 observations and and to recover the remaining 2307sec from priority 2. related observations in the guaranteed time (gt) with cam will provide fruitful information on the distribution of the warm dust inside hii regions and of the pahs emission. in the firbar proposal we suggest to further investigate the emission properties of these bright infrared sources looking at different wavelenghts to discriminate the temperatures of dust components. hydrodynamical studies show that the gravitational potential due to the presence of the bar exerts a torque which drives an inflow of the gas along the bar toward the center. in the presence of an inner lindblad resonance, this gas accumulates in a nuclear ring, where active star formation takes place. the conclusion is that bars are playing a major role in triggering star formation. it is therefore not surprising that analyses of starburst galaxy samples showed that there is a preponderance of bar features. following soifer (1987), barred galaxies are the most luminous infrared sources among normal galaxies; in fact, around 50% of their total luminosity is emitted at long wavelengths, while this percentage is about 30% for normal spirals. as suggested by previous works on this subject (mazzei et al, 1992, 1994), looking at suitables infrared spectral ranges, we can recover the current value, as well as the past trend of the star formation rate.
Instrument
PHT03 , PHT37 , PHT38 , PHT39
Temporal Coverage
1997-02-02T10:37:34Z/1997-12-16T21:48:58Z
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.
