Other
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.460..159m&link_type=abstract
The Promise of the Herschel Space Observatory. Eds. G.L. Pilbratt, J. Cernicharo, A.M. Heras, T. Prusti, & R. Harris. ESA-SP 460
Other
Galaxies: Ngc1569 Ngc1140 Iizw40 Pdrs Cii Ism Dust
Scientific paper
The Herschel Space Observatory will offer the opportunity to study the gas and dust properties in dwarf galaxies of a wide variety of metallicities, even the extremely metal-poor galaxies, for the first time, using far infrared (FIR) and submillimeter (submm) wavelengths. The moderately metal-poor (1/10 < z < 1/2) galaxies that we have been studying to date in the FIR and submm using ISO and the KAO, exhibit striking effects on the observed gas and dust properties due to the low metallicity environments. These conditions may provide advantages in detecting more low metallicity dwarf galaxies in the local and the more distant universe. We find a striking enhancement of I[CII]/I(CO) in dwarf galaxies that can be explained by the lower dust abundance and conclude that FIR fine structure lines can be reliable probes of the molecular gas reservoir in dwarf galaxies. Additionally, the global dust properties differ from those of normal spiral galaxies or other starbursting galaxies. We find that most (up to 60%) of the global infrared luminosity is emitted from a small grain component which is the major contribution to the MIR continuum emission and is stochastically heated, while most of the dust mass resides in a very cold (~ 7K) component of dust, emitting in the submillimeter regime, not detected before now in galaxies. In spite of the striking dearth of the MIR aromatic band carriers, cooling in the photodissociation regions via [CII] is a very efficient process.
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