Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999alma.confe..65v&link_type=abstract
Science with the Atacama Large Millimeter Array (ALMA), Associated Universities, Inc., held October 6-8, 1999 at Carnegie Instit
Physics
Radio, Recombination Lines, Rrl, Gas, High Density Regions, Starburst, Nuclei, Star Formation, Galaxies
Scientific paper
The observation of radio recombination lines (RRL) over a wide range of quantum levels gives valuable information on the physical state of the ionized gas. With the sensitivity of the existing radiotelescopes, at long as well as at short wavelengths, only less than 10 galaxies have been detected. The most distant galaxy detected so far is the starburst galaxy Arp 220. The remarkable feature in observing millimeter RRLs is that they allow to probe high density regions although this represent only a small fraction of the total mass of ionized gas. Starburst nuclei are heavily obscured in the visible but also in the near infrared, RRLs offer probably the unique tool to measure recent star formation rate (SFR). Centimeter lines can be used to determine the average SFR on a time scale of ~ 5 106 years while the millimeter lines offer the access to the very instantaneous SFR rate ( ~105 years). The total infrared luminosity is related to the average SFR on longer time scales, a few 107 years. Hence a multi-wavelength approach gives informations about the star formation history. Some recent results are presented. They illustrate the potentiality of ALMA which will have the sensitivity to detect a large number of galaxies and at much larger distances.
Anantharamiah K. R.
Viallefond Francois
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