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- W20044124 abstract "We report on the status of our longterm project aimed at characterising the nature of a new population of galaxies that has emerged from various ISOCAM surveys1. In September 1999, we used ISAAC on UT1 and under very good seeing conditions over two nights we obtained the first neari n f r a r e d spectra for a sample of ISOCAM galaxies drawn from a deep ISO survey of the Hubble Deep Field South. The Hα emission line was detected in 11 out of the 12 galaxies we looked at, down to a flux limit of 7 × 10–17 erg cm–2 s–1, corresponding to a line luminosity of 1041 erg s–1 at z = 0.6 (for an H0 = 50 and Ω = 0.3 cosmology). The rest frame R-band spectra of the ISOCAM galaxies we observed resemble those of powerful dust-enshrouded starbursts. The sample galaxies are part of a new population of optically faint, but infrared luminous starburst galaxies. T h e s e galaxies are also characterised by an extremely high rate of evolution with redshift up to z ~ 1.5 and significantly contribute to the cosmic far-IR extragalactic background. 1. New Facts from Deep Sky Explorations at Long Wa v e l e n g t h s Observations at wavelengths longer than a few μm are essential to study diffuse media in galaxies, including all kinds of atomic, ionic and molecular gases and dust grains. By definition, they are particularly suited to investigate the early phases in galaxy evolution, when a very rich ISM is present in the forming systems. Unfortunately, the IR and sub-millimetre constitute a very difficult domain to access: astronomical observations are only possible from space, apart from a few noisy atmospheric windows at λ ~ 10 and 850 μm where they can be done from dry sites on the ground. 1.1 Discovery of the Cosmic" @default.
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- W20044124 date "2000-06-01" @default.
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- W20044124 title "ISAAC on the VLT investigates the nature of the high-redshift sources of the cosmic infrared background." @default.
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