Abstract / Description of output
We have modelled the spectral energy distributions of the 13 Hubble Deep
Field (HDF) galaxies reliably detected by the Infrared Space Observatory
(ISO). For two galaxies the emission detected by ISO is consistent with
being starlight or the infrared `cirrus' in the galaxies. For the
remaining 11 galaxies there is a clear mid-infrared excess, which we
interpret as emission from dust associated with a strong starburst. 10
of these galaxies are spirals or interacting pairs, while the remaining
one is an elliptical with a prominent nucleus and broad emission lines.
We give a new discussion of how the star formation rate can be deduced
from the far-infrared luminosity, and derive star formation rates for
these galaxies of 8-1000phi Msolar yr^-1, where phi takes account of the
uncertainty in the initial mass function. The HDF galaxies detected by
ISO are clearly forming stars at a prodigious rate compared with nearby
normal galaxies. We discuss the implications of our detections for the
history of star and heavy element formation in the Universe. Although
uncertainties in the calibration, reliability of source detection,
associations and starburst models remain, it is clear that dust plays an
important role in star formation out to redshift 1 at least.
Original language | English |
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Pages (from-to) | 490-496 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 289 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Aug 1997 |
Keywords / Materials (for Non-textual outputs)
- STARS: FORMATION
- GALAXIES: EVOLUTION
- GALAXIES: STARBURST
- COSMOLOGY: OBSERVATIONS
- INFRARED: GALAXIES