Observations of the Hubble Deep Field with the Infrared Space Observatory - V. Spectral energy distributions, starburst models and star formation history

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 gal...

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Detalles Bibliográficos
Autores: Rowan-Robinson, Michael, Mann, Robert G., Oliver, Seb, Efstathiou, Andreas, Eaton, N., Goldschmidt, P., Mobasher, Bahram, Serjeant, Stephen, Sumner, T. J., Danese, L., Elbaz, David, Franceschini, Alberto, Egami, Eiichi, Kontizas, Maria, Lawrence, A., McMahon, Richard G., Norgaard-Nielsen, H. U., Pèrez-Fournon, Ismael, González-Serrano, José Ignacio
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1997
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/394004
Acceso en línea:http://hdl.handle.net/10261/394004
Access Level:acceso abierto
Palabra clave:Stars: formation
Galaxies: evolution
Galaxies: starburst
Infrared: galaxies
Cosmology: observations
Descripción
Sumario: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 8-1000Φ M− yr−1, where Φ 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.

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