Observations of the Hubble Deep Field South with the Infrared Space Observatory - II. Associations and star formation rates

Details Observations of the Hubble Deep Field South with the Infrared Space Observatory - II. Associations and star formation rates Observations of the Hubble Deep Field South with the Infrared Space Observatory - II. Associations and star formation rates

2002-01-30

arxiv.org/abs/astro-ph/0201510v2

Astronomy and Astrophysics

Astrophysics

Accepted for MNRAS. 23 pages, 10 figures (Figs. 4&6 included here as low resolution JPEGS), latex, uses mn,epsfig. Further inf

Scientific paper

10.1046/j.1365-8711.2002.05310.x

We present results from a deep mid-IR survey of the Hubble Deep Field South (HDF-S) region performed at 7 and 15um with the CAM instrument on board ISO. We found reliable optical/near-IR associations for 32 of the 35 sources detected in this field by Oliver et al. (2002, Paper I): eight of them were identified as stars, one is definitely an AGN, a second seems likely to be an AGN, too, while the remaining 22 appear to be normal spiral or starburst galaxies. Using model spectral energy distributions (SEDs) of similar galaxies, we compare methods for estimating the star formation rates (SFRs) in these objects, finding that an estimator based on integrated (3-1000um) IR luminosity reproduces the model SFRs best. Applying this estimator to model fits to the SEDs of our 22 spiral and starburst galaxies, we find that they are forming stars at rates of ~1-100 M_sol/yr, with a median value of ~40M_sol/yr, assuming an Einstein - de Sitter universe with a Hubble constant of 50 km/s/Mpc, and star formation taking place according to a Salpeter (1955) IMF across the mass range 0.1-100M_sol. We split the redshift range 0.0

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