The nature of the Mid-IR faint radio sources from the Spitzer First Look Survey

Details The nature of the Mid-IR faint radio sources from the Spitzer First Look Survey The nature of the Mid-IR faint radio sources from the Spitzer First Look Survey

2004-11-17

arxiv.org/abs/astro-ph/0411492v1

Astronomy and Astrophysics

Astrophysics

2 pages, to appear in the proceedings of the workshop "Multiband approach to AGN" Bonn October 2004 in Memorie della Societa A

Scientific paper

Data from the Spitzer Space Telescope (the First Look Survey - FLS) have recently been made public. We have compared the 24 micron images with very deep WSRT 1.4 GHz observations, centred on the FLS verification strip (FLSv). Approximately 75% of the radio sources have corresponding 24 micron identifications. Such a close correspondence is expected, especially at the fainter radio flux density levels, where star forming galaxies are thought to dominate both the radio and mid-IR source counts. However, a significant fraction of radio sources detected by WSRT (25%) have no mid-IR detection in the FLSv (implying a 24 micron flux density less than 0.1 mJy). We present initial results on the nature of the radio sources without Spitzer identification, using data from various multi-waveband instruments, including the publicly available R-band data from the Kitt Peak 4-m telescope.

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