Abstract
A new 6 cm survey of almost 0.6 deg2 to a limit of 0.55 mJy beam-1 (10 σ) finds 37 isolated radio sources and seven radio-source pairs (not necessarily physical companions). Infrared Array Camera (IRAC) counterparts are identified for at least 92% of the radio sources within the area of deep IRAC coverage, which includes 31 isolated sources and six pairs. This contrasts with an identification rate of <74% to R < 23.95 in visible light. Eight of the IRAC galaxies have power-law spectral energy distributions, implying that the mid-infrared emission comes from a powerful active galactic nucleus (AGN). The remaining 26 IRAC galaxies show stellar emission in the mid-infrared, probably in most of these galaxies because the stellar emission is bright enough to outshine an underlying AGN. The infrared colors suggest that the majority of these galaxies are bulge-dominated and have redshifts 0.5 ≲ z ≲ 1. Visible spectra from the DEEP2 Redshift Survey, available for 11 galaxies, are consistent with this suggestion. The IRAC galaxies fall into two distinct groups in a color-magnitude diagram. One group (the "stripe") includes all the AGNs. The other group (the "blue clump") has blue 3.6-8 μm colors and a small range of 8 μm magnitudes. This separation should be useful in classifying galaxies found in other radio surveys.
Original language | English (US) |
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Pages (from-to) | 2159-2170 |
Number of pages | 12 |
Journal | Astronomical Journal |
Volume | 132 |
Issue number | 5 |
DOIs | |
State | Published - Nov 2006 |
Keywords
- Galaxies: active
- Galaxies: general
- Galaxies: high-redshift
- Infrared: galaxies
- Radio continuum: galaxies
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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IRAC counterparts of 6cm galaxies in EGS
Willner, S. P. (Creator), Coil, A. L. (Creator), Goss, W. M. (Creator), Ashby, M. L. N. (Contributor), Barmby, P. (Creator), Huang, J.-S. (Creator), Ivison, R. (Creator), Koo, D. C. (Creator), Egami, E. (Creator) & Miyazaki, S. (Creator), Centre de Donnees Strasbourg (CDS), 2008
DOI: 10.26093/cds/vizier.51322159, https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/132/2159
Dataset