J. J. Condon et al. 2002 The Astronomical Journal 124 675 doi:10.1086/341650
Radio Sources and Star Formation in the Local Universe
FREE ISSUEJ. J. Condon1, W. D. Cotton1 and J. J. Broderick2
Show affiliationsGalaxies from the entire Uppsala Galaxy Catalog (UGC) have been identified with 4583 radio sources stronger than 2.5 mJy at 1.4 GHz from the NRAO VLA Sky Survey (NVSS). The complete sample of 3398 galaxies brighter than mp = 14.5 in the area defined by δ > -2°30' and |b| > 20° yielded the UGC/NVSS sample of 1966 radio sources. Their dominant energy sources were classified as stars (85%) or active galactic nuclei (15%). The luminosity function of star-forming galaxies agrees well with the far-infrared (FIR) luminosity function converted to 1.4 GHz by the FIR/radio correlation. The spectral power density of star-forming galaxies is USF = (1.53 ± 0.07) × 1019 W Hz-1 Mpc-3 (statistical errors only) if H0 = 70 km s-1 Mpc-1. We used a model consistent with the observed FIR/radio correlation to estimate the corresponding star formation rate density within the past τ ~ 3 × 108 yr; it is ρSF(M > 0.1 M
) ≈ 0.018 M yr-1 Mpc-3. The radio sources in star-forming galaxies may be evolving even at moderately low redshifts (z ~ 0.1).
- Footnote
- Keywords
catalogs; galaxies: evolution; galaxies: general; galaxies: luminosity function, mass function; galaxies: starburst
- Dates
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Issue 2 (2002 August)
Received 2002 April 1, accepted for publication 2002 May 8
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Radio Sources and Star Formation in the Local Universe
J. J. Condon et al. 2002 The Astronomical Journal 124 675
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