Near-Infrared K-Band Imaging of a Sample of Ultra-Steep-Spectrum Radio Sources Selected at 74 MHz
Abstract
In this paper we present near-infrared K-band imaging of a sample of ultra-steep-spectrum (USS) radio sources selected at 74 MHz. The dual selection criteria of low frequency and USS mean that we should be sensitive to the highest-redshift (z > 5) radio galaxies. We have obtained K-band magnitudes for all of the objects in our sample of 26 and discuss the properties of each. There is a pronounced bias in this sample towards fainter magnitudes and thus higher redshifts when compared to complete unfiltered samples such as the 7CRS of Willott et al., implying that the steep-spectrum technique is still viable at 74 MHz. However, there are more bright (K < 17) sources in the 74-MHz sample than in a similar sample selected at 151 MHz, namely 6C*. This is principally due to the additional selection criterion of a small angular size for the radio sources in 6C*; four of the six sources in the 74-MHz USS sample with K < 17 have angular sizes >15 arcsec (the angular size cut-off of 6C*). We find that the distribution of K-band magnitudes from a sample selected at 74 MHz is statistically indistinguishable from the 6C* sample, when similar angular size filtering is applied to the 74-MHz sample.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2004
- Accession Number
- ADA464314
Entities
People
- Aaron S. Cohen
- Huub J. Roettgering
- Maria J. Cruz
- Matt J. Jarvis
- Namir E. Kassim
Organizations
- United States Naval Research Laboratory