| Title | Near-infrared K-band imaging of a sample of ultra-steep-spectrum radio sources selected at 74 MHz |
| Authors | Jarvis, Matt J.; Cruz, Maria J.; Cohen, Aaron S.; Röttgering, Huub J. A.; Kassim, Namir E. |
| Bibcode | 2004MNRAS.355...20J Search ADS ↗ |
| 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. |
| Objects | 27 Objects Search NED ↙ |
