Deep 3-GHz observations of the Lockman Hole North with the Very Large Array – II. Catalogue and μJy source properties
| Autor: | Tessa Vernstrom, J. V. Wall, Richard A. Perley, W. D. Cotton, Douglas Scott, James J. Condon, K. I. Kellermann |
|---|---|
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 462:2934-2949 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | This is the second of two papers describing the observations and source catalogues derived from sensitive 3-GHz images of the Lockman Hole North using the Karl G. Jansky Very Large Array. We describe the reduction and cataloguing process, which yielded an image with 8 arcsec resolution and instrumental noise of \sigma$_{\rm n}$=1.0 \mu Jy beam$^{-1}$ rms (before primary beam corrections) and a catalogue of 558 sources detected above 5\sigma$_{\rm n}$. We include details of how we estimate source spectral indices across the 2-GHz VLA bandwidth, finding a median index of -0.76$\pm$0.04. Stacking of source spectra reveals a flattening of spectral index with decreasing flux density. We present a source count derived from the catalogue. We show a traditional count estimate compared with a completely independent estimate made via a P(D) confusion analysis, and find very good agreement. Cross-matches of the catalogue with X-ray, optical, infrared, radio, and redshift catalogues are also presented. The X-ray, optical and infrared data, as well as AGN selection criteria allow us to classify 10 per cent as radio-loud AGN, 28 percent as radio-quiet AGN, and 58 per cent as star-forming galaxies, with only 4 per cent unclassified. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|