2000/02/29 by Frank J. Masci, J. J. Condon, T. A. Barlow +9 · 2 citations
Physics and Astronomy · #Absorption (acoustics) #Active galactic nucleus #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Infrared #Luminous infrared galaxy #Near-infrared spectroscopy #Optics #Photometry (optics) #Physics #Quasar #Radio Astronomy Observations and Technology #Radio galaxy #Sky #Star formation #Stars #X-shaped radio galaxy #astro-ph
paper · pdf · doi:10.1086/317978
53 pages, 12 figures, 4 tables, accepted for publication by PASP. For higher quality versions of figures 2 and 8, see http://spider.ipac.caltech.edu/staff/fmasci/home/publications.html
arxiv created 2000/10/07 · openalex publication_date 2001/01/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The Very Large Array has been used in C configuration to map an area ≃0.3 deg 2 at 1.4 GHz with 5 σ sensitivities of 0.305, 0.325, 0.380, and 0.450 mJy beam -1 over four equal subareas. Radio properties are presented for 62 detected sources. Deep optical imaging to Gunn r≃25 mag using the Hale 5 m telescope covering ≃0.21 deg 2 is reported for a subset of 43 sources. This optical follow‐up is much deeper than that of existing larger area radio surveys of similar radio sensitivity. Archival J ‐, H ‐, and K ‐band photometry from the Two‐Micron All Sky Survey is also presented. Using a robust likelihood ratio technique, we optically identified 26 radio sources with probabilities ≳80%, nine with uncertain/ambiguous detections, and eight with empty fields. Comparisons with a stellar synthesis model that includes radio emission and dust reddening suggest that the near‐infrared–optical emission in a small, bright subsample is reddened by "optically thin" dust with absorption A V ≃2–2.5 mag, regardless of morphological type. This is consistent with other, more direct determinations of absorption. The radio–optical(–near‐infrared) flux ratios of early‐type galaxies require significant contamination in the radio by an active galactic nucleus, consistent with the current paradigm. Using our simple modeling approach, we also discuss a potential diagnostic for selecting ultraluminous infrared galaxies to z≃1.6 from microjansky radio surveys.