The Astrophysical Journal · 1985 · 188 citations · 0 references
EngineeringAstrostatisticsMulticolor StudiesRadio CommunicationGhz Source CountsAstronomical Image AnalysisSpace SciencesRadiation ImagingObservational CosmologyView Abstract CitationsPhotometryRadiation MeasurementRadiometrySynchrotron RadiationRadio TelescopeSpace WeatherHigh-energy AstrophysicsRadio ScienceRadio PropagationAstroinformaticsLeiden-berkeley Deep SurveySub-millijansky 1.4
Sub‑millijansky 1.4 GHz radio surveys probe the faint radio galaxy population, providing key insights into the evolution of weak radio sources. The study aims to use optical imaging to investigate the nature of sub‑millijansky 1.4 GHz radio sources. The authors conducted a 45 μJy‑sensitive VLA 21 cm survey of the LBDS Lynx.2 field and performed deep optical identifications with calibrated photometry from four‑band Kitt Peak 4 m Mayall prime‑focus plates. The survey cataloged 124 sources (93 complete to 5σ), showing a flattening of differential counts below 5 mJy, with a growing blue radio galaxy population between 1–10 mJy and predominantly faint blue galaxies below 1 mJy. Published in The Astrophysical Journal (Feb 1985, DOI 10.1086/162911) by Windhorst & Miley.
view Abstract Citations (248) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Sub-millijansky 1.4 GHz source counts and multicolor studies of weak rado galaxy populations. Windhorst, R. A. ; Miley, G. K. Owen, F. N. ; Kron, R. G. ; Koo, D. C. Abstract A deep survey has been carried out with the VLA at 21 cm to a noise level of 45 μJy. The region chosen was the Leiden-Berkeley Deep Survey (LBDS) area Lynx.2, known to be devoid of radio sources stronger than 10 mJy. A catalog of 124 sources is presented, of which 93 form a sample complete to the 5 σ level. The normalized differential source counts show a flattening below 5 mJy. Optical data are used to probe the nature of the sub-millijansky radio source population. Deep identifications and calibrated photometry are made on prime-focus plates obtained in four bands with the Kitt Peak 4 m Mayall telescope. In the complete sample 41 radio sources are reliably identified. It is shown that for radio sources with 1 < S1.4 < 10 mJy a blue radio galaxy population becomes increasingly important; these often have a peculiar optical morphology indicative of interacting or merging galaxies. Below 1 mJy the VLA sources consist of some red galaxies, but the majority are faint blue galaxies mostly fainter than V ≈ 20. Publication: The Astrophysical Journal Pub Date: February 1985 DOI: 10.1086/162911 Bibcode: 1985ApJ...289..494W Keywords: Astronomical Catalogs; Astronomical Photometry; Extragalactic Radio Sources; Radiant Flux Density; Radio Galaxies; Centimeter Waves; Cosmology; Functions (Mathematics); Seyfert Galaxies; Spiral Galaxies; Visible Spectrum; Astrophysics full text sources ADS | data products NED (149)