Millimeter observations of variable radio sources in the Galactic plane |
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| Institution: | 1. National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181–8588, Japan;2. Dept. of Physics & Astronomy, University of New Mexico, NM 87131, U.S.A.;1. School of Mechanical Engineering, Dalian University of Technology, Dalian 116023, China;2. School of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150000, China;3. Dalian Dagao Valve Co., Ltd., Dalian 116037, China;1. Centre for Environment, Fisheries and Aquaculture Science, Pakefield Road, Lowestoft, Suffolk NR33 0HT, United Kingdom;2. British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, United Kingdom;3. British Geological Survey, Environmental Science Centre, Nicker Hill, Keyworth, Nottinghamshire NG12 5GG, United Kingdom;1. Department of Civil and Environmental Engineering, The Pennsylvania State University, Greenberg Building, University Park, PA 16802, United States;2. Department of Chemical Engineering, The Pennsylvania State University, Greenberg Building, University Park, PA 16802, United States |
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| Abstract: | We report on multi-epoch millimeter observations of variable radio sources that were identified through the 6-cm Galactic plane survey by Gregory and Taylor. Although the aim of the original survey was to search for exotic galactic radio sources such as Cyg X-3, our multifrequency study in the past suggested that the majority of these sources are extragalactic. To explore intrinsic variability of these sources, we carried out monitoring observations at short millimeter wavelengths where the interstellar scintillation effects become less significant and stronger intrinsic variability is expected as the millimeter emission arises from deeper in the cores. Most of the observed sources show moderate degrees of millimeter variability indicating they are intrinsically variable. The spectra for some observed sources are flat out to millimeter wavelengths — similar to that of blazars. Thus the survey sample is likely to contain many unidentified radio-loud AGN behind the Milky Way. |
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