On Possibility of Detection of Variable Sources Using the Data of "Cold" Surveys Carried Out on RATAN-600
arXiv:1409.3658 · doi:10.1134/S199034131203008X
Abstract
In this study we attempt to assess the possibility of detection of variable sources using the data of the 7.6-cm wavelength surveys carried out on the RATAN-600 radio telescope in the period from 1980 through 1994. Objects selected according to certain criteria from the RCR catalog are used to construct the calibration curves and to estimate the accuracy of the resulting calibration curves and determine the r.m.s. errors for the measured source flux densities. To check the calibration sources for the presence of variable objects, quantitative estimates are performed for a number of parameters that characterize variability, in particular, for the long-term variability index V and the chi-square probability p. The long-term variability index was found to be positive for 14 out of approximately 80 calibration sources, possibly indicating that these sources are variable. The most likely candidate variables are the three sources with the chi-square probability p > 0.95. Five sources have chi-square probabilities in the 0.85 < p < 0.95 interval, and the remaining six in the 0.6 < p < 0.8 interval. Nine out of 14 objects are possibly variable in the optical range. The light curves and spectra are determined for possible variable sources and a number of "non-variable" objects. We plan to use the results of this study in our future searches for variable radio sources using the data of the "Cold" surveys.
References in corpus (8)
- The Second-Generation Guide Star Catalog: Description and Properties
- The VLA Low-frequency Sky Survey
- FIRST `Winged' and `X'-shaped Radio Source Candidates
- Evidence for a population of beamed radio intermediate quasars
- RATAN-600 7.6-cm Deep Sky Strip Surveys at the Declination of the SS433 Source During the 1980-1999 Period. Data Reduction and the Catalog of Radio Sources in the Right-Ascension Interval 7h < R.A. < 17h
- Spectroscopy of "Big Trio" objects using the "Scorpio" spectrograph of the 6-m telescope of the Special astrophysical observatory
- Study of the Power Beam Pattern of RATAN-600 During the Deep RZF Survey (1998-2003)
- Radio interferometric observations of two core-dominated triple radio sources at z>3