Search for variable sources using the data of Cold surveys in the right-ascension interval 2h ≤ RA ≤ 6h View Full Text


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Article Info

DATE

2015-01

AUTHORS

E. K. Majorova, O. P. Zhelenkova, A. V. Temirova

ABSTRACT

We search for variable objects at 3.94 GHz in the 1988–1994 surveys within the right-ascension interval 2h ≤ RA ≤ 6h. In this study we continue to develop our technique for identifying variable radio sources in the Cold surveys. We identified a total of 195 radio sources in the available sky transit scans, and only 145 objects have their flux measured in two or more surveys. To check these radio sources for variability, we estimated the indices V of long-term variability, the relative variability amplitude Vχ, and the χ2 probability p. Among the 145 objects considered, 15 have positive long-term variability indices (V >0). Of these, five sources have χ2 probability p greater than 0.95. Three objects with p > 0.996 can be considered reliably variable sources, and two objects with probabilities 0.95 < p < 0.996 can be considered possibly variable sources. Eight objects prove to be reliably variable according to an analysis of our data combined with the flux measurements by other authors, performed within the framework of the 1980 survey. We draw the light curves for sources with positive long-term variability indices and perform optical identification of these objects. More... »

PAGES

33-44

References to SciGraph publications

  • 2003-11. Spectra, optical identifications, and statistics of a complete sample of radio sources at declinations 10°–12°30′ in ASTRONOMY REPORTS
  • 2013-10. Search for variable sources using data of “Cold” surveys in ASTROPHYSICAL BULLETIN
  • 2012-07. On possibility of detection of variable sources using the data of “Cold” surveys carried out on RATAN-600 in ASTROPHYSICAL BULLETIN
  • 2008-04. Long-term variability of a complete sample of flat-spectrum radio sources at declinations of 4°–6° (B1950) in ASTRONOMY REPORTS
  • 2013-01. Identification and properties of host galaxies of RCR radio sources in ASTROPHYSICAL BULLETIN
  • 2009-04. Observations of the rapid variability of the two BL Lac type objects J2005+77 and J2022+76 with the RATAN-600 in ASTROPHYSICAL BULLETIN
  • 2009-04. Analysis of a sample of RC catalog objects in the region overlapping with the areas covered by FIRST and SDSS surveys. II: Optical identification with the SDSS survey and USNO-B1 and 2MASS catalogs in ASTROPHYSICAL BULLETIN
  • 2010-10-12. Variability of the flux densities of radio sources on timescales shorter than a month in ASTRONOMY REPORTS
  • 2006-05. Deep RATAN-600 surveys at the declination of SS 433 carried out in 1987–2000 at 7.6 and 2.7 cm in ASTRONOMY REPORTS
  • 2010-01. 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 in ASTROPHYSICAL BULLETIN
  • 2000-03. Rapid variability of the radio flux density of 0524 + 034 in ASTRONOMY REPORTS
  • 1990-06. Continuum radiation from active galactic nuclei in THE ASTRONOMY AND ASTROPHYSICS REVIEW
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1134/s1990341315010046

    DOI

    http://dx.doi.org/10.1134/s1990341315010046

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1010744958


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