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Spectral characteristics and variability of radio sources near the north celestial pole

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Abstract

We present the results of our observations of compact extragalactic radio sources near the north celestial pole (+75° ≤ δ ≤ +88°) obtained on the RATAN-600 radio telescope. Our sample consists of 51 radio sources with spectra that are either flat or inverted (growing toward shorter wavelengths) and with flux densities at 1.4 GHz S ν ≥ 200 mJy. We observed the sources at 1–21.7 GHz. Multi-frequency instantaneous spectra are presented for 1999–2007. We observed 33 of our sample source daily for 30 days in August 2007. As a result, we revealed 15 objects exhibiting rapid variations on time scales of a day. The multi-frequency instantaneous spectra of these sources indicate that radio flux variations on one-day timescales are characteristic of objects of various spectral types. More than half the sources exhibiting rapid variations demonstrate a growth in the variability amplitude with increasing frequency. For some of the objects, the variability amplitude is virtually independent of frequency.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhniĭ Arkhyz, Karachaĭ-Cherkessian Republic, 357147, Russia

    M. G. Mingaliev & Yu. V. Sotnikova

  2. Southern Federal University (Rostov University), ul. Bol’shaya Sadovaya 105, Rostov-on-Don, 334006, Russia

    M. G. Mingaliev

  3. Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997, Russia

    N. S. Kardashev & M. G. Larionov

Authors
  1. M. G. Mingaliev
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  2. Yu. V. Sotnikova
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  3. N. S. Kardashev
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  4. M. G. Larionov
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Additional information

Original Russian Text © M.G. Mingaliev, Yu.V. Sotnikova, N.S. Kardashev, M.G. Larionov, 2009, published in Astronomicheskiĭ Zhurnal, 2009, Vol. 86, No. 6, pp. 531–545.

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Mingaliev, M.G., Sotnikova, Y.V., Kardashev, N.S. et al. Spectral characteristics and variability of radio sources near the north celestial pole. Astron. Rep. 53, 487–500 (2009). https://doi.org/10.1134/S1063772909060018

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  • DOI: https://doi.org/10.1134/S1063772909060018

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