Decametric survey of discrete sources in the Northern sky

Braude, S. Ya.; Megn, A. V.; Rashkovski, S. L.; Ryabov, B. P.; Sharykin, N. K.; Sokolov, K. P.; Tkatchenko, A. P.; Zhouck, I. N.

doi:10.1007/bf00637903

Cited by 29 publications

(16 citation statements)

References 3 publications

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“…From the UTR-2 catalogue (Braude et al, 1978(Braude et al, , 1979(Braude et al, , 1981a(Braude et al, , 1981b(Braude et al, , 2003 we have formed sample of radio sources with steep spectrum including objects with linear steep spectrum (S-type) and spectrum with low-frequency steepness after a break (C+ type). Within the declination ranges from -13 to +20 degrees and from 30 to 40 degrees of the UTR-2 catalogue we have identified 78 galaxies and 55 quasars with linear steep spectrum (S-type) and 52 galaxies and 36 quasars with break steep spectrum (C+type) (with flux density at 25 MHz S 25 > 10 Jy and spectral index larger 1).…”

Section: Luminosity -Linear Size Relation For Powerful Giant Sourcesmentioning

confidence: 99%

Luminosity-Linear Size Relation for Galaxies and Quasars With Steep Radio Spectrum

Miroshnichenko

2015

OAP

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Our data for sources with steep radio spectrum, detected with radio telescope UTR-2 at the decametre band give evidence on the great luminosities, linear sizes, characteristic ages of these objects. In connection with such peculiarities, we examine the luminosity-linear size relation of galaxies and quasars with steep radio spectrum at the decametre band. It turned out, that this relation has similar trends for considered radio sources with linear steep spectrum and break steep spectrum. Also we presented the luminosity ratio-linear size relation at different frequency ranges. We discuss the obtained evolution relations for galaxies and quasars with steep low-frequency radio spectrum.

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Section: Luminosity -Linear Size Relation For Powerful Giant Sourcesmentioning

confidence: 99%

Luminosity-Linear Size Relation for Galaxies and Quasars With Steep Radio Spectrum

Miroshnichenko

2015

OAP

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“…-The very low frequency Northern sky survey of discrete sources was created with the UTR-2 at 10-25 MHz (Braude 1961;Braude et al 1978c;Braude et al 2002). -The spectra of numerous discrete sources in the Northern sky were obtained in decameter range with the UTR-2 (Bazelyan et al 1965;Braude et al 1969;Braude et al 1970;Braude et al 1995;).…”

Section: Important Results Of Braude's Teammentioning

confidence: 99%

The beginnings of decameter radio astronomy: pioneering works of Semen Ya. Braude and his followers in Ukraine

2007

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Key words techniques: low-frequency astronomy -instrumentation: interferometers -history and philosophy of astronomy -obituaries, biographies S.Ya. Braude (1911 was the well-known radio astronomer, one of the founders of low-frequency astronomical research in the world, in particular in the former Soviet Union. He began to work in this field of science in 1957, in Kharkiv city (Ukraine), from the design and manufacturing small decameter interferometer ID-1 and ID-2. Since that time Braude and his team have developed more sophisticated radio decameter telescopes as UTR-1 and UTR-2 (the largest in the world till now) as well as the first decameter VLBI network URAN. They have obtained some important pioneering results about low-frequency radio emission of objects in our Solar system, Galaxy and Metagalaxy by means of these telescopes. In this paper the key events of early history of decameter radio astronomy research in the former USSR are mentioned with emphasizing the role of S. Braude. For the period of 1957-1962, the quotations of Braude's Personal Diary (2003) are first laying open to the public. The most important results obtained by S.Ya. Braude and his followers as well as perspectives of decameter radio astronomy in Ukraine and in the world are highlighted briefly.

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“…As it follows from the UTR-2 catalogue of extragalactic sources at the decametre band ( Braude et al 1978, Braude et al 1979, Braude et al 1981a, Braude et al 1981b, Braude et al 2003 near 30 percent of sources have steep radio spectra (the spectral index is α 1). According to conclusion by Kardashev (1962) , the critical frequency of the synchrotron emission of radio source can displace to value less than 10 MHz when the electron acceleration is not continuous.So, the radio spectrum will be steep.…”

Section: Introductionmentioning

confidence: 95%

Independent estimates of energies of steep-spectrum radio sources

Miroshnichenko¹

2013

Proc. IAU

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We examine properties of galaxies and quasars with steep low-frequency spectra from the UTR-2 catalogue. The number of the objects have the non-thermal X-ray emission due to the inverse Compton scattering of radio photons of the microwave background by relativistic electrons. So, it is possible to estimate the magnetic field strength and the ratio of energies of the magnetic field and relativistic particles, independently. As we have received the determined values of magnetic field strength are near to one order less than those at the well-known energy equipartition condition. We conclude from the obtained energy ratio that the energy of relativistic particles prevails over the energy of magnetic field in the galaxies and quasars with steep radio spectra.

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Decametric survey of discrete sources in the Northern sky

Cited by 29 publications

References 3 publications

Luminosity-Linear Size Relation for Galaxies and Quasars With Steep Radio Spectrum

Luminosity-Linear Size Relation for Galaxies and Quasars With Steep Radio Spectrum

The beginnings of decameter radio astronomy: pioneering works of Semen Ya. Braude and his followers in Ukraine

Independent estimates of energies of steep-spectrum radio sources

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