arXiv subjects

O. H. Guseinov

Publications and source records attributed to O. H. Guseinov.

8 recordsLinked to original sources

arXiv2004

The Strong Magnetic Field Decay and Evolution of Radio Pulsars on the P--P Diagram

In this work we have analysed various data on radio pulsars and we have shown that magnetic field decay of a factor about 10-20 is necessary to explain their evolution, in particular to remove the discrepancy between the characteristic and the real ages. The character of the field decay is exponential with a characteristic time of about 3$\times10^6$ yr. Observational data on single X-ray pulsars which radiate due to cooling also support this result.

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arXiv2003

Dependences of the X-ray luminosity and pulsar wind nebula on different parameters of pulsars and the evolutionary effects

Dependences of the X-ray luminosity (L$_x$) of single pulsars, due to ejection of relativistic particles, on electric field intensity, rate of rotational energy loss (Ė), magnetic field, period, and the energy spectra of the ejected particles are discussed. Influence of the magnetic field and effects of some other parameters of neutron stars on the L$_x$-Ė and the L$_x$-$τ$ (characteristic time) dependences are considered. Evolutionary factors also play an important role in our considerations. We find that only the pulsars with L$_{2-10keV}$$>10^{33}$ erg/s have pulsar wind nebula around them. The pulsars from which $γ$-ray radiation has been observed have low X-ray luminosities in general.

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arXiv2003

Origin of PSRs with 0.1 < P < 0.3 s and 5 x 1E5 < Tau < 1E7 yr after the second Supernova explosion in HMXBs

The origin of a part of the single pulsars with relatively low magnetic fields B < 1E12 G and with characteristic times Tau < 1E7 yr is established. Such pulsars occur as a result of the disruption of High Mass X-ray Binary Systems after a second Supernova explosion. In these binaries mass accretion onto the surface of X-ray pulsars leads to the decrease of the magnetic field from its initial value B ~ 1E12-1E13 G down to B < 1E12 G similar to the processes in Low Mass X-ray Binaries.

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arXiv2002

Distances and Other Parameters for 1315 Radio Pulsar

In this work we have collected observational data for 1315 PSRs. Distances and others parameters for these PSRs were estimated. We present improved distance estimates for radio pulsars by considering importance of their physical properties and improvement of distribution of SFRs (star formation regions) in the Galaxy. For this purpose, both a list of accurate calibrators was constructed and several accurate criteria were established. The following values were calculated from PSRs observational data: luminosities at 400 Mhz and 1400 Mhz, characteristic times, strength of magnetic field and rate of rotation energy. This compilation of data is mainly necessary for statistical investigations and for the physical properties of neutron stars. The whole data is prepared in a publicly accessible web page: http://www.xrbc.org/pulsar/ .

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arXiv2002

Pulsar Luminosity Function

We construct and investigate the pulsar luminosity function using the new catalogue which includes data for 1315 radio pulsars. The luminosity functions are constructed for 400 and 1400 MHz separately, and they are compared. Also, the luminosity functions excluding the binary millisecond pulsars and other pulsars with low magnetic fields are constructed. The 1400 MHz luminosities as a function of characteristic age and as a function of magnetic field for radio pulsars, anomalous X-ray pulsars and dim radio quiet neutron stars are presented and the implications of the pulsar luminosity function on these new kind of neutron stars are discussed.

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arXiv2002

Statistical Investigations of 1315 Radio Pulsars

In this paper we have used the data of 1315 pulsars (Guseinov et al. 2002) for statistical analysis and showed the changes in pulsar parameters since the appearance of Taylor et al. (1996) catalog. Here we present the space distribution of pulsars, dispersion measures, distances from the galactic plane and from the Sun, electron density, luminosity distributions at 400 and 1400 MHz, the relations between luminosities of pulsars at 400 and 1400 MHz and the dependence of luminosity on age and on magnetic field. We also present the updated P-Pdot diagram.

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arXiv2001

Genetic Connections of Anomalous X-ray Pulsars and Soft Gamma Repeaters with Supernova Remnants

Genetic connections between anomalous X-ray pulsars (AXPs) or soft gamma ray repeaters (SGRs)and supernova remnants (SNRs) can hold important clues to the nature of these objects through the properties of the associated SNRs. We examine various criteria jointly to assess the reliability of possible connections. 3 AXPs and 2 SGRs are most probably genetically connected with SNRs. Distances and ages are discussed and their likely ranges are indicated.

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arXiv1995

A search for X-rays from five pulsars: PSR's 0740-28, 1737-30, 1822-09, 1915+13 and 1916+14

We report observations of PSR's 0740-28, 1737-30, 1822-09, 1915+13 and 1916+14 with ROSAT. In the 0.1-2.1 keV range upper limits to luminosity are derived for power law and blackbody spectra, using a range of $N_{H}$ estimates. The upper limit to the blackbody luminosity from PSR1822-09 turns out to be consistent with standard cooling curves. For the other pulsars the upper limits are not restrictive as they are much larger than the luminosities predicted by the models.

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