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1.
We estimate the absolute intensity of the Hα emission line in M17 based on spectroscopic observations with the 70 cm telescope of the Fesenkov Astrophysical Institute and the 1.25 m telescope of the Sternberg Astronomical Institute’s Crimean Laboratory. The visual extinction, A v , is derived for about 250 regions in the nebula via a comparison of the optical (Hα) and radio (21 cm continuum) emissions. The A v values for the eastern, optically bright, part of the nebula are 2–6m. For the western part, which is covered by a dark cloud, the extinction is A v = 7?14.5m. We derived I(Hα)/I([NII] λ6584) ratios and estimated the degree of ionization of nitrogen in the nebula; we find that most nitrogen is in the [NIII] state. 相似文献
2.
Bikmaev I. F. Irtuganov E. N. Nikolaeva E. A. Sakhibullin N. A. Gumerov R. I. Sklyanov A. S. Glushkov M. V. Khamitov I. M. Borisov V. D. Burenin R. A. Zaznobin I. A. Krivonos R. A. Lyapin A. R. Medvedev P. S. Meshcheryakov A. V. Sazonov S. Yu. Sunyaev R. A. Khorunzhev G. A. Gilfanov M. R. 《Astronomy Letters》2021,47(5):277-290
Astronomy Letters - Results of the spectroscopic observations at the 1.5-m Russian–Turkish telescope for another group of 12 X-ray sources discovered by the eROSITA telescope onboard the SRG... 相似文献
3.
Khamitov I. M. Bikmaev I. F. Burenin R. A. Glushkov M. V. Melnikov S. S. Lyapin A. R. 《Astronomy Letters》2020,46(1):1-11
Astronomy Letters - An example of simultaneous spectroscopic redshift measurements for a large number of galaxies in a cluster by multiobject spectroscopy with the medium- and low-resolution TFOSC... 相似文献
4.
A. V. Glushkov 《Astronomy Letters》2003,29(3):142-152
We present the results of a harmonic analysis of and search for clusters in the arrival directions of cosmic rays with energies E0≥5×1016 eV and zenith angles ?≤53° detected at the Yakutsk extensive air shower (EAS) array from 1974 to 2002. We show that the phase of the first harmonic periodically varies greatly and takes on nonrandom values at a confidence level ≥4σ. These phases point to the Supergalactic plane (the Local supercluster of galaxies). 相似文献
5.
We analyze the directions of the arrival of cosmic rays with energies E 0≥3×1018 eV and zenith angles θ≤45° recorded by the Yakutsk extensive air shower (EAS) facility during 1974–2000. They are shown to have a small-scale structure with scale sizes of 5°–10°. Enhanced particle fluxes compared to the expected levels for random distributions at (4–5)σ are observed from the Galactic and Supergalactic planes. 相似文献
6.
Galactic cosmic rays-clouds effect and bifurcation model of the Earth global climate. Part 1. Theory
7.
Results of a harmonic analysis of the arrival directions for primary cosmic-ray particles with energies E 0 ? 1017 eV and zenith angles θ ? 45° recorded on the Yakutsk array over 29 years of its continuous operation (1983–2012) are presented. These events are shown to have different global anisotropies in different time intervals: the phase of the first harmonic φ 1 = 119° ± 18° and its amplitude A 1 = 0.030 ± 0.014 in the 1983–1994 samples changed into φ 1 = 284° ± 13° and A 1 = 0.033 ± 0.010 in 1998–2010. All of this could be caused by a considerably increased flux of heavy nuclei from the exit of the Galaxy’s local arm after 1996. 相似文献
8.
Signatures of low-dimensional chaos in hourly water level measurements at coastal site of Mariupol,Ukraine 总被引:2,自引:2,他引:0
V. Khokhlov A. Glushkov N. Loboda N. Serbov K. Zhurbenko 《Stochastic Environmental Research and Risk Assessment (SERRA)》2008,22(6):777-787
Variations of water levels in ports and estuaries are important for ship guidance and navigation and are influenced by a variety
of factors. The hourly data that was collected from the coastal site at the Port of Mariupol, Ukraine during January–December
2005 were analysed with an objective to reveal features of chaotic behaviour. The concepts and methods of chaos theory (average
mutual information, correlation dimension, false nearest neighbours, Lyapunov exponents) were applied. The manifestation of
low-dimensional chaos was found in the time series. The possibility of nonlinear prediction was concluded. 相似文献
9.
The lateral distribution of cascade particles in extensive air showers from cosmic rays with energy E0 ? 1017 eV has been studied at the Yakutsk array by the ground scintillation detectors over the period of continuous observations 1977–2017. The experimental data are compared with those computed with various models for the development of extensive air showers from the CORSIKA software package. The best agreement between the theory and experiment is observed for the QGSjet-01-d model. In the energy range (1?20)× 1017 eV there is a change in the cosmic-raymass composition from 〈lnA〉 ≈ 2.5 to the proton one. 相似文献
10.
Bikmaev I. F. Irtuganov E. N. Nikolaeva E. A. Sakhibullin N. A. Gumerov R. I. Sklyanov A. S. Glushkov M. V. Borisov V. D. Burenin R. A. Zaznobin I. A. Krivonos R. A. Lyapin A. R. Medvedev P. S. Meshcheryakov A. V. Sazonov S. Yu. Sunyaev R. A. Khorunzhev G. A. Gilfanov M. R. 《Astronomy Letters》2020,46(10):645-657
Astronomy Letters - Results of the first spectroscopic observations at the 1.5-m Russian–Turkish telescope for the X-ray sources discovered by the eROSITA telescope onboard the SRG space... 相似文献