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排序方式: 共有87条查询结果,搜索用时 15 毫秒
61.
Khorunzhev G. A. Meshcheryakov A. V. Medvedev P. S. Borisov V. D. Burenin R. A. Krivonos R. A. Uklein R. I. Shablovinskaya E. S. Afanasiev V. L. Dodonov S. N. Sunyaev R. A. Sazonov S. Yu. Gilfanov M. R. 《Astronomy Letters》2021,47(3):123-140
Astronomy Letters - During the first all-sky survey of the SRG orbital observatory, the X-ray source SRGE J170245.3+130104 was discovered with the eROSITA telescope on March 13–15, 2020. Its... 相似文献
62.
N. L. Frolova P. A. Belyakova V. Yu. Grigor’ev A. A. Sazonov L. V. Zotov 《Water Resources》2017,44(3):359-371
Many-year variations of river runoff in the Selenga basin are analyzed along with precipitation, potential evapotranspiration, and basin water storages. Data of ground-based (1932–2015) and satellite observations, as well as the analysis of literature data suggest the presence of within-century cycles in the series of annual and minimum runoff. Compared with 1934–1975, the Selenga Basin shows a general tendency toward a decrease in the maximum (by 5–35%) and mean annual (up to 15%) runoff at an increase in the minimum runoff (by 30%), a decrease in the mean annual precipitation (by 12%), and an increase in potential evapotranspiration by 4% against the background of a decrease in evaporation because of lesser soil moisture content and an increase in moisture losses for infiltration because of permafrost degradation. The observed changes in water balance may have unfavorable environmental effects. 相似文献
63.
I.?A.?MereminskiyEmail author E.?V.?Filippova R.?A.?Burenin S.?Yu.?Sazonov M.?N.?Pavlinsky A.?Yu.?Tkachenko I.?Yu.?Lapshov A.?E.?Shtykovskiy R.?A.?Krivonos 《Astronomy Letters》2018,44(2):67-80
To choose the best strategy for conducting a deep extragalactic survey with the ART-XC X-ray telescope onboard the Spectrum–Röntgen–Gamma (SRG) observatory and to estimate the expected results, we have simulated the observations of a 1.1° × 1.1° field in the 5–11 and 8–24 keV energy bands. For this purpose, we have constructed a model of the active galactic nuclei (AGN) population that reflects the properties of the X-ray emission from such objects. The photons that “arrived” from these sources were passed through a numerical model of the telescope, while the resulting data were processed with the standard ART-XC data processing pipeline. We show that several hundred AGNs at redshifts up to z ≈ 3 will be detected in such a survey over 1.2 Ms of observations with the expected charged particle background levels. Among them there will be heavily obscured AGNs, which will allow a more accurate estimate of the fraction of such objects in the total population to be made. Source confusion is expected at fluxes below 2 × 10?14 erg s?1 cm?2 (5–11 keV). Since this value can exceed the source detection threshold in a deep survey at low particle background levels, it may turn out to be more interesting to conduct a survey of larger area (several square degrees) but smaller depth, obtaining a sample of approximately four hundred bright AGNs as a result. 相似文献
64.
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
65.
M. G. Revnivtsev A. Yu. Kniazev S. Yu. Sazonov R. A. Burenin A. Tekola D. A. H. Buckley M. L. Pretorius J. Menzies W. Lawson 《Astronomy Letters》2009,35(1):33-38
Results of the optical identification of the hard X-ray source IGR J08390-4833 recently discovered in the INTEGRAL all-sky survey are presented. We show that the source is most likely a cataclysmic variable, i.e., an accreting white dwarf in a binary. Analysis of its optical light curve clearly reveals intrinsic variability on timescales of the order of an hour or longer. However, the short time of the source’s optical observations does not allow a definitive conclusion about the periodicity of the detected variability to be reached. Further optical and X-ray observations are required for a more accurate classification of the source. 相似文献
66.
I. F. Gertner V. V. Vrublevskii A. M. Sazonov T. S. Krasnova Yu. V. Kolmakov E. A. Zvyagina P. A. Tishin D. N. Voitenko 《Doklady Earth Sciences》2009,427(2):961-967
The first data are presented on the distribution of rare elements and isotope composition of neodymium and strontium in the
rocks of the alkaline-ultramafitic association of the Kresty volcanoplutonic structure (one of the probable satellites of
the Gulinian massif being the largest in the Maimecha-Kotui alkaline province in Polar Siberia). On the basis of the results
of geochemical studies performed and formerly obtained geophysical and isotope data, a new model is proposed for the plume
nature of magmatism in the region, based on the action of a single mantle source of the PREMA type and its active interaction
with the matter of the Earth’s crust. 相似文献
67.
V. A. Koroteev V. N. Ogorodnikov Yu. L. Ronkin V. N. Sazonov Yu. A. Polenov 《Doklady Earth Sciences》2009,429(2):1443-1446
In suture zones of the Urals, geological and physical-chemical conditions for formation of large ore and nonmetalliferous
deposits existed during each geodynamical environment of development of the Urals. The development was predetermined by the
duration and discontinuous-continuous existence of these structures, and the latter promoted the development of polygenetic
and polychronic pegmatites of various types (by depth and productivity) and other postmagmatites. It has been shown in the
example of the Ufalei metamorphic block that pegmatites of different ages (from R2 to P) are often spatially combined. In this paper, two age diagrams are presented: the first one is for geological events
that took place in the Ufalei metamorphic block; the second one is for Vendian pegmatites in it. The value of this paper is
determined by the fact that the data obtained in Ufalei block could be used for study of postmagmatites within its analogs,
which are gneissic-amphibolitic complexes of the Northern Urals, and especially by the fact that the project “Polar Urals,
Industrial Urals” is implemented there. 相似文献
68.
Sazonov D. S. Sadovsky I. N. Kuzmin A. V. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(12):1719-1730
Izvestiya, Atmospheric and Oceanic Physics - A regression approach is presented for the problem of restoring the sea surface temperature (SST) from radiometric measurements of a microwave... 相似文献
69.
A. N. Sazonov 《Astronomy Reports》2011,55(2):142-158
We present the results of WBVR observations of the low-mass X-ray binary V1341 Cyg = Cyg X-2. Our observations include a total of 2375 individual measurements
in four bands on 478 nights in 1986–1992. We tied the comparison and check stars used for the binary to the WBVR catalog using their JHK magnitudes. The uncertainty of this procedure was 3% in the B and V bands and 8%–10% for the W and R bands. In quiescence, the amplitude of the periodic component in the binary’s B brightness variations is within 0.265
m
–0.278
m
(0.290
m
–0.320
m
in W); this is due to the ellipsoidal shape of the optical component, which is distorted with gravitational forces from the X-ray
component. Some of the system’s active states (long flares) may be due to instabilities in the accretion disk, and possibly
to instabilities of gas flows and other accretion structures. The binary possesses a low-luminosity accretion disk. The light
curves reveal no indications of an eclipse near the phases of the upper and lower conjunctions in quiescence or in active
states during the observed intervals. We conclude that the optical star in the close binary V1341 Cyg = Cyg X-2 is a red giant
rather than a blue straggler. We studied the longterm variability of the binary during the seven years covered by our observations.
The optical observations presented in this study are compared to X-ray data from the Ginga observatory for the same time intervals. 相似文献
70.
M. G. Revnivtsev S. Yu. Sazonov S. V. Molkov A. A. Lutovinov E. M. Churazov R. A. Sunyaev 《Astronomy Letters》2006,32(3):145-148
This paper belongs to a series of papers devoted to a hard X-ray survey of the sky. We analyze a large set of observations of the Galactic plane region in Crux with the IBIS telescope onboard the INTEGRAL observatory. We have detected 47 sources. There are 12 active galactic nuclei and 11 and 6 galactic binary systems with high-mass and low-mass optical companions, respectively, among the identified objects. Thirteen objects remain unidentified. 相似文献