Application of complex acoustic signals in the long-range navigation of underwater objects     

V. A. Akulichev  A. E. Borodin  A. V. Burenin  Yu. N. Morgunov  D. S. Strobykin 《Doklady Earth Sciences》2007,417(9):1432-1435

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On the variability of afterglows from cosmic gamma-ray bursts—the possibility of a transition to a nonrelativistic motion     

R. A. Burenin 《Astronomy Letters》2007,33(12):804-806

Variability on time scales δt < t is observed on numerous occasions in the afterglows of cosmic gamma-ray bursts (GRBs). It is well known that the radiation originating in an external shock produced by the interaction of an ultrarelativistic jet with the ambient interstellar medium should not contain such variability within the framework of simple models. The corresponding constraints were established by Ioka et al. (2005) and, in some instances, are inconsistent with observations. On the other hand, if the motion is not relativistic, then the rapid afterglow variability can be explained much more easily. Various estimates of the transition time to a nonrelativistic motion in a GRB source are discussed in this connection. It has been shown that this transition should occur on an observed time scale of ～10 days. In the case of a higher density of the surrounding material, ～10²?10⁴ cm^?3, or a stellar wind with ? ～ 10^?5?10^?4 M _⊙ yr^?1, the transition to a nonrelativistic motion can occur on a time scale of ～1 day. Such densities may well be expected in star-forming regions and around massive Wolf-Rayet stars.  相似文献   

Optical and X-ray observations of thermonuclear bursts from GS 1826-24 during September–October 2003     

A. V. Mescheryakov  I. M. Khamitov  M. G. Revnivtsev  R. A. Burenin  M. R. Gilfanov  N. N. Pavlinsky  R. A. Sunyaev  Z. Aslan  E. Gogush 《Astronomy Letters》2004,30(11):751-758

The results of optical (the RTT-150 telescope) and X-ray (the RXTE observatory) observations of the burster GS 1826-24 are presented. Emphasis was placed on analyzing the emissions during thermonuclear bursts. The results obtained allowed the size of the accretion disk in GS 1826-24 and the inclination of this binary to be estimated.  相似文献   

Interstellar extinction toward the ultradeep Galactic field of the Chandra observatory from 2MASS data     

M. G. Revnivtsev  R. A. Burenin  S. Yu. Sazonov 《Astronomy Letters》2009,35(5):305-310

We have measured the interstellar extinction in the region of ultradeep Galactic-field observations by the Chandra telescope (l ^II, b ^II) ≈ 0.1–1.42 using photometric data from the 2MASS infrared allsky survey. The angular resolution of our interstellar extinction map is 1′.8. We show that the interstellar extinction has a minimum, A _V ～ 3.4, near the center of the Chandra field of view and increases to A _V ～ 5.8–6 at the edge of the field of view. In addition, we show that the bulk of the extinction is gained in the Galactic disk and is approximately the same for all bulge stars. Our results will be subsequently used to process the Chandra data and to estimate the properties of the stellar population in this region.  相似文献   

New active galactic nuclei among the INTEGRAL and SWIFT X-ray sources     

R. A. Burenin  A. V. Mescheryakov  M. G. Revnivtsev  S. Yu. Sazonov  I. F. Bikmaev  M. N. Pavlinsky  R. A. Sunyaev 《Astronomy Letters》2008,34(6):367-374

We present the results of our optical identifications of a set of X-ray sources from the INTEGRAL and SWIFT all-sky surveys. The optical data have been obtained with the 1.5-m Russian-Turkish Telescope (RTT-150). Nine X-ray sources have been identified with active galactic nuclei (AGNs). Two of them are located in the nearby spiral galaxies MCG-01-05-047 and NGC 973 seen almost edge-on. One source, IGR J16562-3301, is probably a BL Lac object (blazar). The remaining AGNs are observed as the starlike nuclei of spiral galaxies whose spectra exhibit broad emission lines. The relation between the hard X-ray (17–60 keV) luminosity and the [O III] 5007 line luminosity, log L _x/L _{[O III]} ≈ 2.1, holds good for most of the AGNs detected in hard X rays. However, the luminosities of some AGNs deviate from this relation. The fraction of such objects can reach ～20%. In particular, the [O III] line flux is lower for two nearby edge-on spiral galaxies. This can be explained by the effect of absorption in the galactic disks.  相似文献   

Optical identifications of five INTEGRAL hard X-ray sources in the Galactic plane     

I. F. Bikmaev  R. A. Burenin  M. G. Revnivtsev  S. Yu. Sazonov  R. A. Sunyaev  M. N. Pavlinsky  N. A. Sakhibullin 《Astronomy Letters》2008,34(10):653-663

The results of optical identifications of five hard X-ray sources in the Galactic plane from the INTEGRAL all-sky survey are presented. The X-ray data on one source (IGR J20216+4359) are published for the first time. The optical observations were performed with the 1.5-m RTT-150 telescope (Turkish National Observatory, Antalya, Turkey) and the 6-m BTA telescope (Special Astrophysical Observatory, Nizhny Arkhyz, Russia). A blazar, three Seyfert galaxies, and a high-mass X-ray binary are among the identified sources.  相似文献   

Spectroscopic Redshift Determination for a Sample of Distant Quasars Detected by the SRG Observatory Based on RTT-150 Observations. II     

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   

Spectroscopic Redshift Measurements for Galaxy Clusters from the Lockman Hole Survey with the eROSITA Telescope Onboard the SRG Observatory     

Zaznobin  I. A.  Burenin  R. A.  Lyapin  A. R.  Khorunzhev  G. A.  Afanasiev  V. L.  Grokhovskaya  A. A.  Dodonov  S. N.  Eselevich  M. V.  Uklein  R. I.  Bikmaev  I. F.  Khamitov  I. M.  Gilfanov  M. R.  Lyskova  N. S.  Medvedev  P. S.  Sunyaev  R. A. 《Astronomy Letters》2021,47(3):141-149

Astronomy Letters - We present the first results of our program of optical observations for galaxy clusters from the Lockman Hole X-ray survey with the eROSITA telescope onboard the SRG space...  相似文献   

Optical Spectroscopy of SRG/eROSITA Objects with 2.5-m Telescope at the Caucasus Mountain Observatory of the SAI MSU     

Dodin  A. V.  Potanin  S. A.  Shatsky  N. I.  Belinski  A. A.  Atapin  K. E.  Burlak  M. A.  Egorov  O. V.  Tatarnikov  A. M.  Postnov  K. A.  Belvedersky  M. I.  Burenin  R. A.  Gilfanov  M. R.  Medvedev  P. S.  Meshcheryakov  A. V.  Sazonov  S. Yu.  Khorunzhev  G. A.  Sunyaev  R. A. 《Astronomy Letters》2020,46(7):429-438

Astronomy Letters - Based on observations with the new transient double-beam spectrograph (TDS) at the 2.5-m telescope of the Caucasus Mountain Observatory of SAI MSU, we have determined the types...  相似文献   

Redshift Measurements for Galaxies in Clusters by Multislit Spectroscopy at the 1.5-m Telescope RTT150     

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