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   

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   

Spectroscopic Redshift Measurements for Galaxy Clusters from the Planck Survey and Observations of These Clusters in the SRG/eROSITA Survey     

Zaznobin  I. A.  Burenin  R. A.  Bikmaev  I. F.  Khamitov  I. M.  Khorunzhev  G. A.  Lyapin  A. R.  Eselevich  M. V.  Lyskova  N. S.  Medvedev  P. S.  Gilfanov  M. R.  Sunyaev  R. A. 《Astronomy Letters》2021,47(2):61-70

Astronomy Letters - We present the results of our spectroscopic redshift measurements for galaxy clusters detected previously from Planck all-sky survey data as well as Sloan Digital Sky Survey and...  相似文献   

Spectroscopic Redshift Measurements for Galaxy Clusters Detected in the Planck All-Sky Survey     

Zaznobin  I. A.  Burenin  R. A.  Bikmaev  I. F.  Khamitov  I. M.  Khorunzhev  G. A.  Lyapin  A. R.  Eselevich  M. V.  Afanasiev  V. L.  Dodonov  S. N.  Sunyaev  R. A. 《Astronomy Letters》2020,46(2):79-91

Astronomy Letters - We present the results of spectroscopic redshift measurements for galaxy clusters from the catalogue compiled previously from Planck all-sky survey data in combination with...  相似文献   

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

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   

Optical Identification of Candidates for Active Galactic Nuclei Detected by the Mikhail Pavlinsky ART-XC Telescope Onboard the SRG Observatory during an All-Sky X-ray Survey     

Zaznobin  I. A.  Uskov  G. S.  Sazonov  S. Yu.  Burenin  R. A.  Medvedev  P. S.  Khorunzhev  G. A.  Lyapin  A. R.  Krivonos  R. A.  Filippova  E. V.  Gilfanov  M. R.  Sunyaev  R. A.  Eselevich  M. V.  Bikmaev  I. F.  Irtuganov  E. N.  Nikolaeva  E. A. 《Astronomy Letters》2021,47(2):71-87

Astronomy Letters - We present the results of our identification of eight objects from the preliminary catalogue of X-ray sources detected in the 4–12 keV energy band by the Mikhail Pavlinsky...  相似文献   

The high-pressure phase diagram of synthetic epsomite (MgSO4·7H2O and MgSO4·7D2O) from ultrasonic and neutron powder diffraction measurements     

E. L. Gromnitskaya  O. F. Yagafarov  A. G. Lyapin  V. V. Brazhkin  I. G. Wood  M. G. Tucker  A. D. Fortes 《Physics and Chemistry of Minerals》2013,40(3):271-285

We present an ultrasonic and neutron powder diffraction study of crystalline MgSO₄·7H₂O (synthetic epsomite) and MgSO₄·7D₂O under pressure up to ~3 GPa near room temperature and up to ~2 GPa at lower temperatures. Both methods provide complementary data on the phase transitions and elasticity of magnesium sulphate heptahydrate, where protonated and deuterated counterparts exhibit very similar behaviour and properties. Under compression in the declared pressure intervals, we observed three different sequences of phase transitions: between 280 and 295 K, phase transitions occurred at approximately 1.4, 1.6, and 2.5 GPa; between 240 and 280 K, only a single phase transition occurred; below 240 K, there were no phase transformations. Overall, we have identified four new phase fields at high pressure, in addition to that of the room-pressure orthorhombic structure. Of these, we present neutron powder diffraction data obtained in situ in the three phase fields observed near room temperature. We present evidence that these high-pressure phase fields correspond to regions where MgSO₄·7H₂O decomposes to a lower hydrate by exsolving water. Upon cooling to liquid nitrogen temperatures, the ratio of shear modulus G to bulk modulus B increases and we observe elastic softening of both moduli with pressure, which may be a precursor to pressure-induced amorphization. These observations may have important consequences for modelling the interiors of icy planetary bodies in which hydrated sulphates are important rock-forming minerals, such as the large icy moons of Jupiter, influencing their internal structure, dynamics, and potential for supporting life.  相似文献