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1,018 results on '"Gurevich M"'

3. Search for RR Lyrae stars in DES ultra-faint systems: Grus I, Kim 2, Phoenix II, and Grus II

Author

Martínez-Vázquez, C. E., Vivas, A. K., Gurevich, M., Walker, A. R., McCarthy, M., Pace, A. B., Stringer, K. M., Santiago, B., Hounsell, R., Macri, L., Li, T. S., Bechtol, K., Riley, A. H., Kim, A. G., Simon, J. D., Drlica-Wagner, A., Nadler, E. O., Marshall, J. L., Annis, J., Avila, S., Bertin, E., Brooks, D., Buckley-Geer, E., Burke, D. L., Rosell, A. Carnero, Kind, M. Carrasco, da Costa, L. N., De Vicente, J., Desai, S., Diehl, H. T., Doel, P., Everett, S., Frieman, J., García-Bellido, J., Gaztanaga, E., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hollowood, D. L., Honscheid, K., James, D. J., Kuehn, K., Kuropatkin, N., Maia, M. A. G., Menanteau, F., Miller, C. J., Miquel, R., Paz-Chinchón, F., Plazas, A. A., Sanchez, E., Scarpine, V., Serrano, S., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Swanson, M. E. C., Tarle, G., and Vikram, V.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
Abstract

This work presents the first search for RR Lyrae stars (RRLs) in four of the ultra-faint systems imaged by the Dark Energy Survey (DES) using SOAR/Goodman and Blanco/DECam imagers. We have detected two RRLs in the field of Grus I, none in Kim 2, one in Phoenix II, and four in Grus II. With the detection of these stars, we accurately determine the distance moduli for these ultra-faint dwarf satellite galaxies; $\mu_0$=20.51$\pm$0.10 mag (D$_{\odot}$=127$\pm$6 kpc) for Grus I and $\mu_0$=20.01$\pm$0.10 mag (D$_{\odot}$=100$\pm$5 kpc) for Phoenix II. These measurements are larger than previous estimations by Koposov et al. 2015 and Bechtol et al. 2015, implying larger physical sizes; 5\% for Grus I and 33\% for Phoenix II. For Grus II, out of the four RRLs detected, one is consistent with being a member of the galactic halo (D$_\odot$=24$\pm$1 kpc, $\mu_0$=16.86$\pm$0.10 mag), another is at D$_\odot$=55$\pm$2 kpc ($\mu_0$=18.71$\pm$0.10 mag), which we associate with Grus II, and the two remaining at D$_\odot$=43$\pm$2 kpc ($\mu_0$=18.17$\pm$0.10 mag). Moreover, the appearance of a subtle red horizontal branch in the color-magnitude diagram of Grus II at the same brightness level of the latter two RRLs, which are at the same distance and in the same region, suggests that a more metal-rich system may be located in front of Grus II. The most plausible scenario is the association of these stars with the Chenab/Orphan Stream. Finally, we performed a comprehensive and updated analysis of the number of RRLs in dwarf galaxies. This allows us to predict that the method of finding new ultra-faint dwarf galaxies by using two or more clumped RRLs will work only for systems brighter than M$_V\sim-6$ mag., Comment: 17 pages, 10 figures, 7 tables. Accepted for publication in MNRAS

Published
2019
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4. Possibility of suppression of the formation of solute-enriched clusters

Author

Subbotin, A. V., Gurevich, M. I., Kovalishin, A. A., and Likhomanova, P. A.

Subjects
Condensed Matter - Materials Science
Abstract

Based on the earlier proposed mechanism of formation of solute-enriched clusters in irradiated pressure vessel steels, it has been demonstrated that it is possible to suppress this process by the method of light alloying of PVS with a chemical element with specially selected properties such as solubility, activity, and mobility. It is shown that it is possible to change the thermal spike molten zone solidification mechanism and suppress the "solute drag" leading to the formation of solute-enriched clusters. It must be noted that such a solute-enriched cluster formation mechanism is appropriate for alloying elements with low solubilities - it fits for B.C.C. steel-metal of PVS, but does not for the F.C.C. austenitic steels.

Published
2019

10. Measurement of spin-dependent total cross-section difference $\Delta\sigma_T$ in neutron-proton scattering at 16 MeV

Author

Broz, J., Cerny, J., Dolezal, Z., Jirasek, G. M. Gurevich M., Kubik, P., Lukhanin, A. A., Svejda, J., Wilhelm, I., Borisov, N. S., Khachaturov, Yu. M. Kazarinov B. A., Kuzmin, E. S., Matafonov, V. N., Neganov, A. B., Pisarev, I. L., Plis, Yu. A., Usov, Yu. A., Rotter, M., and Sedlak, B.

Subjects
Nuclear Experiment
Abstract

A new measurement of $\Delta\sigma_T$ for polarized neutrons transmitted through a polarized proton target at 16.2 MeV has been made. A polarized neutron beam was obtained from the $^{3}\rm{H}(d,\vec n)^{4}\rm{He}$ reaction; proton polarization over 90\% was achieved in a frozen spin target of 20 cm$^3$ volume. The measurement yielded the value $\Delta\sigma_T=(-126\pm21\pm14)$ mb. The result of a simple phase shift analysis for the $^3S_1-^3D_1$ mixing parameter $\epsilon_1$ is presented and compared with the theoretical potential model predictions., Comment: 17 pages, 8 ps figures, available at http://www.troja.mff.cuni.cz/~dolezal/dstprep.html

Published
1995
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21. The Housing Question of Young Families in Cheliabinsk

Author

Gurevich, M. A. and Radilovskaia, T. Iu

Abstract

In the city's target program to implement the national project "Accessible and Comfortable Housing for the Citizens of Russia," in Cheliabinsk a great deal of attention is being focused on supplying young families with housing. The financing of the program for 2006 to 2010 comes to 17,884,000 rubles, provided from city, oblast, and federal budgets and from nonbudget sources. The subprogram "Housing for Young Families" calls for 64 million rubles in 2006 and 140 million rubles in 2007. Despite the relatively optimistic indicators of official statistics in Cheliabinsk, the housing problems of young people continue to be acute. In October 2005, at the directive of the city's Administration for Youth Affairs, a repeat sociological survey was conducted to study the extent to which young families are being provided with housing. The focus was on the actual availability of housing for young people in Cheliabinsk, their opinions about the prospects of improving their housing conditions, and their assessments of the assistance provided by the authorities to families in need. A comparative analysis was made of changes in the respondents' assessments of the provision of housing in the past six years. The total number of people surveyed was 1,025, 58% women and 42% men. A total of 26% were age 20 and below; 35% were between 21 and 29; and 39% were between 30 and 35. The purpose of this article is to analyze the survey results, discuss the situation of young families' housing, and explore the dynamics of changes and the prospects of those who need housing, along with ways to solve the concomitant problems. (Contains 3 tables.)

Published
2009
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31. Status of PERST-5 package

Author

Gomin, E. A., Gurevich, M. I., Kalugin, M. A., Lazarenko, A. P., Pryanichnikov, A. V., Sidorenko, V. D., Druzhinin, V. E., Zhirnov, A. P., and Rozhdestvenskiy, I. M.

Published
2012
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32. The status of MCU-5

Author

Alekseev, N. I., Bol’shagin, S. N., Gomin, E. A., Gorodkov, S. S., Gurevich, M. I., Kalugin, M. A., Kulakov, A. S., Marin, S. V., Novosel’tsev, A. P., Oleynik, D. S., Pryanichnikov, A. V., Sukhino-Khomenko, E. A., Shkarovskiy, D. A., and Yudkevich, M. S.

Published
2012
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