11 research outputs found
Peculiar objects in the birthplaces of radio pulsars -- stellar-mass black hole candidates
We perform a search for stellar-mass black hole candidates in the spatial
regions with increased probability of their occurrence, isolated based on the
evolutionary scenarios for compact objects originating in disrupted binaries.
We analyze the sources located in these regions with available spectral or
photometric data, as well as measured proper motions and distances. Nine
objects that exhibit characteristics corresponding to theoretical predictions
for isolated black holes are marked for further study as black hole candidates
Searching for isolated stellar-mass black hole candidates by analyzing the kinematics of their former companions in disrupted binary systems
We performed a search for isolated stellar-mass black hole candidates based on the fact that more than 50% of radio pulsars have originated in binary systems, now disrupted, where the other component could have evolved into a black hole prior to the second supernova event in the system which caused its disruption. To this end, several relatively young isolated pulsars with known parallaxes fitting the selection criteria were traced back to their presumed birth locations. These areas were then analyzed for possible black hole candidates based on the astrometric, photometric, and spectral data available. We present the results for the first 4 pulsars in our sample, J0139+5814, J0922+0638, J0358+5413, and J1395+1616. Several possible candidates were selected for further analysis
Search for Pairs of Isolated Radio Pulsars - Components in Disrupted Binary Systems
We have developed a method for analyzing the kinematic association of
isolated relativistic objects - possible remnants of disrupted close binary
systems. We investigate pairs of fairly young radio pulsars with known proper
motions and estimated distances (dispersion measures) that are spaced no more
than 2-3 kpc apart. Using a specified radial velocity distribution for these
objects, we have constructed 100-300 thousand trajectories of their possible
motion in the Galactic gravitational field on a time scale of several million
years. The probabilities of their close encounters at epochs consistent with
the age of the younger pulsar in the pair are analyzed. When these
probabilities exceed considerably their reference values obtained by assuming a
purely random encounter between the pulsars under consideration, we conclude
that the objects may have been gravitationally bound in the past. As a result,
we have detected six pulsar pairs (J0543+2329/J0528+2200,
J1453-6413/J1430-6623, J2354+6155/J2321+6024, J1915+1009/J1909+1102,
J1832-0827/J1836-1008, and J1917+1353/J1926+1648) that are companions in
disrupted binary systems with a high probability. Estimates of their kinematic
ages and velocities at binary disruption and at the present epoch are provided
АНАЛИЗ «ЗАТРАТЫ–ЭФФЕКТИВНОСТЬ» ПРИМЕНЕНИЯ МОНТЕЛУКАСТА У ДЕТЕЙ, БОЛЬНЫХ БРОНХИАЛЬНОЙ АСТМОЙ, В УСЛОВИЯХ СИСТЕМЫ ЗДРАВООХРАНЕНИЯ РЕСПУБЛИКИ БЕЛАРУСЬ
The aim of this study was to estimate the montelukast cost-effectiveness in children with mild and moderate persistent asthma in Belarus. Patients and methods. A one-year decision tree model of asthma for a hypothetical cohort of 100 children with asthma and a lack of basic therapy or taking either montelukast or inhaled glucocorticosteroids has been constructed on the basis of the results of randomized clinical studies and local data. Results. In children older than 6 years of age the CER of fluticasone application was 2.62. In 2–6-year-old children the CER of montelukast application was 5.6, the CER of the lack of basis therapy — на «один день без ухудшений астмы, обострений, использования короткодействующих β2-агонистов» по сравнению с CER монтелукаста — 2,62, суспензии будесонида — 5,6.Заключение. В Республике Беларусь у детей в возрасте 2–6 лет с персистирующей бронхиальной астмой легкой и средней степени тяжести приоритетной тактикой лечения является использование перорального монтелукаста по сравнению с суспензией будесонида или отсутствием базисной терапии. У детей старше 6 лет, которые способны овладеть техникой ингаляции, приоритетным лекарственным средством является ингаляционный глюкокортикостероид
Searching for isolated stellar-mass black hole candidates by analyzing the kinematics of their former companions in disrupted binary systems
We performed a search for isolated stellar-mass black hole candidates based on the fact that more than 50% of radio pulsars have originated in binary systems, now disrupted, where the other component could have evolved into a black hole prior to the second supernova event in the system which caused its disruption. To this end, several relatively young isolated pulsars with known parallaxes fitting the selection criteria were traced back to their presumed birth locations. These areas were then analyzed for possible black hole candidates based on the astrometric, photometric, and spectral data available. We present the results for the first 4 pulsars in our sample, J0139+5814, J0922+0638, J0358+5413, and J1395+1616. Several possible candidates were selected for further analysis
Searching for isolated stellar-mass black hole candidates by analyzing the kinematics of their former companions in disrupted binary systems
We performed a search for isolated stellar-mass black hole candidates based on the fact that more than 50% of radio pulsars have originated in binary systems, now disrupted, where the other component could have evolved into a black hole prior to the second supernova event in the system which caused its disruption. To this end, several relatively young isolated pulsars with known parallaxes fitting the selection criteria were traced back to their presumed birth locations. These areas were then analyzed for possible black hole candidates based on the astrometric, photometric, and spectral data available. We present the results for the first 4 pulsars in our sample, J0139+5814, J0922+0638, J0358+5413, and J1395+1616. Several possible candidates were selected for further analysis
Searching for isolated stellar-mass black hole candidates by analyzing the kinematics of their former companions in disrupted binary systems
We performed a search for isolated stellar-mass black hole candidates based on the fact that more than 50% of radio pulsars have originated in binary systems, now disrupted, where the other component could have evolved into a black hole prior to the second supernova event in the system which caused its disruption. To this end, several relatively young isolated pulsars with known parallaxes fitting the selection criteria were traced back to their presumed birth locations. These areas were then analyzed for possible black hole candidates based on the astrometric, photometric, and spectral data available. We present the results for the first 4 pulsars in our sample, J0139+5814, J0922+0638, J0358+5413, and J1395+1616. Several possible candidates were selected for further analysis