Long term variability of Cygnus X-1: VII. Orbital variability of the focussed wind in Cyg X-1 / HDE 226868 system

Binary systems with an accreting compact object are a unique chance to investigate the strong, clumpy, line-driven winds of early type supergiants by using the compact object's X-rays to probe the wind structure. We analyze the two-component wind of HDE 226868, the O9.7Iab giant companion of the black hole Cyg X-1 using 4.77 Ms of RXTE observations of the system taken over the course of 16 years. Absorption changes strongly over the 5.6 d binary orbit, but also shows a large scatter at a given orbital phase, especially at superior conjunction. The orbital variability is most prominent when the black hole is in the hard X-ray state. Our data are poorer for the intermediate and soft state, but show signs for orbital variability of the absorption column in the intermediate state. We quantitatively compare the data in the hard state to a toy model of a focussed Castor-Abbott-Klein-wind: as it does not incorporate clumping, the model does not describe the observations well. A qualitative comparison to a simplified simulation of clumpy winds with spherical clumps shows good agreement in the distribution of the equivalent hydrogen column density for models with a porosity length on the order of the stellar radius at inferior conjunction; we conjecture that the deviations between data and model at superior conjunction could be either due to lack of a focussed wind component in the model or a more complicated clump structure.Comment: proposed for acceptance in A&A, 11 pages, 11 figures (two in appendix

Q-phonon description of low lying 1^- two-phonon states in spherical nuclei

The properties of 1^-_1 two-phonon states and the characteristics of E1 transition probabilities between low-lying collective states in spherical nuclei are analysed within the Q-phonon approach to the description of collective states. Several relations between observables are obtained. Microscopic calculations of the E1 0^+_1 -> 1^-_1 transition matrix elements are performed on the basis of the RPA. A satisfactory description of the experimental data is obtained.Comment: 16 pages, 2 figures, 9 table

Vela X-1 as a laboratory for accretion in High-Mass X-ray Binaries

Vela X-1 is an eclipsing high mass X-ray binary (HMXB) consisting of a 283s accreting X-ray pulsar in a close orbit of 8.964 days around the B0.5Ib supergiant HD77581 at a distance of just 2.4 kpc. The system is considered a prototype of wind-accreting HMXB and it has been used as a baseline in different theoretical or modelling studies. We discuss the observational properties of the system and the use of the observational data as laboratory to test recent developments in modelling the accretion process in High-Mass X-ray Binaries (e.g., Sander et al. 2018; El Mellah et al. 2018), which range from detailed descriptions of the wind acceleration to modelling of the structure of the flow of matter close to the neutron star and its variations.Comment: 4 pages, 2 figures, proceedings of the 12th INTEGRAL conference "INTEGRAL looks AHEAD to Multimessenger astronomy" in Geneva (Switzerland) on 11-15 February 201

L-Drawings of Directed Graphs

We introduce L-drawings, a novel paradigm for representing directed graphs aiming at combining the readability features of orthogonal drawings with the expressive power of matrix representations. In an L-drawing, vertices have exclusive $x$- and $y$-coordinates and edges consist of two segments, one exiting the source vertically and one entering the destination horizontally. We study the problem of computing L-drawings using minimum ink. We prove its NP-completeness and provide a heuristics based on a polynomial-time algorithm that adds a vertex to a drawing using the minimum additional ink. We performed an experimental analysis of the heuristics which confirms its effectiveness.Comment: 11 pages, 7 figure

Morphological Criteria for Diagnosis of Pulmonary Lesions of Lungs in Tumors Based on Resection Material

Morphological criteria of diagnosis of dust lesions of lungs in tumors on resectionmaterial are considered in the article. It is shown that the complex application of various research methods allows the identification of dust particles in the lung and lymph node tissues, and contributes to the improvement of the diagnosis of dust lesions of the respiratory system. Morphological characteristics of bauxite pneumoconiosis in primary lung cancer on resection material are presented

Algorithm of morphological diagnostics of small cell lung cancer on bronchial biopsy

Results of cytologicai, histological and immunohistochemical analyses of bronchial biopsies of 95 patients with small cell lung cancer have been provided in this paper. In 85.3% of the cases small cell lung cancer within optic level has been verified by complex cytologicai and histological diagnosis. In the rest of 14.7% of the cases it has been revealed the necessity of using additional analysis methods to detect a version of small cell lung cancer. In 24 cases immunohistochemical analysis has been made, in 10 of them - to confirm morphological diagnosis of small cell lung cancer, in 14 of them - to detect a version of small cell lung tumour by using different antibodies sets depending on differentially diagnostic series. Immunohistochemical analysis has shown that 20 tumours have immunophenotype of small cell lung cancer, trustworthy lung adenocarcinoma, diffuse large cell В-cell lymphoma and mammary gland carcinoma. It has been worked out an algorithm of complex histological, cytologicai and immunohistochemical methods of diagnostics. Using it allows to improve diagnostics of small cell lung cancer on data of bronchial biopsies.В работе приведены результаты цитологического, гистологического и иммуногистохимического исследований биопсий бронхов 95 больных с мелкоклеточными опухолями легких. В 85,3% случаев достоверно верифицирован мелкоклеточный рак легкого на светооптическом уровне при помощи комплексного цитологического и гистологического исследования, в оставшихся 14,7% случаев выявлена необходимость проведения дополнительных методов исследования для определения варианта мелкоклеточных опухолей легких. В 24 случаях проведено иммуногистохимическое исследование, в 10 случаях - для подтверждения морфологического диагноза мелкоклеточного рака легкого, в 14 — для определения варианта мелкоклеточной опухоли легкого с использованием различных наборов антител в зависимости от дифференциально-диагностическо ряда. В результате иммуногистохимического исследования выявлено, что 20 опухолей имеют иммунофенотип мелкоклеточного рака легкого, оставшиеся четыре мелкоклеточные опухоли — иммунофенотип мелкоклеточного варианта плоскоклеточного рака легкого, низкодифференцированной аденокарциномы легкого солидного строения, крупноклеточной В-клеточной лимфомы и карциномы молочной железы. Сформулирован алгоритм комплексного гистологического, цитологического и иммуногистохимического методов исследования, использование которого позволяет оптимизировать диагностику мелкоклеточного рака легкого по данным биопсий бронхов

NuSTAR and Suzaku observations of the hard state in Cygnus X-1: locating the inner accretion disk

We present simultaneous Nuclear Spectroscopic Telescope Array (NuSTAR ) and Suzaku observations of the X-ray binary Cygnus X-1 in the hard state. This is the first time this state has been observed in Cyg X-1 with NuSTAR, which enables us to study the reflection and broad-band spectra in unprecedented detail. We confirm that the iron line cannot be fit with a combination of narrow lines and absorption features, and instead requires a relativistically blurred profile in combination with a narrow line and absorption from the companion wind. We use the reflection models of Garcia et al. (2014) to simultaneously measure the black hole spin, disk inner radius, and coronal height in a self-consistent manner. Detailed fits to the iron line profile indicate a high level of relativistic blurring, indicative of reflection from the inner accretion disk. We find a high spin, a small inner disk radius, and a low source height, and rule out truncation to greater than three gravitational radii at the 3{\sigma} confidence level. In addition, we find that the line profile has not changed greatly in the switch from soft to hard states, and that the differences are consistent with changes in the underlying reflection spectrum rather than the relativistic blurring. We find that the blurring parameters are consistent when fitting either just the iron line or the entire broad-band spectrum, which is well modelled with a Comptonized continuum plus reflection model.Comment: 12 pages, 7 figures, accepted for publication in Ap