Astrophysics and Space Science

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Probing a self-complete and Generalized-Uncertainty-Principle black hole with precessing and periodic motion
Astrophysics and Space Science - Tập 367 - Trang 1-22 - 2022
Jing Zhang, Yi Xie
We investigate the precessing and periodic orbits of timelike particles around a self-complete and Generalized-Uncertainty-Principle (GUP) black hole. After its marginally bound orbit and innermost stable circular orbit are found, we obtain the allowable conditions for the bound orbits. The relativistic periastron advance is worked out, and thereby the minimal resolution length of the GUP is estim... hiện toàn bộ
Optical flare activity in the low-mass eclipsing binary GJ 3236
Astrophysics and Space Science - Tập 361 - Trang 1-7 - 2016
Š. Parimucha, P. Dubovský, M. Vaňko, M. Čokina
We present our observations of the low-mass eclipsing binary GJ 3236. We have analyzed a phased $R_{C}$ light-curve and confirmed previously determined fundamental parameters of the components. We detected evolution of the spot(s) and found that there exists a large spot near a polar region of the primary component and another spot either on the primary or the secondary component. We also observed... hiện toàn bộ
FUSE Observations of EC14026 Stars
Astrophysics and Space Science - Tập 291 - Trang 359-366 - 2004
P. Chayer, G. Fontaine, M. Fontaine, R. Lamontagne, F. Wesemael, J. Dupuis, U. Heber, R. Napiwotzki, S. Moehler
We present a FUSE abundance analysis of EC14026 stars. We compare the abundances of heavy elements in the atmospheres of EC14026 stars to non-pulsating stars with similar atmospheric parameters, and investigate whether weak stellar winds could explain the coexistence of variable and non-variable sdB stars in the log g – Teff diagram. We also present preliminary results on time-dependent diffusion ... hiện toàn bộ
Formation of leading spiral arms in retrograde galaxy encounters
Astrophysics and Space Science - Tập 156 - Trang 205-208 - 1989
M. Thomasson, K. J. Donner, B. Sundelius, G. G. Byrd, T. -Y. Huang, M. J. Valtonen
We study, theoretically and withN-body simulations, the formation of spiral structures in retrograde galaxy encounters. A one-armed leading spiral dominates in a disc if (i) the tidal perturbation from the retrograde companion is large enough, and (ii) the disc is surrounded by a massive halo. From the literature we find that very few spirals in a sample of galaxies with a large companion have lea... hiện toàn bộ
A small-size (less than 1 min of ARC) decametric radio source in the Perseus cluster
Astrophysics and Space Science - Tập 102 - Trang 155-160 - 1984
A. V. Megn, S. Ya Braude, S. L. Rashkovski, I. S. Falkovich, N. K. Sharykin, V. A. Shepelev, A. D. Khristenko
Results of observations of decametric readio emission from the Perseus cluster with the aid of URAN-1 interferometer are presented. The 42.2 km baseline of the interferometer is oriented along the parallel. The object is shown to contain a radio source with dimensions which do not exceed 60″ and whose flux is not less than 95 Jy over the frequency range from 16.7 to 25 MHz. Several source models a... hiện toàn bộ
Damping of magnetohydrodynamic waves: A correction
Astrophysics and Space Science - Tập 47 - Trang 457-458 - 1977
R. De Bibhas
Distribution of gaps in emission line redshifts of QSOs
Astrophysics and Space Science - Tập 95 - Trang 123-129 - 1983
D. Basu
A gap in the distribution of a parameter is simply the absence of the parameter for the values corresponding to the gap. The gap in the emission line redshift (z) of QSOs thus represents absence of QSOs with emission line redshift values corresponding to the gap region. Gaps in emission line redshifts of QSOs have been analysed statistically with updated data consisting of 1549 values. The study i... hiện toàn bộ
The diffuse cosmic X-ray background spectrum in the 2–10 keV energy range
Astrophysics and Space Science - Tập 24 Số 2 - Trang 585-592 - 1973
Dawn Adams, M. J. Ricketts
‘Copernicus’ observations of extragalactic X-ray sources
Astrophysics and Space Science - Tập 42 - Trang 249-254 - 1976
A. C. Fabian, R. J. Mitchell, P. J. N. Davison, P. A. Charles, J. L. Culhane
The MSSL X-ray detectors onCopernicus have been used to study a number of extragalactic objects. At least three classes of unresolved sources are found and we suggest that accretion may be the dominant mechanism. The mass of the accreting object then determines the X-ray emission properties.
Photometric redshifts: spectroscopy AT Δλ / λ ≈ 0.1
Astrophysics and Space Science - Tập 276 - Trang 965-972 - 2001
A. FernÁndez-Soto
I discuss the advantages that photometric redshift techniques offer over traditional (spectroscopic) redshift determination methods. It is shown that the former represents the only means we have of studying the faint distant galaxy population as a whole, and that, in its range of applicability, it delivers excellent results that can add to our knowledge of galaxy formation and evolution processes.... hiện toàn bộ
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