Showing papers in "New Astronomy in 2011"

TL;DR: In this paper, numerical simulations of the axisymmetric accretion of a massive magnetized plasma torus on a rotating black hole were presented, and the authors used a realistic equation of state, which took into account neutrino cooling and energy loss due to nucleus dissociations.

TL;DR: The photometric and spectroscopic evolution of the He/N and very fast Nova Cyg 2008 N.2 (V2491 Cyg) is studied in detail in this paper.

TL;DR: In this article, the authors focus on the most radial and the most interesting polar spicules situated at the base of the fast solar wind of coronal holes, and they use the mad-max operator to reduce these effects and improve the visibility of these hair-like features.

TL;DR: In this paper, the authors present a new gravitational galactic model, describing motion in elliptical as well as in disk galaxies, by suitably choosing the dynamical parameters, in order to detect islandic motion of resonant orbits and the evolution of the sticky regions.

TL;DR: In this paper, the authors studied the time distribution of asymmetry in the area and total number of sunspot groups over the time interval 1874-2009, and the time behavior of the asymmetry was shown to be similar on both small and large time scales.

TL;DR: In this paper, an analysis of archival X-ray observations of the Type IIL supernova SN 1979C is presented, and it is shown that its X-rays are remarkably constant at (6.5 ± 0.1) × 1038 − 1 s−1 over a period of 12 years between 1995 and 2007, which is consistent with either a supernova powered by magnetic braking of a rapidly rotating magnetar or a model where the blast wave is expanding into a dense circumstellar wind.

TL;DR: The Kepler map as mentioned in this paper is a two-dimensional area-preserving map, describing the motion of a comet in terms of energy and time, and its second equation is based on Kepler's third law.

TL;DR: In this paper, the authors investigate the method by which nearby supernovae can penetrate the solar system and deposit live radioactivities on earth, and find that supernova dust grains traverse the inner solar system nearly undeflected, if the incoming grain velocity is comparable to the solar wind speeds and much larger than the escape velocity at 1.

TL;DR: In this article, the authors employ the field-theoretic perturbative procedure due to Bender et al. to obtain analytical solutions to the nonlinear initial value problem, and find that the method allows one to construct perturbation solutions which converge rapidly to the true solutions in many cases.

TL;DR: A parallel hybrid symplectic integrator for planetary system integration that runs on a graphics processing unit (GPU) is described in this article.The integrator identifies close approaches between particles and switches from symplectic to Hermite algorithms for particles that require higher resolution integrations.

TL;DR: This work presents a solution to interactively visualize larger-than-memory 3D astronomical data cubes by utilizing a heterogeneous cluster of CPUs and GPUs.

TL;DR: In this paper, the authors examined spectral properties of the SDSS quasar J093201.60 + 31858.7, in particular the presence of strong blue peaks in the Balmer emission lines offset from the narrow lines by approximately 4200 km−s−1.

TL;DR: The authors showed that the overwhelming majority of type Ia supernovas (∼99%) in elliptical galaxies form via mergers of binary white dwarfs with a total mass exceeding the Chandrasekhar limit.

TL;DR: In this article, the exact first integral of a Lane-Emden equation of the second kind modeling a thermal explosion in a rectangular slab was studied and it was shown that there is a critical value of δ beyond which solutions do not exist.

TL;DR: In this article, the authors search for the Two Micron All Sky Survey (2MASS) counterparts of 1434 BL Lacs and compare the near-infrared (NIR) apparent magnitudes, monochromatic luminosities, and spectral indices of different subclasses of BL lacs, and investigate the correlation between NIR and gamma-ray emission using the 2MASS observational data.

TL;DR: Using the Hilbert-Huang Transform (HHT) method, Atac et al. as discussed by the authors investigated the periodicity in the monthly mean mean mean flare indices from 1966 to 2007 (corresponding to almost four complete solar cycles), calculated by T Atac and A Ozguc.

TL;DR: In this article, a filament at the periphery of an active region was observed by the Extreme Ultraviolet Imager telescope aboard the STEREO-A spacecraft, which showed up as a prominence eruption.

TL;DR: In this article, the authors present and discuss the characteristics and performance of a numerical code which integrates the equation of motions of N ‘particles interacting via Newtonian gravitation and move in an external galactic smooth field.

TL;DR: PINGS oft as mentioned in this paper is a set of IDL routines designed to visualise and manipulate, in an interactive and friendly way, integral field spectroscopic (reduced) data, optimised for large databases and a fast visualisation rendering.

TL;DR: In this paper, the Wilson-Devinney code was used to analyze the CCD light curves of the Algol type eclipsing binaries DP Cep, AL Gem, FG Gem, UU Leo, CF Tau and AW Vul.

TL;DR: In this article, Chandra X-ray non-detections of two unusual, luminous Iron Low-Ionization Broad Absorption Line Quasars (FeLoBALs) are reported.

TL;DR: In this article, the authors present the 2005-2010 outburst history of the SU UMa-type dwarf HS 0417+7445, along with a detailed analysis of extensive time-series photometry obtained in March 2008 during the second ecorded superoutburst of the system.

TL;DR: In this paper, a correlative study between the peak values of geomagnetic activity indices (Dst, Kp, ap and AE) and the peak value of various interplanetary field (Bt, Bz, E and σ B ) and plasma (T, D, V, P and β ) parameters along with their various products (BV,BzV and B 2 V) during intense geOMagnetic storms (GMSs) for rising, maximum and decay phases as well as for complete solar cycle 23.

TL;DR: In this article, the authors examined the hypothesis that a core mass function, such as the one deduced for cores in the Orion molecular cloud (OMC), could possibly be the primogenitor of the stellar initial mass function (IMF).

TL;DR: In this paper, a detailed thermal and structural analysis of a 2m class solar telescope mirror which is subjected to a varying heat load at an observatory site is presented, taking into account the heating caused by a smooth and gradual increase of the solar flux during the day-time observations and cooling resulting from the exponentially decaying ambient temperature at night.

TL;DR: In this article, the authors present an analysis of the diffuse hard X-ray emission in the core of the young massive Galactic cluster Westerlund 1 based on a 48-ks XMM-Newton observation.

TL;DR: In this paper, the authors point out that the circularity problem is not in fact a problem at all, except to the extent that it amounts to a self-inflicted wound.

TL;DR: In this article, the authors presented the study of normalized north-south asymmetry, cumulative normalized south-east asymmetry and cumulative difference indices of sunspot areas, solar active prominences and Hα solar flares from 1964 to 2008 spanning the solar cycles 20-23 and showed that in most cases the asymmetry is statistically highly significant meaning that the asymmetries are real features in the N-S distribution of solar activity features.

TL;DR: In this paper, the authors proposed that H2CC may be identified in cosmic objects through its transition 111−−110 at 4.85 GHz in anomalous absorption, i.e., the absorption against the cosmic microwave background.

TL;DR: In this article, the authors make a detailed analysis of cross-correlation and time-lag between monthly data of galactic cosmic rays (GCRs) intensity and different solar activity indices (e.g., sunspot number, sunspot area, green coronal Fe line and 10.7 cm solar radio flux) during 19-23 solar cycles.