Search Publications
Hydrogenated fullerenes (fulleranes) in space
Zhang, Yong; Hsia, Chih-Hao; Sadjadi, Seyedabdolreza
Since the first laboratory synthesis of C60 in 1985, fullerene-related species have been proposed to interpret various astronomical features. After more than 25 years' efforts, several circumstellar and interstellar features have been convincingly assigned to C60, C70, and C
Investigation of ionospheric TEC anomalies caused by space weather conditions
Alcay, Salih; Gungor, Merve
This study examines the influence of space weather conditions on ionospheric TEC variations at different latitudes around the world. According to the space weather condition indices (geomagnetic storm-activity indices, solar activity indices, magnetic field change indices, plasma density and proton flux indices) different time periods were chosen.…
Dipolar and Kelvin-Stuart's cat's eyes vortices in magnetoplasmas with non-Maxwellian electron distribution
Masood, W.; Naeem, Ismat; Mirza, Arshad M.
Linear and nonlinear propagation characteristics of drift ion acoustic waves are analyzed in an inhomogeneous plasma comprising of warm ions having shear flow parallel to the magnetic field and electrons that are followed by a distribution which is dictated by spectral indices,
New H I observations of KK 69. Is KK 69 a dwarf galaxy in transition?
Koribalski, B. S.; Benaglia, P.; Saponara, J. +1 more
We present new H I data of the dwarf galaxy KK 69, obtained with the Giant Metrewave Radio Telescope (GMRT) with a signal-to-noise ratio almost double previous observations. We carried out a Gaussian spectral decomposition and stacking methods to identify the cold neutral medium (CNM) and the warm neutral medium (WNM) of the H I gas. We found that…
Exhaustive study of three-time periods of solar activity due to single active regions: sunspot, flare, CME, and geo-effectiveness characteristics
Soni, Shirsh Lata; Yadav, Manohar Lal; Gupta, Radhe Syam +1 more
In this paper, we present the multi-wavelength study of a high level of solar activity during which a single active region produced multiple flares/CMEs. According to the sunspot observations, the current solar cycle 24 manifest to be less intense in comparison with the previous recent sunspot cycles. In the course of the current sunspot cycle 24,…
A GALEX far-ultraviolet study of quasi-coeval samples of red giants
Smith, Graeme H.; Cochrane, Kevin M.
Samples of red giant branch (RGB) stars have been compiled from the literature for seven moving groups, and searches made for both GALEX FUV and Johnson
The compound stream event of March 20-25, 2011 as measured by the STEREO B spacecraft
Morgan, Huw; Al-Shakarchi, Duraid A.
The interaction of interplanetary coronal mass ejections (ICME) with each other and with co-rotating interaction regions (CIR) changes their configuration, dynamics, magnetic field and plasma characteristics and can make space weather forecasting difficult. During the period of March 20–25, 2011, the Solar Terrestrial Relation Observatory (STEREO …
Characterizing some Gaia Alerts with LAMOST and SDSS
Liu, X.; Pursimo, T.; Dennefeld, M. +2 more
The ESA-Gaia satellite is regularly producing Alerts on objects where photometric variability has been detected after several passages over the same region of the sky. The physical nature of these objects has often to be determined with the help of complementary observations from ground-based facilities. We have compared the list of Gaia Alerts (f…
Virial models and anisotropy of velocity dispersion in E-galaxies
Kondratyev, B. P.; Kireeva, E. N.
A tensor virial approach is used to construct detailed models of 22 flattened ellipticals. The models are combined with the new observational data: extended surface brightness distributions, the profiles of isophotes flattening and their twisting, the rotation curves and the velocity dispersion profiles. A key feature of these models is a rigorous…
Local dark energy in the Sculptor Filament of galaxies
Pruzhinskaya, M. V.; Karachentsev, I. D.; Chernin, A. D.
Two dozens of different mass galaxies observed at distances less than 10 Mpc from the Local Group are organized in the elongated structure known as the Sculptor Filament. We use recent Hubble Space Telescope data on local galaxies to study the dynamical structure and evolutionary trends of the filament. An N-body computer model, which reproduces i…