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10 papers · 2 filters
Improvements in the M-T relation and mass function and the measured Omega_m through clusters evolution
A. Del Popolo
In this paper, I revisit the constraints obtained by several authors (Reichart et al. 1999; Eke et al. 1998; Henry 2000) on the estimated values of Omega_m, n and sigma_8 in the li…
Birth rates of different types of neutron star and possible evolutions of these objects
Oktay H. Guseinov, Askin Ankay, Sevinc O. Tagieva
We estimate the spatial densities of different types of neutron star near the Sun. It is shown that the distances of dim isolated thermal neutron stars must be on average about 300…
Thin Disk Models of Anomalous X-ray Pulsars
K. Yavuz Ekşi, M. Ali Alpar
We discuss the options of the fall-back disk model of Anomalous X-Ray Pulsars (AXPs). We argue that the power-law index of the mass inflow rate during the propeller stage can be lo…
Can Thin Disks Produce Anomalous X-Ray Pulsars?
K. Yavuz Eksi, M. Ali Alpar
We investigate whether young neutron stars with fall-back disks can produce Anomalous X-Ray Pulsars (AXPs) within timescales indicated by the ages of associated supernova remnants.…
Planetary migration in evolving planetesimals discs
S. Yesilyurt, A. Del Popolo, N. Ercan
In the current paper, we further improved the model for the migration of planets introduced in Del Popolo et al. (2001) and extended to time-dependent planetesimal accretion disks…
Axion searches at CERN with the CAST Telescope
C. Eleftheriadis et al
The CERN Axion Solar Telescope (CAST) searches for axions coming from photon to axion conversion in the sun's core, as stated by the Primakoff effect. Axions arise in particle phys…
Numerical tests of dynamical friction in gravitational inhomogeneous systems
A. Del Popolo
In this paper, I test by numerical simulations the results of Del Popolo & Gambera (1998),dealing with the extension of Chandrasekhar and von Neumann's analysis of the statistics o…
Effects of the background radiation on radio pulsar and supernova remnant searches and the birth rates of these objects
Askin Ankay, Oktay H. Guseinov, Sevinc O. Tagieva
In different directions of the Galaxy the Galactic background radio radiation and radiation of complex star formation regions which include large number of OB associations have dif…
The Relation Between the Surface Brightness and the Diameter for Galactic Supernova Remnants
Oktay H. Guseinov, Askin Ankay, Aytap Sezer +1
In this work, we have constructed a relation between the surface brightness () and diameter (D) of Galactic C- and S-type supernova remnants (SNRs). In order to calibrate the $Σ…
Evolution of planetesimal discs and planets migration
A. Del Popolo, S. Yesilyurt, N. Ercan
In this paper, we further develop the model for the migration of planets introduced in Del Popolo, Gambera and Ercan, and extended to time-dependent planetesimal accretion disks in…