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Column Densities Towards Three Bursting Low-Mass X-ray Binaries from High Resolution X-ray Spectroscopy
Patricia Wroblewski, Tolga Guver, Feryal Ozel
We measured the galactic hydrogen column densities to the neutron-star binaries GX 17+2, 4U 1705-44, and 4U 1728-34 by modeling the Mg and Si absorption edges found in high-resolut…
Multi-Band Analysis of Abell 2255
M. Hudaverdi, E. N. Ercan, A. Mert-Ankar +6
We analyzed the data for the nearby cluster of galaxies Abell 2255 from archival XMM-Newton observations in order to search for the properties of X-ray point like structures in the…
The Magnetic Fields of Anomalous X-ray Pulsars
Feryal Ozel, Tolga Guver, Ersin Gogus
Anomalous X-ray Pulsars (AXPs) belong to a class of neutron stars believed to harbor the strongest magnetic fields in the universe, as indicated by their energetic bursts and their…
Physical Properties of the AXP 4U 0142+61 from X-ray Spectral Analysis
Tolga Guver, Feryal Ozel, Ersin Gogus
We analyze archival Chandra and XMM-Newton data of 4U 0142+61 within the context of the Surface Thermal Emission and Magnetospheric Scattering model. We show that 4U 0142+61 spectr…
Inferring the Magnetic Fields of Magnetars from their X-ray Spectra
Tolga Guver, Feryal Ozel, Maxim Lyutikov
We present the first self-consistent theoretical models of magnetar spectra that take into account the combined effects of the stellar atmosphere and its magnetosphere. We find tha…
Galactic model parameters for field giants separated from field dwarfs by their 2MASS and V apparent magnitudes
S. Bilir, S. Karaali, T. Guver +2
We present a procedure which separates field dwarfs and field giants by their 2MASS and V apparent magnitudes. The procedure is based on the spectroscopically selected standards, h…