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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…
The Redshift Evolution of the Tully-Fisher Relation as a Test of Modified Gravity
Christopher Limbach, Dimitrios Psaltis, Feryal Ozel
The redshift evolution of the Tully-Fisher Relation probes gravitational dynamics that must be consistent with any modified gravity theory seeking to explain the galactic rotation…
What Makes an Accretion-Powered Millisecond Pulsar?
Feryal Ozel
We investigate the dependence of pulse amplitudes of accreting millisecond pulsars on the masses of the neutron stars. Because the pulsation amplitudes are suppressed as the neutro…
Biases for neutron-star mass, radius and distance measurements from Eddington-limited X-ray bursts
Duncan Galloway, Feryal Ozel, Dimitrios Psaltis
Eddington-limited X-ray bursts from neutron stars can be used in conjunction with other spectroscopic observations to measure neutron star masses, radii, and distances. In order to…
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…