Demet Kırmızıbayrak
A5035873882- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- High-pressure geophysics and materials
- Geophysics and Sensor Technology
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Mechanics and Biomechanics Studies
- Astrophysics and Cosmic Phenomena
- Advanced MEMS and NEMS Technologies
- Superconducting Materials and Applications
- Advanced Sensor Technologies Research
- Astronomical Observations and Instrumentation
- Seismology and Earthquake Studies
- Planetary Science and Exploration
- Geological and Geophysical Studies
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Inertial Sensor and Navigation
University of British Columbia
2020-2024
Compact Imaging (United States)
2023
Sabancı Üniversitesi
2017
We report on the first detection of linearly polarized x-ray emission from an ultra-magnetized neutron star with Imaging X-ray Polarimetry Explorer (IXPE). The IXPE 35 observations anomalous pulsar 4U 0142+61 reveal a linear polarization degree $(12\pm 1)\%$ throughout 2--8 keV band. detect substantial variation energy: is $(14\pm at 2--4 and $(41\pm 7)\%$ 5.5--8 keV, while it drops below instrumental sensitivity around 4--5 where angle swings by $\sim 90^\circ$. give us completely new...
ABSTRACT We report on IXPE, NICER, and XMM–Newton observations of the magnetar 1E 2259+586. find that source is significantly polarized at about or above 20 per cent for all phases except secondary peak where it more weakly polarized. The polarization degree strongest during primary minimum which also phase an absorption feature has been identified previously. angle photons are consistent with a rotating vector model mode switch between rest rotation neutron star. propose scenario in...
<title>Abstract</title> In an X-ray pulsar, a neutron star accretes matter from stellar companion through accretion disk. The high magnetic field of the rotating disrupts inner edge disc, funneling gas to flow onto poles on its surface. Hercules X-1 is in many ways prototypical pulsar; it shows persistent emission and resides with HZ Her, two-solar-mass star, at about 7~kpc Earth<sup>1</sup>. Its varies three distinct timescales<sup>2</sup> rotates every 1.2~seconds, eclipsed by each...
We report on IXPE, NICER and XMM-Newton observations of the magnetar 1E 2259+586. find that source is significantly polarized at about or above 20% for all phases except secondary peak where it more weakly polarized. The polarization degree strongest during primary minimum which also phase an absorption feature has been identified previously (Pizzocaro et al. 2019). angle photons are consistent with a rotating vector model mode switch between rest rotation neutron star. propose scenario in...
Abstract We present our broadband (2–250 keV) time-averaged spectral analysis of 388 bursts from SGR J1550−5418, 1900+14, and 1806−20 detected with the Rossi X-ray Timing Explorer ( RXTE ) here as a database in companion web-catalog. find that two blackbody functions (BB+BB), sum modified (LB+LB), function power-law (BB+PO), power law high-energy exponential cutoff (COMPT) all provide acceptable fits at similar levels. performed numerical simulations to constrain best fitting model for each...
We present a phase-dependent analysis of the polarized emission from Crab pulsar based on three sets observations by Imaging X-ray Polarimetry Explorer (IXPE). found that phenomenological model involving simple linear transformation Stokes parameters adequately describes IXPE data. This enables us to establish, for first time, connection between polarization properties in optical and soft bands, suggesting common underlying mechanism across these bands. In particular, degree X-rays pure...
In an accreting X-ray pulsar, a neutron star accretes matter from stellar companion through accretion disk. The high magnetic field of the rotating disrupts inner edge disc, funneling gas to flow onto poles on its surface. Hercules X-1 is in many ways prototypical pulsar; it shows persistent emission and resides with HZ Her, two-solar-mass star, at about 7~kpc Earth. Its varies three distinct timescales: rotates every 1.2~seconds, eclipsed by each 1.7~days, system exhibits superorbital...
Compact objects and supernova remnants provide nearby laboratories to probe the fate of stars after they die, way impact, are impacted by, their surrounding medium. The past five decades have significantly advanced our understanding these objects, showed that most relevant some mysterious energetic events in distant Universe, including Fast Radio Bursts Gravitational Wave sources. However, many questions remain be answered. These include: What powers diversity explosive phenomena across...
We present a phase-dependent analysis of the polarized emission from Crab pulsar based on three sets observations by Imaging X-ray Polarimetry Explorer (IXPE). found that phenomenological model involving simple linear transformation Stokes parameters adequately describes IXPE data. This enabled us to establish connection between polarization properties in optical and soft bands for first time, which suggests common underlying mechanism these likely is synchrotron radiation. In particular,...
Abstract We present our findings on magnetar spectral line analysis in the context of upcoming high resolution, effective area, throughput X-ray telescopes for two cases: persistent emission and bursts. For magnetars quiescence, we preliminary work modelling phase-resolved emission. Our results reveal necessity constraining depth width concurrently with energy to conclusively determine hotspot corresponding magnetic field geometry. then simulations using area response various current...
The X-ray emission of neutron stars and black holes presents a rich phenomenology that can lead us to better understanding their nature address more general physics questions: Does relativity apply in the strong gravity regime? Is spacetime around described by Kerr metric? This white paper considers how we investigate these questions studying reverberation mapping quasi-periodic oscillations accreting systems with combination high-spectral high-timing resolution. In near future, will be able...
The advent of moderately high-resolution X-ray spectroscopy with Chandra and XMM promised to usher in a new age the study neutron stars: we thought would stars like stars, resolved absorption spectra revealing their surface chemical composition physical conditions (e.g. gravity, pressure, temperature). Nature, however, did not cooperate this endeavor, as observations have revealed verified atomic lines yet. In near future, advancements transition-edge sensors (TES) technology will allow for...
We present our findings on magnetar spectral line analysis in the context of upcoming high resolution, effective area, throughput X-ray telescopes for two cases: persistent emission and bursts. For magnetars quiescence, we preliminary work modelling phase-resolved emission. Our results reveal necessity constraining depth width concurrently with energy to conclusively determine hotspot corresponding magnetic field geometry. then simulations using area response various current detection expand...
We report on the first detection of linearly polarized x-ray emission from an ultra-magnetized neutron star with Imaging X-ray Polarimetry Explorer (IXPE). The IXPE 35 observations anomalous pulsar 4U 0142+61 reveal a linear polarization degree $(12\pm 1)\%$ throughout 2--8 keV band. detect substantial variation energy: is $(14\pm at 2--4 and $(41\pm 7)\%$ 5.5--8 keV, while it drops below instrumental sensitivity around 4--5 where angle swings by $\sim 90^\circ$. give us completely new...