Banafsheh Beheshtipour

Deep Einstein@Home Search for Continuous Gravitational Waves from the Central Compact Objects in the Supernova Remnants Vela Jr. and G347.3-0.5 Using LIGO Public Data

Jing Ming, Maria Alessandra Papa, H.-B. Eggenstein, Banafsheh Beheshtipour et autres

Abstract We perform a search for continuous nearly monochromatic gravitational waves from the central compact objects associated with the supernova remnants Vela Jr. and G347.3. Over 1018 different waveforms are considered, covering signal frequencies between 20 and 1300 Hz (20 and 400 …

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X-Ray Polarization of the Black Hole X-Ray Binary 4U 1630–47 Challenges the Standard Thin Accretion Disk Scenario

Ajay Ratheesh, Michal Dovčiak, Henric S. Krawczynski, Jakub Podgorný et autres

Abstract A large energy-dependent X-ray polarization degree is detected by the Imaging X-ray Polarimetry Explorer (IXPE) in the high-soft emission state of the black hole X-ray binary 4U 1630–47. The highly significant detection (at ≈50σ confidence level) of an unexpectedly high polarization, …

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Deep Einstein@Home Search for Continuous Gravitational Waves from the Central Compact Objects in the Supernova Remnants Vela Jr. and G347.3-0.5 Using LIGO Public Data

Jing Ming, Maria Alessandra Papa, H.-B. Eggenstein, Banafsheh Beheshtipour et autres

We perform a search for continuous nearly monochromatic gravitational waves from the central compact objects associated with the supernova remnants Vela Jr. and G347.3 using LIGO O2 and O3 public data. Over $10^{18}$ different waveforms are considered, covering signal frequencies between 20-1300 …

The first X-ray polarimetric observation of the black hole binary LMC X-1

Jakub Podgorný, Lorenzo Marra, Fabio Muleri, Nicole Rodriguez Cavero et autres

ABSTRACT We report on an X-ray polarimetric observation of the high-mass X-ray binary LMC X-1 in the high/soft state, obtained by the Imaging X-ray Polarimetry Explorer (IXPE) in 2022 October. The measured polarization is below the minimum detectable polarization of 1.1 per …

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Fabrication and characterization of electroactive polymer actuators for high-resolution adjustable x-ray optics

Banafsheh Beheshtipour, M. Errando, Casey T. DeRoo, Kenneth Buffo

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X-ray Polarization of the Black Hole X-ray Binary 4U 1630-47 Challenges Standard Thin Accretion Disk Scenario

Ajay Ratheesh, Michal Dovčiak, Henric S. Krawczynski, Jakub Podgorný et autres

Large energy-dependent X-ray polarization degree is detected by the Imaging X-ray Polarimetry Explorer ({IXPE}) in the high-soft emission state of the black hole X-ray binary 4U 1630--47. The highly significant detection (at $\approx50σ$ confidence level) of an unexpectedly high polarization, rising from …

New Constraints on the Spin of the Black Hole Cygnus X-1 and the Physical Properties of its Accretion Disk Corona

Henric S. Krawczynski, Banafsheh Beheshtipour

Abstract We present a new analysis of NuSTAR and Suzaku observations of the black hole Cygnus X-1 in the intermediate state. The analysis is performed using kerrC, a new model for analyzing spectral and spectropolarimetric X-ray observations of black holes. kerrC builds …

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Performance of the X-Calibur hard X-ray polarimetry mission during its 2018/19 long-duration balloon flight

Q. Abarr, Banafsheh Beheshtipour, Richard G. Bose, D. Braun et autres

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Performance of the X-Calibur Hard X-Ray Polarimetry Mission during its 2018/19 Long-Duration Balloon Flight

Q. Abarr, Banafsheh Beheshtipour, M. Beilicke, Richard G. Bose et autres

X-Calibur is a balloon-borne telescope that measures the polarization of high-energy X-rays in the 15--50keV energy range. The instrument makes use of the fact that X-rays scatter preferentially perpendicular to the polarization direction. A beryllium scattering element surrounded by pixellated CZT detectors …

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New Searches for Continuous Gravitational Waves from Seven Fast Pulsars

Abbarapu Ashok, Banafsheh Beheshtipour, Maria Alessandra Papa, Paulo C. C. Freire et autres

Abstract We conduct searches for continuous gravitational waves from seven pulsars that have not been targeted in continuous wave searches of Advanced LIGO data before. We target emission at exactly twice the rotation frequency of the pulsars and in a small band …

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Deep learning for clustering of continuous gravitational wave candidates. II. Identification of low-SNR candidates

Banafsheh Beheshtipour, Maria Alessandra Papa

Broad searches for continuous gravitational wave signals rely on hierarchies of follow-up stages for candidates above a given significance threshold. An important step to simplify these follow-ups and reduce the computational cost is to bundle together in a single follow-up nearby candidates. …

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Discovery of a Gamma-Ray Black Widow Pulsar by GPU-accelerated Einstein@Home

L. Nieder, C. J. Clark, D. Kandel, Roger W. Romani et autres

Abstract We report the discovery of 1.97 ms period gamma-ray pulsations from the 75 minute orbital-period binary pulsar now named PSR J1653−0158. The associated Fermi Large Area Telescope gamma-ray source 4FGL J1653.6−0158 has long been expected to harbor a binary millisecond pulsar. …

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