Results 91 to 100 of about 13,324 (197)

In-flight Performance of the IXPE Telescopes

The Astronomical Journal
We present a comprehensive characterization of the on-orbit imaging performance of the three telescopes on board the Imaging X-ray Polarimetry Explorer (IXPE).
Riccardo Ferrazzoli, Enrico Costa, Sergio Fabiani, Philip Kaaret, Stephen L. O’Dell, Brian D. Ramsey, Paolo Soffitta, Luca Baldini, Ronaldo Bellazzini, Alessandro Di Marco, Fabio La Monaca, Luca Latronico, Alberto Manfreda, Fabio Muleri, John Rankin, Carmelo Sgró, Stefano Silvestri, Martin C. Weisskopf   +17 more
doaj   +1 more source

Modelling the X-ray polarimetric signatures of complex geometry: the case study of the "changing look" AGN NGC 1365

, 2013
"Changing look" Active Galactic Nuclei (AGN) are a subset of Seyfert galaxies characterized by rapid transitions between Compton-thin and Compton-thick regimes.
Dovciak, Michal, Goosmann, Rene W., Grosso, Nicolas, Karas, Vladimir, Marin, Frederic, Muleri, Fabio, Porquet, Delphine   +6 more
core   +2 more sources

The IXPE View of Neutron Star Low-Mass X-ray Binaries

Galaxies
Low-mass X-ray binaries hosting weakly magnetized neutron stars (NS-LMXBs) are among the brightest sources in the X-ray sky. Since 2021, the Imaging X-ray Polarimetry Explorer (IXPE) has provided new measurements of the X-ray polarization of these ...
Francesco Ursini, Andrea Gnarini, Fiamma Capitanio, Anna Bobrikova, Massimo Cocchi, Alessandro Di Marco, Sergio Fabiani, Ruben Farinelli, Fabio La Monaca, John Rankin, Mary Lynne Saade, Juri Poutanen   +11 more
doaj   +1 more source

Gas pixel detectors for X-ray polarimetry applications

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2006
16 pages, 20 figures, accepted for publication in Nuclear Instruments and Methods in Physics Research Section ...
Bellazzini R, ANGELINI, FRANCO, BALDINI, LUCA, Bitti F, Brez A, Cavalca F, Del Prete M, Kuss M, Latronico L, Omodei N, Pinchera M, MASSAI, MARCO MARIA, Minuti M, RAZZANO, MASSIMILIANO, Sgro C, Spandre G, Tenze A, Costa E, Soffitta P.   +18 more
openaire   +4 more sources

The optical/UV excess of X-ray dim isolated neutron star: I. bremsstrahlung emission from a strangeon star plasma atmosphere

, 2017
X-ray dim isolated neutron stars (XDINSs) are characterized by Planckian spectra in X-ray bands, but show optical/ultraviolet(UV) excesses which are the measured photometry exceeding that is extrapolated from X-ray spectra.
Ge, Mingyu, Li, Zhaosheng, Lu, Jiguang, Men, Yunpeng, Tong, Hao, Wang, Weiyang, Xu, Renxin   +6 more
core   +2 more sources

Characterization of x-ray detectors in the MIT x-ray polarimetry beamline

X-Ray, Optical, and Infrared Detectors for Astronomy XI
The MIT X-ray Polarimetry Beamline is a facility that we developed for testing components for possible use in X-ray polarimetry. Over the past few years, we have demonstrated that the X-ray source can generate nearly 100% polarized X-rays at various energies from 183 eV (Boron K$α$) to 705 eV (Fe L$α$) using a laterally graded multilayer coated mirror (
Heine, Sarah N. T., Marshall, Herman L., Schneider, Benjamin, Lamar, Beverly, Kothnur, Nithya, Garner, Alan   +5 more
openaire   +2 more sources

X-Ray Polarization from the Atoll 4U 1735−44 Suggests a Low Inclination

The Astrophysical Journal
X-ray polarimetry is a new tool capable of probing the geometry of accretion onto weakly magnetized neutron stars. Here we present the first X-ray spectropolarimetric results from coordinated observations of the atoll source 4U 1735−44, conducted with ...
María Alejandra Díaz Teodori, Anna Bobrikova, Andrea Gnarini, Francesco Ursini, Sofia V. Forsblom, Juri Poutanen, Alexander Salganik, Stefano Bianchi, Fiamma Capitanio, Massimo Cocchi, Sergio Fabiani, Ruben Farinelli, Philip Kaaret, Jari J. E. Kajava, Giorgio Matt, Mason Ng, Swati Ravi, Paolo Soffitta, Antonella Tarana, Silvia Zane   +19 more
doaj   +1 more source

Polarization Reconstruction Based on Monte Carlo Simulations for a Compton Polarimeter

Atoms
State-of-the-art 2D sensitive semiconductor detectors developed within the SPARC collaboration can be utilized as dedicated Compton polarimeters in the hard X-ray regime.
Tobias Over-Winter, Wilko Middents, Günter Weber, Thomas Stöhlker   +3 more
doaj   +1 more source

Hot Coronae in Local AGN: Present Status and Future Perspectives

Galaxies, 2018
The nuclear X-ray emission in radio-quiet Active Galactic Nuclei (AGN) is commonly believed to be due to inverse Compton scattering of soft UV photons in a hot corona. The radiation is expected to be polarized, the polarization degree depending mainly on
Andrea Marinucci, Francesco Tamborra, Stefano Bianchi, Michal Dovčiak, Giorgio Matt, Riccardo Middei, Alessia Tortosa   +6 more
doaj   +1 more source

Development of a Thomson X-ray Polarimeter

, 2010
We describe the current status of the design and development of a Thomson X-ray polarimeter suitable for a small satellite mission. Currently we are considering two detector geometries, one using rectangular detectors placed on four sides of a scattering
Cowsik, Ramanath, Devasia, Jincy, James, Marykutty, Paul, Biswajit, R., Duraichelvan, V., Rishin P.   +5 more
core