Results 91 to 100 of about 13,399 (197)

The magnetic field and geometry of the oblique shock in the jet of 3C 346

, 2009
We investigate the brightest regions of the kpc-scale jet in the powerful radio galaxy 3C 346, using new optical HST ACS/F606W polarimetry together with Chandra X-ray data and 14.9 GHz and 22.5 GHz VLA radio polarimetry.
Akujor, Anderson, Bahcall, Bridle, C. A. Padgett, Cawthorne, Cawthorne, Cotton, D. M. Worrall, de Koff, de Vries, Dey, Dulwich, E. S. Perlman, F. Dulwich, Fedorenko, Giovannini, Hardcastle, Hook, Keel, Kirk, Koekemoer, Laing, Lind, Lyutikov, M. Birkinshaw, Pavlovsky, Perlman, Perlman, Serkowski, Spencer, Wardle, Worrall, Worrall, Worrall   +34 more
core   +1 more source

IXPE Mission System Concept and Development Status [PDF]

The Goal of the Imaging X-Ray Polarimetry Explorer (IXPE) Mi SMEX), is to expand understanding of high-energy astrophysical processes and sources, in support of NASAs first science objective in Astrophysics: Discover how the universe works.
Baldini, Lucca, Bladt, Jeff, Deininger, William D., Del Monte, Ettore, Foster, Michele, Gray, Stu, Hibbard, Grant, Kalinowski, William, Latronico, Lucca, Masciarelli, James, Mize, Rondald, Muleri, Fabio, O'Dell, Stephen L., Osborne, Darren, Peterson, Colin, Pinchera, Michele, Ramsey, Brian D., Santoli, Francesco, Soffitta, Paolo, Tennant, Allyn, Trois, Alessio, Wedmore, Jeff, Weisskopf, Martin C.   +22 more
core   +1 more source

X-ray polarimetric signatures induced by spectral variability in the framework of the receding torus model

, 2016
Obscuring circumnuclear dust is a well-established constituent of active galactic nuclei (AGN). Traditionally referred to as the receding dusty torus, its inner radius and angular extension should depend on the photo-ionizing luminosity of the central ...
Goosmann, R. W., Marin, F., Petrucci, P. -O.   +2 more
core   +3 more sources

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

Polarized X-rays from Magnetized Neutron Stars

, 2009
We review the polarization properties of X-ray emission from highly magnetized neutron stars, focusing on emission from the stellar surfaces. We discuss how x-ray polarization can be used to constrain neutron star magnetic field and emission geometry ...
Heyl, Jeremy S., Ho, Wynn C. G., Lai, Dong, van Adelsberg, Matthew, Wang, Chen   +4 more
core   +1 more source

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

Polarization properties of X-ray millisecond pulsars

, 2009
Radiation of X-ray bursts and of accretion shocks in weakly magnetized neutron stars in low-mass X-ray binaries is produced in plane-parallel atmospheres dominated by electron scattering.
Poutanen, Juri
core   +1 more source

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