G. Spandre
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View article: ASIX: Single-photon, energy resolved X-ray imaging with 50 μm hexagonal hybrid pixel
ASIX: Single-photon, energy resolved X-ray imaging with 50 μm hexagonal hybrid pixel Open
The Analog Spectral Imager for X-rays is a technology demonstrator of a small-pixel Hybrid Pixel Detector (HPD) designed for applications such as X-ray diffraction, synchrotron-based material science, and soft X-ray astrophysics requiring …
View article: X-Ray Polarization Detection of the Pulsar Wind Nebula in G21.5–0.9 with IXPE
X-Ray Polarization Detection of the Pulsar Wind Nebula in G21.5–0.9 with IXPE Open
We present the X-ray polarization observation of G21.5−0.9, a young Galactic supernova remnant (SNR), conducted with the Imaging X-ray Polarimetry Explorer (IXPE) in 2023 October, with a total livetime of approximately 837 ks. Using differ…
View article: A Systematic Search for MeV–GeV Pulsar Wind Nebulae without Gamma-Ray Detected Pulsars
A Systematic Search for MeV–GeV Pulsar Wind Nebulae without Gamma-Ray Detected Pulsars Open
An increasing number of pulsar wind nebulae (PWNe) are being identified in the TeV band by ground-based Imaging Air Cherenkov Telescopes such that they constitute the dominant source class of Galactic TeV emitters. However, MeV–GeV PWN cou…
View article: X-ray Polarization Detection of the Pulsar Wind Nebula in G21.5-0.9 with IXPE
X-ray Polarization Detection of the Pulsar Wind Nebula in G21.5-0.9 with IXPE Open
We present the X-ray polarization observation of G21.5-0.9, a young Galactic supernova remnant (SNR), conducted with the Imaging X-ray Polarimetry Explorer (IXPE) in October 2023, with a total livetime of approximately 837 ks. Using differ…
View article: The Telescope Calibration of the Imaging X-Ray Polarimetry Explorer
The Telescope Calibration of the Imaging X-Ray Polarimetry Explorer Open
Fifty years after the very first sounding rocket measurement of cosmic X-ray polarization, the Imaging X-ray Polarimetry Explorer (IXPE) mission has effectively opened a new window into the X-ray sky. Prior to launch of IXPE, an extensive …
View article: The Telescope Calibration of the Imaging X-ray Polarimetry Explorer
The Telescope Calibration of the Imaging X-ray Polarimetry Explorer Open
Fifty years after the very first sounding rocket measurement of cosmic X-ray polarization, the Imaging X-ray Polarimetry Explorer (IXPE) mission has effectively opened a new window into the X-ray sky. Prior to launch of IXPE, an extensive …
View article: Fermi detection of gamma-ray Emission from the Hot Coronae of Radio-quiet Active Galactic Nuclei
Fermi detection of gamma-ray Emission from the Hot Coronae of Radio-quiet Active Galactic Nuclei Open
Relativistic jets around supermassive black holes (SMBHs) are well-known powerful $γ$-ray emitters. In absence of the jets in radio-quiet active galactic nuclei (AGNs), how the SMBHs work in $γ$-ray bands is still unknown despite of great …
View article: Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations
Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations Open
A 2.1 yr periodic oscillation of the gamma-ray flux from the blazar PG 1553+113 has previously been tentatively identified in ∼7 yr of data from the Fermi Large Area Telescope. After 15 yr of Fermi sky-survey observations, doubling the tot…
View article: Evidence for a shock-compressed magnetic field in the northwestern rim of Vela Jr. from X-ray polarimetry
Evidence for a shock-compressed magnetic field in the northwestern rim of Vela Jr. from X-ray polarimetry Open
Synchrotron X-ray emission has been detected from nearly a dozen young supernova remnants (SNRs). X-rays of synchrotron origin exhibit linear polarization in a regular, non-randomly oriented magnetic field. The significant polarized X-ray …
View article: Evidence for a shock-compressed magnetic field in the northwestern rim of Vela Jr. from X-ray polarimetry
Evidence for a shock-compressed magnetic field in the northwestern rim of Vela Jr. from X-ray polarimetry Open
Synchrotron X-ray emission has been detected from nearly a dozen young supernova remnants (SNRs). X-rays of synchrotron origin exhibit linear polarization in a regular, non-randomly oriented magnetic field. The significant polarized X-ray …
View article: Analysis of Crab X-Ray Polarization Using Deeper Imaging X-Ray Polarimetry Explorer Observations
Analysis of Crab X-Ray Polarization Using Deeper Imaging X-Ray Polarimetry Explorer Observations Open
We present Crab X-ray polarization measurements using Imaging X-Ray Polarimetry Explorer (IXPE) data with a total exposure of 300 ks, three times more than the initial 2022 discovery paper. Polarization is detected in three times more puls…
View article: Probing the polarized emission from SMC X-1: The brightest X-ray pulsar observed by IXPE
Probing the polarized emission from SMC X-1: The brightest X-ray pulsar observed by IXPE Open
Recent observations of X-ray pulsars (XRPs) performed by the Imaging X-ray Polarimetry Explorer (IXPE) have made it possible to investigate the intricate details of these objects in a new way, thanks to the added value of X-ray polarimetry…
View article: Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry
Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry Open
Discovery of pulsations from a number of ultra-luminous X-ray (ULX) sources proved that accretion onto neutron stars can produce luminosities exceeding the Eddington limit by several orders of magnitude. The conditions necessary to achieve…
View article: The imaging x-ray polarimetry explorer 2.5 years later
The imaging x-ray polarimetry explorer 2.5 years later Open
Soffitta, Paolo et al.-- Full list of the authors: Soffitta, Paolo; Baldini, Luca; Baumgartner, Wayne; Bellazzini, Ronaldo; Bongiorno, Stephen D.; Bucciantini, Niccolò; Costa, Enrico; Dovčiak, Michal; Ehlert, Steven; Kaaret, Philip E.; Kol…
View article: Discovery of a strong rotation of the X-ray polarization angle in the galactic burster GX 13+1
Discovery of a strong rotation of the X-ray polarization angle in the galactic burster GX 13+1 Open
Weakly magnetized neutron stars in X-ray binaries show a complex phenomenology with several spectral components that can be associated with the accretion disk, the boundary, and/or a spreading layer, a corona, and a wind. Spectroscopic inf…
View article: Analysis of Crab X-ray Polarization using Deeper IXPE Observations
Analysis of Crab X-ray Polarization using Deeper IXPE Observations Open
We present Crab X-ray polarization measurements using IXPE data with a total exposure of 300ks, three times more than the initial 2022 discovery paper. Polarization is detected in three times more pulsar phase bins, revealing an S-shaped $…
View article: Probing the polarized emission from SMC X-1: the brightest X-ray pulsar observed by IXPE
Probing the polarized emission from SMC X-1: the brightest X-ray pulsar observed by IXPE Open
Recent observations of X-ray pulsars (XRPs) performed by the Imaging X-ray Polarimetry Explorer (IXPE) have made it possible to investigate the intricate details of these objects in a new way, thanks to the added value of X-ray polarimetry…
View article: Discovery of a Shock-compressed Magnetic Field in the Northwestern Rim of the Young Supernova Remnant RX J1713.7–3946 with X-Ray Polarimetry
Discovery of a Shock-compressed Magnetic Field in the Northwestern Rim of the Young Supernova Remnant RX J1713.7–3946 with X-Ray Polarimetry Open
Supernova remnants (SNRs) provide insights into cosmic-ray acceleration and magnetic field dynamics at shock fronts. Recent X-ray polarimetric measurements by the Imaging X-ray Polarimetry Explorer (IXPE) have revealed radial magnetic fiel…
View article: X-ray polarization measurement of the gold standard of radio-quiet active galactic nuclei: NGC 1068
X-ray polarization measurement of the gold standard of radio-quiet active galactic nuclei: NGC 1068 Open
Context. NGC 1068 is the most observed radio-quiet active galactic nucleus (AGN) in polarimetry, yet its high-energy polarization has never been probed before due to a lack of dedicated polarimeters. Aims. Using the first X-ray polarimeter…
View article: Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry
Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry Open
Discovery of pulsations from a number of ULXs proved that accretion onto neutron stars can produce luminosities exceeding the Eddington limit by several orders of magnitude. The conditions necessary to achieve such high luminosities as wel…
View article: Pulsar-wind-nebula-powered Galactic center X-ray filament G0.13–0.11
Pulsar-wind-nebula-powered Galactic center X-ray filament G0.13–0.11 Open
We report the discovery of X-ray polarization from the X-ray-bright filament G0.13−0.11 in the Galactic center (GC) region. This filament features a bright, hard X-ray source that is most plausibly a pulsar wind nebula (PWN) and an extende…
View article: X-ray polarization measurement of the gold standard of radio-quiet active galactic nuclei : NGC 1068
X-ray polarization measurement of the gold standard of radio-quiet active galactic nuclei : NGC 1068 Open
We used the Imaging X-ray Polarimetry Explorer (IXPE) satellite to measure, for the first time, the 2-8 keV polarization of NGC 1068. We pointed IXPE for a net exposure time of 1.15 Ms on the target, in addition to two ~ 10 ks each Chandra…
View article: X-Ray Polarimetry of the Dipping Accreting Neutron Star 4U 1624–49
X-Ray Polarimetry of the Dipping Accreting Neutron Star 4U 1624–49 Open
We present the first X-ray polarimetric study of the dipping accreting neutron star 4U 1624−49 with the Imaging X-ray Polarimetry Explorer. We report a detection of polarization in the nondip time intervals with a confidence level of 99.99…
View article: First detection of polarization in X-rays for PSR B0540-69 and its nebula
First detection of polarization in X-rays for PSR B0540-69 and its nebula Open
We report on X-ray polarization measurements of the extra-galactic Crab-like PSR B0540-69 and its Pulsar Wind Nebula (PWN) in the Large Magellanic Cloud (LMC), using a ~850 ks Imaging X-ray Polarimetry Explorer (IXPE) exposure. The PWN is …
View article: First Detection of Polarization in X-Rays for PSR B0540-69 and Its Nebula
First Detection of Polarization in X-Rays for PSR B0540-69 and Its Nebula Open
We report on X-ray polarization measurements of the extragalactic Crab-like PSR B0540-69 and its Pulsar Wind Nebula (PWN) in the Large Magellanic Cloud, using a ∼850 ks Imaging X-ray Polarimetry Explorer (IXPE) exposure. The PWN is unresol…
View article: Discovery of a strong rotation of the X-ray polarization angle in the galactic burster GX 13+1
Discovery of a strong rotation of the X-ray polarization angle in the galactic burster GX 13+1 Open
Weakly magnetized neutron stars in X-ray binaries show complex phenomenology with several spectral components that can be associated with the accretion disk, boundary and/or spreading layer, a corona, and a wind. Spectroscopic information …
View article: X-Ray Polarized View of the Accretion Geometry in the X-Ray Binary Circinus X-1
X-Ray Polarized View of the Accretion Geometry in the X-Ray Binary Circinus X-1 Open
Cir X-1 is a neutron star X-ray binary characterized by strong variations in flux during its eccentric ∼16.6 day orbit. There are also strong variations in the spectral state, and it has historically shown both atoll and Z state properties…
View article: X-Ray Polarization of the Eastern Lobe of SS 433
X-Ray Polarization of the Eastern Lobe of SS 433 Open
How astrophysical systems translate the kinetic energy of bulk motion into the acceleration of particles to very high energies is a pressing question. SS 433 is a microquasar that emits TeV γ -rays indicating the presence of high-energy pa…