Martin C. Weisskopf
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View article: In-flight Performance of the IXPE Telescopes
In-flight Performance of the IXPE Telescopes Open
We present a comprehensive characterization of the on-orbit imaging performance of the three telescopes on board the Imaging X-ray Polarimetry Explorer (IXPE). Each telescope comprises a Wolter-I mirror module assembly and a Gas Pixel Dete…
View article: Detection of Compton Scattering in the Jet of 3C 84
Detection of Compton Scattering in the Jet of 3C 84 Open
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View article: Detection of Compton Scattering in the Jet of 3C 84
Detection of Compton Scattering in the Jet of 3C 84 Open
3C 84 is the brightest cluster galaxy in the Perseus Cluster. It is among the closest radio-loud active galaxies and among the very few that can be detected from low-frequency radio up to TeV γ -rays. Here we report on the first X-ray pola…
View article: In-flight performance of the IXPE telescopes
In-flight performance of the IXPE telescopes Open
We present a comprehensive characterization of the on-orbit imaging performance of the three telescopes on board the Imaging X-ray Polarimetry Explorer (IXPE). Each telescope comprises a Wolter-I mirror module assembly and a Gas Pixel Dete…
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: Unveiling blazar synchrotron emission: a multiwavelength polarimetric study of HSP and LSP populations
Unveiling blazar synchrotron emission: a multiwavelength polarimetric study of HSP and LSP populations Open
Polarimetric properties of blazars allow us to put constraints on the acceleration mechanisms that fuel their powerful jets. By studying the multiwavelength polarimetric behaviour of high synchrotron peaked (HSP) and low synchrotron peaked…
View article: NuSTAR Analysis of the 2024 Periastron Passage of TeV Binary PSR B1259-63
NuSTAR Analysis of the 2024 Periastron Passage of TeV Binary PSR B1259-63 Open
PSR B1259-63 is a well-studied TeV binary, with an energetic pulsar in orbit around a Be star. Using Nuclear Spectroscopic Telescope Array observations during the 2024 passage of the pulsar through the circumstellar disk, we find the spect…
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: Determining the origin of the X-ray emission in blazars through multiwavelength polarization
Determining the origin of the X-ray emission in blazars through multiwavelength polarization Open
The origin of the high-energy emission in astrophysical jets from black holes is a highly debated issue. This is particularly true for jets from supermassive black holes, which are among the most powerful particle accelerators in the Unive…
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: 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: Magnetic Field Geometry of the Gamma-Ray Binary PSR B1259–63 Revealed via X-Ray Polarization
Magnetic Field Geometry of the Gamma-Ray Binary PSR B1259–63 Revealed via X-Ray Polarization Open
Some X-ray binaries containing an energetic pulsar in orbit around a normal star accelerate particles to high energies in the shock cone formed where the pulsar and stellar winds collide. The magnetic field geometry in the acceleration reg…
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: Magnetic field geometry of the gamma-ray binary PSR B1259-63 revealed via X-ray polarization
Magnetic field geometry of the gamma-ray binary PSR B1259-63 revealed via X-ray polarization Open
Some X-ray binaries containing an energetic pulsar in orbit around a normal star accelerate particles to high energies in the shock cone formed where the pulsar and stellar winds collide. The magnetic field geometry in the acceleration reg…
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: Considerations on Possible Directions for a Wide Band Polarimetry X-ray Mission
Considerations on Possible Directions for a Wide Band Polarimetry X-ray Mission Open
The Imaging X-ray Polarimetry Explorer (IXPE) has confirmed that X-ray polarimetry is a valuable tool in astronomy, providing critical insights into the emission processes and the geometry of compact objects. IXPE was designed to be sensit…
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: On the Making of IXPE
On the Making of IXPE Open
Drs. Weisskopf and Ramsey were the original Principal and Deputy Principal Investigators of the Imaging X-ray Polarimetry Explorer (IXPE). They outline the path to the development of IXPE and discuss the technical and programmatic history …
View article: Testing particle acceleration in blazar jets with continuous high-cadence optical polarization observations
Testing particle acceleration in blazar jets with continuous high-cadence optical polarization observations Open
Variability can be the pathway to understanding the physical processes in astrophysical jets. However, the high-cadence observations required to test particle acceleration models are still missing. Here we report on the first attempt to pr…
View article: An IXPE-led X-Ray Spectropolarimetric Campaign on the Soft State of Cygnus X-1: X-Ray Polarimetric Evidence for Strong Gravitational Lensing
An IXPE-led X-Ray Spectropolarimetric Campaign on the Soft State of Cygnus X-1: X-Ray Polarimetric Evidence for Strong Gravitational Lensing Open
We present the first X-ray spectropolarimetric results for Cygnus X-1 in its soft state from a campaign of five IXPE observations conducted during 2023 May–June. Companion multiwavelength data during the campaign are likewise shown. The 2–…
View article: Cygnus X-3 revealed as a Galactic ultraluminous X-ray source by IXPE
Cygnus X-3 revealed as a Galactic ultraluminous X-ray source by IXPE Open
View article: Testing particle acceleration in blazar jets with continuous high-cadence optical polarization observations
Testing particle acceleration in blazar jets with continuous high-cadence optical polarization observations Open
Appendix A "Comparison to simulations" of the paper titled "Testing particle acceleration in blazar jets with continuous high-cadence optical polarization observations" accepted for publication in A&A.
View article: Complex rotational dynamics of the neutron star in Hercules X-1 revealed by X-ray polarization
Complex rotational dynamics of the neutron star in Hercules X-1 revealed by X-ray polarization Open
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: 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: Dramatic Drop in the X-Ray Polarization of Swift J1727.8–1613 in the Soft Spectral State
Dramatic Drop in the X-Ray Polarization of Swift J1727.8–1613 in the Soft Spectral State Open
Black hole X-ray binaries exhibit different spectral and timing properties in different accretion states. The X-ray outburst of a recently discovered and extraordinarily bright source, Swift J1727.8–1613, has enabled the first investigatio…