Abstracts

Rene Hudec: AXRO Welcome and Historical Background

AXRO Welcome and Historical Background will be given.

John Nousek: Speeding up Swift

NASA\'s Neil Gehrels Swift Observatory has functioned for a decade and a half as the world\'s premier observatory for rapid time-domain astrophysics. The pace of extraordinary speed of discovery through programs such as the LIGO gravitational wave, IceCube neutrino sources and the LSST transient discovery program demands that Swift becomes even faster, and able to handle multiple simultaneous Target of Opportunity requests. I will outline our plans for new software development and operational management that both shorten Swift\'s response times, more...

Gabriel Torok: On the mass and quasi-periodic modulation of X-ray flux of active galactic nuclei

TBI

Tanmoy Chattopadhyay: Characterization of an X-ray Lobster Optic with a Hybrid CMOS detector

X-ray lobster optics provide a unique way to focus X-rays onto a small focal plane imager with wide field of view imaging. With angular resolution of a few arcminutes, such an instrument can be used to study GRB afterglows, transients, and the variability and spectroscopic characteristics of myriad other astrophysical objects. At Penn State University, we are characterizing a lobster optic with an H1RG X-Ray hybrid CMOS detector (100 μm thick Silicon with 18 μm pixel size). The light-weight compact more...

Vojtech Simon: Long-term activity of binary X-ray sources in various energy bands

Monitors of X-ray emission are important instruments for observing the activity of X-ray sources on the long timescales (e.g., years). Simultaneous monitoring of the same object with several monitors (e.g., with ISS/MAXI and Swift/BAT) and smoothing of the data by the one-day means enables us to investigate the activity in various energy bands (even spanning over several tens of kiloelectronvolts). It also enables to determine the hardness ratio of X-ray emission. This approach is useful also for the future satellites. more...

Maria D. Caballero-Garcia: Results from the use of the X-ray reverberation model KYNREFREV: exploring new coronal geometries

X-ray reverberation in Active Galactic Nuclei, believed to be the result of the reprocessing of corona photons by the underlying accretion disc, has allowed us to probe the properties of the inner-most regions of the accretion flow and the central black hole. Our current model (KYNREFREV) computes the time-dependent reflection spectra of the disc as a response to a flash of primary power-law radiation from a point source corona located on the axis of the black hole accretion disc (lamp-post more...

Rene Hudec: ESA SMILE and Czech participation

The Solar wind Magnetosphere Ionosphere Link Explorer, or SMILE, is a joint mission between the European Space Agency (ESA) and the Chinese Academy of Sciences (CAS). SMILE aims to build a more complete understanding of the Sun-Earth connection by measuring the solar wind and its dynamic interaction with the magnetosphere. The scientific payload includes the soft X-ray telescope SXI based on Lobster Eye optis for providing X ray images of X ray emitting regios in Earths magnetospehere. The Czech participation more...

Vladimír Dániel: REX LE X-ray Telescope experiment overview

The presentation will summarize the Rocket EXperiment (REX) LE X-ray Telescope payload results. The experiment was performed by the PennState University with X-ray spectroscope on board a Water Recovery X-Ray Rocket (WRXR) launched on 4th April, 2018. The secondary payload was the REX LE X-ray Telescope. The REX LE X-ray telescope consists of two X-ray telescopes with 1D and 2D optics, a single visible-light camera and an IR grid-eye. The primary structure consists of a metal housing for the optics and more...

Thorsten Döhring: Methods of coating stress compensation for iridium based X-ray mirrors

Iridium-based coatings for mirrors of spaceborn X-ray telescopes were studied in a cooperation between Aschaffenburg University (Germany) and the Institut Fresnel in Marseille (France). In particular, the stress induced deformation of thin glass substrates by magnetron sputtered iridium layers has been characterized and shown to be compressive and equal to about -1786 MPa. Two methods for stress compensation are then studied. One relies on the deposition of silica on the back surface of the substrate and a second one relies more...

Richard Willingale: An X-ray Test Station for Micro Channel Optics

Micro Channel Optics with square pores are used to produce lobster eye X-ray mirrors. We will describe a dedicated facility designed and built to characterise the full performance of MCOs in X-rays. A single simple test using the facility gives information on the radius of curvature, efficiency and angular resolution of the MCO. It is intended that such a test station is used during the manufacture of MCOs to improve the quality of the final optics and as part of more...

Marta Civitani: Full shells for Lynx Mirror Assembly

Vladimir Tichy: Analytic calculation of performance of lobster eye

Herman Marshall: Methods for Soft X-ray Polarimetry

I will describe development and testing of components to be used to measure the polarization of soft X-rays for astronomical applications. We have acquired and tested multilayer coated mirrors with a lateral grading in order to match them to the dispersion of a grating-based spectrometer. We have demonstrated methods for the 0.15-0.40 keV band. We are also working on new components to expand the bandpass to 1-2 keV.

Herman Marshall: Optics for the Imaging X-ray Polarimetry Explorer (IXPE)

On behalf of the collaboration, I will describe the instrumentation of a NASA mission, the Imaging X-ray Polarimetry Explorer. The instrument, expected to launch in early 2021, would be the first in over 40 years to measure X-ray polarization of astronomical sources in the 2-8 keV band. IXPE will have full-shell optics with half-power diameter of less than 30 arc seconds from the Marshall Space Flight Center and photoelectron tracking detectors from Italy funded by ASi. I more...

Tomáš Báča: VZLUSAT-1: A Year of Space Radiation Monitoring on the First Czech CubeSat

The VZLUSAT-1 satellite, the first Czech CubeSat, was successfully launched on June 23, 2017, to a 510 km Sun-synchronous low-Earth orbit. It carries several scientific payloads including a Timepix detector as focal plane imager for the X-Ray telescope on board. The Timepix detector contributes significantly to the satellite data collection, with more than 25 000 sampling acquisitions in the first year of deployment. Despite limitations of the satellite attitude control system, necessary for capturing X-Ray images of the Sun, the more...

Wenda Zhang: Probing Bardeen-Petterson effect in tidal disruption events with spectral line reverberation mapping

For inclined accretion flow around rotating black hole, the combined effect of Lense-Thirring precession and viscous torque tend to align the inner part of the flow with the black hole spin, leading to the formation of a warped disc, known as Bardeen-Petterson effect (Bardeen & Petterson 1975). In tidal disruption events (TDEs) in which a super-massive black hole starts to accrete the bound debris, if the black hole is spinning, in general the stellar orbit is inclined with the black more...

Filippo Frontera: The THESEUS mission: science goals, configuration and development status

The THESEUS mission concept, proposed in response to the ESA call for medium-size mission (M5) within the Cosmic Vision Programme, has been selected to enter an assessment (0/A) phase study. The main scientific goals of THESEUS are: a) to explore the Early Universe (cosmic dawn and reionization era) by unveiling a complete census of the Gamma-Ray Burst (GRB) population in the first billion years in order to perform unprecedented studies of the global star formation history of the Universe up more...

Filippo Frontera: The high energy gamma-ray mission concept ASTENA

Within the context of the European project AHEAD, a new concept of high energy mission named ASTENA (Advanced Surveyor of Transient Events and Nuclear Astrophysics) is being performed. The mission includes a large array of broad band (1-20 MeV) Wide Field Monitors with imaging and spectroscopy capabilities (WFM-IS), and a large effective area broad-band (50-700 keV) Narrow Field Telescope (NFT) with focusing capabilities based on the use of an advanced Laue lens with unprecedented sensitivity. ASTENA is expected to be more...

Landgraf Boris: Optics development for ATHENA

Randall McEntaffer: Advancements in reflection gratings for astronomical spectrographs

I will present an overview of the current state of reflection gratings for astronomical spectrographs. This will concentrate on gratings fabricated for X-ray and ultraviolet architectures. The talk will cover the current technological challenges and paths forward. The application of such gratings toward future missions including suborbital rockets, Explorers, and Lynx will also be discussed

Yuichiro Ezoe: Ultra light-weight X-ray telescopes for future Japanese missions

Toward a new era of X-ray astronomy, next generation X-ray optics are indispensable. To meet a demand for telescopes lighter than the foil optics but with a better angular resolution less than 1 arcmin, we are developing micropore X-ray optics based on micromaching technologies. Using hot plastic deformation of silicon wafers, we are also developing mirrors for telescopes as light as foil optics but with better resolution. In this talk, I will review our development.

Bernd Aschenbach: QPOs of black holes explained by frequency resonances of epicyclic motions in the accretion disk

Over more than 15 years QPOs, both twin QPOs but also single QPOs, have been observed at high and low frequencies. The associated black holes have masses ranging from stellar size to supermassive galactic nuclei. This group, despite the large range of masses, is fairly small in number. I suggest that this distinctiveness is the result of a common parameter and this is the maximum spin a black hole can manage.

Yong Chen: Progress of Follow-up X-ray Telescope onboard Einstein Probe mission

to be uploaded

Yanji Yang: Development of X-ray Optics of Spectroscopic Focusing Array onboard the enhanced X-ray Timing and Polarimetry mission (eXTP)

to be uploaded

Drew Miles: Preliminary design of a new diffuse soft X-ray spectrometer for sounding rockets (poster)

I will present an early look at the design of a soft X-ray spectrometer designed to observe diffuse sources from a sounding rocket. The funded payload is estimated to launch in 2021. I provide here an update on the optical design, efforts in grating development, and detector solutions for the instrument.

Nozomi Nakaniwa: Development of a silicon mirror for future X-ray missions using the hot plastic deformation process

Silicon has a potential to be used for an X-ray mirror substrate, since it is material of low density and high mechanical stiffness, and its wafer with quite smooth surface is commercially available. Moreover, silicon has ductility near its melting point, it is possible to deform with its surface smoothness unchanged. Utilizing this characteristic, we have been manufacturing a conical silicon mirror from its wafer by means of the hot plastic deformation technique. Our mirror is the conical silicon mirror more...

Nozomi Nakaniwa: Development of a silicon mirror for future X-ray missions using the hot plastic deformation process

Silicon has a potential to be used for an X-ray mirror substrate, since it is material of low density and high mechanical stiffness, and its wafer with quite smooth surface is commercially available. Moreover, silicon has ductility near its melting point, it is possible to deform with its surface smoothness unchanged. Utilizing this characteristic, we have been manufacturing a conical silicon mirror from its wafer by means of the hot plastic deformation technique. Our mirror is the conical silicon mirror more...

Vadim Burwitz: AHEAD: the Project and its Joint Research Activity on X-ray optics

An overview of the european unions H2020 AHEAD project will be given. Followed by an overview of the work done within the AHEAD joint research activity on X-ray optics in conjunction with PANTER X-ray test facility on the characterisation and simulation of different X-ray optics technologies. Also the positive impact of AHEAD on the development of the BEaTRiX test facility for testing silicon pore optic will be discussed.

Vladimír Karas: Orbiting blobs in SMBH accretion discs in the era of high-angular resolution and polarimetry

Energy shifts of radiation are caused by the fast orbital motion and the gravitational redshift near a supermassive black hole (SMBH). Individual clumps of matter experience the effects of general relativity (GR) as they gradually proceed towards the event horizon. The supply of material is maintained by episodic tidal disruption events (TDE). The emerging radiation is modulated in the X-ray domain as well as in longer wavelengths. Changes of polarization properties of the observed signal exhibit a specific dependence on more...

Vladimír Karas: Modelling the jet kinematics of OJ287 (poster)

OJ287 belongs to one of the best candidates among active galactic nuclei to host the binary supermassive black hole at very close separation. Based on a recent analysis of 120 VLBA (Very Long Baseline Array) observations by Britzen et al. (2018), we set up a basic kinematical model to explain the motion of jet components. The model involves the jet precession, on top of which we find an indication of additional nutation-like motion for the first time. An alternative explanation more...

Benjamin Donovan: Performance testing of X-ray reflection grating prototypes for the Off-plane Grating Rocket Experiment