M. Klein Wolt

Radboud University Nijmegen

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H. Falcke

Radboud University Nijmegen

R. Wijnands

University of Amsterdam

C. B. Markwardt

Goddard Space Flight Center

Albert‐Jan Boonstra

Netherlands Institute for Radio Astronomy

J. H. Swank

Goddard Space Flight Center

A. Aminaei

University of California, Davis

Linjie Chen

National Astronomical Observatories

Baptiste Cecconi

Laboratoire d’études spatiales et d’instrumentation en astrophysique

L. V. E. Koopmans

University of Groningen

Mark Bentum

Eindhoven University of Technology

Cooperative Institutions

Netherlands Institute for Radio Astronomy

Centre National de la Recherche Scientifique

Radboud University Nijmegen

Sorbonne Université

Chinese Academy of Sciences

University of California, Berkeley

Université Paris Cité

Observatoire de Paris

Laboratoire d’études spatiales et d’instrumentation en astrophysique

University of Amsterdam

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A bright outburst of IGR J17191-2821 and detection of a type-I X- ray burst

The astronomer's telegram (2007)

M. Klein Wolt R. Wijnands J. H. Swank C. B. Markwardt

The transient IGR J17191-2821 (Atels #1021,#1022,#1025) has reached a state of increase activity demonstrating a bright outburst. During RXTE/PCA bulge scan observations taken on April 29 (14:39:50 UTC) and May 2 (16:30:43 UTC) the source was detected at a level of ~30 and ~70 mCrab (2-10 keV), respectively. During a Swift/XRT TOO observation (1 ksec) on May 1 (13:03:20 UTC) we detected the source at a high level of ~1.2E-9 erg/sec/cm^2, corresponding to ~ 46 mCrab (absorbed 2-10 keV flux).

Swift

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MeerLICHT and BlackGEM: custom-built telescopes to detect faint optical transients

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2016)

S. Bloemen P. Groot P. A. Woudt M. Klein Wolt V. A. McBride

We present the MeerLICHT and BlackGEM telescopes, which are wide-field optical telescopes that are currently being built to study transient phenomena, gravitational wave counterparts and variable stars. The telescopes have 65 cm primary mirrors and a 2.7 square degree field-of-view. The MeerLICHT and BlackGEM projects have different science goals, but will use identical telescopes. The first telescope, MeerLICHT, will be commissioned at Sutherland (South Africa) in the first quarter of 2017. It will co-point with MeerKAT to collect optical data commensurate with the radio observations. After careful analysis of MeerLICHT's performance, three telescopes of the same type will be commissioned in La Silla (Chile) in 2018 to form phase I of the BlackGEM array. BlackGEM aims at detecting and characterizing optical counterparts of gravitational wave events detected by Advanced LIGO and Virgo. In this contribution we present an overview of the science goals, the design and the status of the two projects.

Optical telescope

10.1117/12.2232522

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Low frequency radioastronomy of the inner heliosphere: the way forward.

HAL (Le Centre pour la Communication Scientifique Directe) (2014)

Baptiste Cecconi Philippe Zarka J. Bergman H. Falcke Albert‐Jan Boonstra

Heliosphere

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1 Hz FLARING IN SAX J1808.4–3658: FLOW INSTABILITIES NEAR THE PROPELLER STAGE

The Astrophysical Journal (2009)

Alessandro Patruno Anna L. Watts M. Klein Wolt R. Wijnands M. van der Klis

We present a simultaneous periodic and aperiodic timing study of the accreting millisecond X-ray pulsar SAX J1808.4-3658. We analyze five outbursts of the source and for the first time provide a full and systematic investigation of the enigmatic phenomenon of the 1 Hz flares observed during the final stages of some of the outbursts. We show that links between pulsations and 1 Hz flares might exist, and suggest that they are related with hydrodynamic disk instabilities that are triggered close to the disk–magnetosphere boundary layer when the system is entering the propeller regime.

Aperiodic graph

Flare

10.1088/0004-637x/707/2/1296

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Citations (58)

Pointed RXTE observations of SAX J1808.4-3658

ATel (2005)

R. Wijnands M. Klein Wolt M. Linares M. van der Klis Deepto Chakrabarty

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Burst Oscillations from IGR J17191-2821 Imply a 294 Hz Spin Frequency

The astronomer's telegram (2007)

C. B. Markwardt M. Klein Wolt J. H. Swank R. Wijnands

The X-ray transient IGR J17191-2821 was detected by INTEGRAL (ATEL #1021) and shown to have a rapid variability and decay (ATEL #1022, ATEL #1025). A more recent report of activity by RXTE and Swift (ATEL #1065) has revealed X-ray bursts, identifying this source as a neutron star system. Recent PCA data suggests a decline from outburst peak. In an RXTE PCA observation on 2007 May 4 (01:33 UTC), we detect a 2-10 keV persistent flux level of about 85 mCrab.

Swift

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Low frequency radioastronomy of the inner heliosphere: the way

Baptiste Cecconi P. Zarka J. Bergman H. Falcke Albert‐Jan Boonstra

Heliosphere

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MeerCRAB: MeerLICHT classification of real and bogus transients using deep learning

Experimental Astronomy (2021)

Zafiirah Hosenie S. Bloemen P. Groot R. J. P. Lyon B. Scheers

Vetting

Terabyte

Transient (computer programming)

Ground truth

10.1007/s10686-021-09757-1

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Radio Detection of Cosmic Rays and Neutrinos on the Moon

A. Aminaei M. Klein Wolt L. Chen Thomas Bronzwaer Hamid Reza Pourshaghaghi

European Planetary Science Congress 2013 University College London 08 – 13 September 2013, London, United Kingdom

Cosmic neutrino background

Background radiation

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Detection of Ultra High Energy Cosmic Rays and Neutrinos with Lunar Orbital Radio Telescope

arXiv (Cornell University) (2023)

Linjie Chen M. Klein Wolt A. Aminaei S. Buitink H. Falcke

Particle cascades induced by ultra-high-energy (UHE) cosmic rays and neutrinos impacting on the lunar regolith usually radiate Cherenkov radio emissions due to the presence of excess negative charge, which is known as Askaryan effect. Several experiments have been carried out to detect the Cherenkov radio emissions in the lunar regolith. To prepare for future lunar Ultra-Long Wavelength (ULW, frequencies below 30 MHz) radio astronomy missions, we study the detection of the Cherenkov radio emissions with the ULW radio telescope that are operating at the lunar orbit. We have carried out instrument modelling and analytic calculations for the analysis of aperture, flux and event rate, and the analyses show the detectability of the Cherenkov radiation. Based on the properties of the Cherenkov radiation, we have demonstrated that the cosmic ray and neutrino events could be reconstructed with the three ULW vector antennas onboard the lunar satellites via measurements of the Askaryan radio pulse intensity, polarizations, etc. The results obtained by this study would be useful for future lunar radio explorer mission, where the detections of UHE cosmic rays and neutrinos could be successfully attempted.

Regolith

Cherenkov Telescope Array

10.48550/arxiv.2301.11830

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