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Multiwavelength Observations of Fast Radio Bursts
Zampieri, Luca; Turatto, Massimo; Nicastro, Luciano +3 more
The origin and phenomenology of the Fast Radio Burst (FRB) remains unknown despite more than a decade of efforts. Though several models have been proposed to explain the observed data, none is able to explain alone the variety of events so far recorded. The leading models consider magnetars as potential FRB sources. The recent detection of FRBs fr…
Space-Based Photometry of Binary Stars: From Voyager to TESS
Southworth, John
Binary stars are crucial laboratories for stellar physics, so have been photometric targets for space missions beginning with the very first orbiting telescope (OAO-2) launched in 1968. This review traces the binary stars observed and the scientific results obtained from the early days of ultraviolet missions (OAO-2, Voyager, ANS, IUE), through a …
Multi-Wavelength Properties of the 2021 Periastron Passage of PSR B1259-63
Santangelo, Andrea; Pühlhofer, Gerd; Chernyakova, Maria +9 more
PSR B1259-63 is a gamma-ray binary system hosting a radio pulsar orbiting around a O9.5Ve star, LS 2883, with a period of ∼3.4 years. The interaction of the pulsar wind with the LS 2883 outflow leads to unpulsed broadband emission in the radio, X-ray, GeV, and TeV domains. One of the most unusual features of the system is an outburst of GeV energi…
Project MOMO: Multiwavelength Observations and Modeling of OJ 287
Ciprini, S.; Komossa, S.; Gallo, L. C. +9 more
Our project MOMO (Multiwavelength observations and modeling of OJ 287) consists of dedicated, dense, long-term flux and spectroscopic monitoring, and deep follow-up observations of the blazar OJ 287 at >13 frequencies from the radio to the X-ray band since late 2015. In particular, we are using Swift to obtain optical-UV-X-ray spectral energy d…
Blocks Size Frequency Distribution in the Enceladus Tiger Stripes Area: Implications on Their Formative Processes
Lucchetti, Alice; Pajola, Maurizio; Cremonese, Gabriele +1 more
We study the size frequency distribution of the blocks located in the deeply fractured, geologically active Enceladus South Polar Terrain with the aim to suggest their formative mechanisms. Through the Cassini ISS images, we identify ~17,000 blocks with sizes ranging from ~25 m to 366 m, and located at different distances from the Damascus, Baghda…
A Long-Term Study of Ultraluminous X-ray Sources in NGC 891
Earley, Nicholas M.; Dwarkadas, Vikram V.; Cirillo, Victoria
We perform empirical fits to the Chandra and XMM-Newton spectra of three ultraluminous X-ray sources (ULXs) in the edge-on spiral galaxy NGC 891, monitoring the region over a 17-year time window. One of these sources was visible since the early 1990s with ROSAT and was observed multiple times with Chandra and XMM-Newton. Another was visible since …
Searching for Gamma-Ray Binaries in Multiwavelength Catalogs
Luque-Escamilla, Pedro L.; Martí, Josep
The number of gamma-ray binaries currently known is still so small that even a new finding represents a significant expansion of its population. We present a possible hunting strategy based on screening different catalogs to filter potential peculiar stars consistent with gamma-ray sources whose association at lower energies is not yet certain. So…
INTEGRAL View of TeV Sources: A Legacy for the CTA Project
Ubertini, Pietro; Bazzano, Angela; Bird, Antony J. +7 more
Investigations that were carried out over the last two decades with novel and more sensitive instrumentation have dramatically improved our knowledge of the more violent physical processes taking place in galactic and extra-galactic Black-Holes, Neutron Stars, Supernova Remnants/Pulsar Wind Nebulae, and other regions of the Universe where relativi…