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A puzzling 2-hour X-ray periodicity in the 1.5-hour orbital period black widow PSR J1311-3430
Andrea De Luca, Martino Marelli, Sandro Mereghetti +3
Time-domain analysis of an archival XMM-Newton observation unveiled a very unusual variability pattern in the soft X-ray emission of PSR J1311-3430, a black widow millisecond pulsa…
Two decades of X-ray observations of the isolated neutron star RX J1856.5-3754: detection of thermal and non-thermal hard X-rays and refined spin-down measurement
Davide De Grandis, Michela Rigoselli, Sandro Mereghetti +6
The soft X-ray pulsar RX J1856.5-3754 is the brightest member of a small class of thermally-emitting, radio-silent, isolated neutron stars. Its X-ray spectrum is almost indistingui…
The first 7 months of the 2020 X-ray outburst of the magnetar SGR J1935+2154
Alice Borghese, Francesco Coti Zelati, Gian Luca Israel +10
The magnetar SGR J1935+2154 underwent a new active episode on 2020 April 27-28, when a forest of hundreds of X-ray bursts and a large enhancement of the persistent flux were detect…
Thermal and non-thermal X-ray emission from the rotation-powered radio/-ray pulsar PSR J1740+1000
Michela Rigoselli, Sandro Mereghetti, Sara Anzuinelli +4
We report the results of new XMM-Newton observations of the middle-aged (10 yr) radio pulsar PSR J1740+1000 carried out in 2017-2018. These long pointings (530 ks)…
X-ray observation of the Roche-lobe filling white dwarf plus hot subdwarf system ZTF J213056.71+442046.5
S. Mereghetti, N. La Palombara, T. Kupfer +9
ZTF J213056.71+442046.5 is the prototype of a small class of recently discovered compact binaries composed of a white dwarf and a hot subdwarf that fills its Roche-lobe. Its orbita…
Deep upper limit on the optical emission during a hard X-ray burst from the magnetar SGR J1935+2154
Luca Zampieri, Sandro Mereghetti, Roberto Turolla +9
In September 2021 the magnetar SGR J1935+2154 entered a stage of burst/flaring activity in the hard X-ray band. On September 10, 2021 we observed SGR J1935+2154 with the fiber-fed…