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A phase-resolved Fermi-LAT analysis of the mode-changing pulsar PSR J2021+4026 shows hints of a multipolar magnetosphere
A. Fiori, M. Razzano, A. K. Harding +3
The goal of our work is to study the mode changes of the radio-quiet gamma-ray pulsar PSR J2021+4026 with improved detail. By accurately characterizing variations in the gamma-ray…
Radio pulsations from the -ray millisecond pulsar PSR J2039-5617
A. Corongiu, R. P. Mignani, A. S. Seyffert +9
The predicted nature of the candidate redback pulsar 3FGL\,J2039.65618 was recently confirmed by the discovery of -ray millisecond pulsations (Clark et al. 2020, hereafter Pa…
Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 during the initial 3.5 years of outburst decay
F. Coti Zelati, N. Rea, R. Turolla +15
We report on 3.5 years of Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 since its outburst onset in April 2013. The magnetar spin-down has shown at least two ep…
Evidence for vacuum birefringence from the first optical polarimetry measurement of the isolated neutron star RX\, J1856.53754
R. P. Mignani, V. Testa, D. Gonzalez Caniulef +4
The "Magnificent Seven" (M7) are a group of radio-quiet Isolated Neutron Stars (INSs) discovered in the soft X-rays through their purely thermal surface emission. Owing to the larg…
Searching for the optical counterparts of two young gamma-ray pulsars
R. P. Mignani, V. Testa, M. Marelli +7
We report on the first deep optical observations of two -ray pulsars, both among the very first discovered by the {\em Fermi} Gamma-ray Space Telescope. The two pulsars are the…
Observations of three young gamma-ray pulsars with the Gran Telescopio Canarias
R. P. Mignani, N. Rea, V. Testa +6
We report the analysis of the first deep optical observations of three isolated -ray pulsars detected by the {\em Fermi Gamma-ray Space Telescope}: the radio-loud PSR\, J0248+60…
The X-ray outburst of the Galactic Centre magnetar SGR J1745-2900 during the first 1.5 year
F. Coti Zelati, N. Rea, A. Papitto +17
In 2013 April a new magnetar, SGR 1745-2900, was discovered as it entered an outburst, at only 2.4 arcsec angular distance from the supermassive black hole at the Centre of the Mil…
The birthplace and age of the isolated neutron star RX J1856.5-3754
R. P. Mignani, D. Vande Putte, M. Cropper +6
X-ray observations unveiled various types of radio-silent Isolated Neutron Stars (INSs), phenomenologically very diverse, e.g. the Myr old X-ray Dim INS (XDINSs) and the kyr old ma…
A new low-B magnetar: Swift J1822.3-1606
A. Camero-Arranz, N. Rea, G. L. Israel +16
We report on the long term X-ray monitoring with Swift, RXTE, Suzaku, Chandra, and XMM-Newton of the outburst of the newly discovered magnetar Swift J1822.3-1606 (SGR 182-1606), fr…
New VLT observations of the Fermi pulsar PSR J1048-5832
M. Razzano, R. P. Mignani, M. Marelli +1
PSR J1048-5832 is a Vela-like (P=123.6 ms; tau~20.3 kyr) gamma-ray pulsar detected by Fermi, at a distance of ~2.7 kpc and with a rotational energy loss rate dot{E}_{SD} ~2 x 10^{3…
A Statistical Approach to Recognizing Source Classes for Unassociated Sources in the First Fermi-LAT Catalog
LAT Collaboration
The Fermi Large Area Telescope First Source Catalog (1FGL) provided spatial, spectral, and temporal properties for a large number of gamma-ray sources using a uniform analysis meth…
VLT/FORS2 observations of the optical counterpart of the isolated neutron star RBS 1774
R. P. Mignani, S. Zane, R. Turolla +5
X-ray observations performed with ROSAT led to the discovery of a group (seven to date) of X-ray dim and radio-silent middle-aged isolated neutron stars (a.k.a. XDINSs), which are…
Neutron Star Astronomy with the HST
R. P. Mignani
Since its launch in 1990, HST has played a leading role in optical studies of isolated neutron stars, both radio-loud pulsars and radio-silent ones, paving the way to follow-up obs…
Discovery of 59ms Pulsations from 1RXS J141256.0+792204 (Calvera)
S. Zane, F. Haberl, G. L. Israel +10
We report on a multi-wavelength study of the compact object candidate 1RXS J141256.0+792204 (Calvera). Calvera was observed in the X-rays with XMM/EPIC twice for a total exposure t…
Early X-ray and optical observations of the soft gamma-ray repeater SGR 0418+5729
P. Esposito, G. L. Israel, R. Turolla +13
Emission of two short hard X-ray bursts on 2009 June 5 disclosed the existence of a new soft gamma-ray repeater, now catalogued as SGR 0418+5729. After a few days, X-ray pulsations…
VLT optical observations of the isolated neutron star RX J0420.0-5022
R. P. Mignani, C. Motch, F. Haberl +3
X-ray observations performed with ROSAT led to the discovery of 7 radio-silent isolated neutron stars (INSs) which are detected only through the relatively dim and purely thermal X…
Optical pulsations from the anomalous X-ray pulsar 1E 1048.1-5937
V. S. Dhillon, T. R. Marsh, S. P. Littlefair +7
We present high-speed optical photometry of the anomalous X-ray pulsar 1E 1048.1-5937 obtained with ULTRACAM on the 8.2-m Very Large Telescope in June 2007. We detect 1E 1048.1-593…