A low luminosity state in the massive X-ray binary SAX J0635+0533 (2009)
Mereghetti, Sandro, La Palombara, Nicola
The X-ray pulsar SAX J0635+0533 was repeatedly observed with the XMM-Newton satellite in 2003-2004. The precise localization provided by these observations confirms the association of SAX J0635+0533...
Recent results on magnetars (2009)
Several observations obtained in the last few years indicate that Soft Gamma-ray Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs) are basically a single class of isolated neutron stars. Their...
The first outburst of the new magnetar candidate SGR 0501+4516 (2009)
Rea, Nanda, Israel, GianLuca, Turolla, Roberto, Esposito, Paolo, Mereghetti, Sandro, Gotz, Diego, ...
We report here on the outburst onset and evolution of the new Soft Gamma Repeater SGR 0501+4516. We monitored the new SGR with XMM-Newton starting on 2008 August 23, one day after the source became...
The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars (2008)
Two classes of X-ray pulsars, the Anomalous X-ray Pulsars and the Soft Gamma-ray Repeaters, have been recognized in the last decade as the most promising candidates for being magnetars: isolated...
1E161348-5055 in the Supernova Remnant RCW 103: A Magnetar in a Young Low Mass Binary System? (2008)
Pizzolato, Fabio, Colpi, Monica, De Luca, Andrea, Mereghetti, Sandro, Tiengo, Andrea
We suggest that the unique X-ray source 1E161348-5055 at the centre of the supernova remnant RCW 103 consists of a neutron star in close orbit with a low mass main sequence star. The time signature...
Götz, Diego, Mereghetti, Sandro, Hurley, Kevin, Mirabel, I. Félix, Esposito, Paolo, Tiengo, Andrea, ...
XMM-Newton discovery of 7 s pulsations in the isolated neutron star RX J1856.5-3754 (2006)
Tiengo, Andrea, Mereghetti, Sandro
Thanks to the high counting statistics provided by a recent XMM-Newton observation of RX J1856.5-3754, we have discovered that this isolated neutron star pulsates at a period of 7.055 s. This...
Sidoli, Lara, Paizis, Ada, Mereghetti, Sandro
The hard X-ray source IGRJ11215-5952, discovered with INTEGRAL during a brief outburst in 2005, has been proposed as a new member of the class of Supergiant Fast X-ray Transients. Analysing archival...
Sidoli, Lara, Paizis, Ada, Bazzano, Angela, Mereghetti, Sandro
The X-ray burster 4U1850-087, located in the globular cluster NGC6712, is an ultracompact binary likely harbouring a degenerate companion.The source has been observed with INTEGRAL several times,...
Sidoli, Lara, Pellizzoni, Alberto, Vercellone, Stefano, Moroni, Michele, Mereghetti, Sandro, Tavani, Marco
We report the results of XMM-Newton and BeppoSAX observations of the radio and X-ray emitting star LS I +61 303, likely associated with the gamma-ray source 2CG 135+01 and recently detected also at...
La Palombara, Nicola, Mereghetti, Sandro
We report on the XMM-Newton observation of the Be/neutron star X-ray binary system RX J0146.9+6121, a long period (~ 23 m) pulsar in the NGC 663 open cluster. The X-ray luminosity decreased by a...
Tiengo, Andrea, Mereghetti, Sandro
Scattering by interstellar dust grains can produce time variable X-ray halos around gamma-ray bursts (GRB). In particular, an X-ray expanding ring is expected when a short pulse of X-ray radiation is...
Israel, GianLuca, Covino, Stefano, Mignani, Roberto, Stella, Luigi, Marconi, Gianni, Testa, Vincenzo, ...
The sky region including the Chandra position of SGR 1806-20 was monitored in the IR band during 2004, following its increased high energy bursting activity. Observations were performed using...
In the last few years it has been recognized that two apparently distinct classes of peculiar high-energy sources are actually related and can be explained as young neutron stars with magnetic fields...
La Palombara, Nicola, Mereghetti, Sandro
We report the results of an observation of the galactic black-hole binary 4U 1543-475 performed by XMM-Newton on 2002 August 18, about two months after the start of an outburst detected by Rossi-XTE....
Systematic Search for Short-transients and Pulsation Events from INTEGRAL Survey Data (2004)
Ebisawa, Ken, Kretschmar, Peter, Mowlavi, Nami, Paizis, Ada, Produit, Nicolas, Shaw, Simon, ...
The imaging instruments on board INTEGRAL have wide fields of view and high time resolution. Therefore, they are ideal instruments to search for pulsating sources and/or transient events. We are...
Caraveo, Partrizia, De Luca, Andrea, Mereghetti, Sandro, Pellizzoni, Alberto, Bignami, Giovanni, Tur, Anatoly, ...
Unveiling the multi-wavelength phenomenology of Anomalous X-ray Pulsars (2003)
Israel, GianLuca, Stella, Luigi, Covino, Stefano, Campana, Sergio, Angelini, Lorella, Mignani, Roberto, ...
During 2002-2003 the number of IR-identified counterparts to the Anomalous X-ray Pulsars (AXPs) has grown to four (4U0142+614, 2E2259+584, 1E 1048-59 and 1RXS J170849-400910) out of the six assessed...
Unveiling the nature of the 321s Orbital Period X-ray source RX J0806.3+1527 (2003)
Israel, GianLuca, Stella, Luigi, Covino, Stefano, Campana, Sergio, Marconi, Gianni, Mauche, Christopher W., ...
A nearly simultaneous X-ray/optical (Chandra and VLT) observational campaign of RX J0806.3+1527 has been carried out during November 2001. These observations allowed us to phase the X-ray and optical...
Rea, Nanda, Israel, Gian Luca, Stella, Luigi, Oosterbroek, Tim, Mereghetti, Sandro, Angelini, Lorella, ...
We report the results of a long observation of the anomalous X-ray pulsar 1RXS J170849-400910 obtained with the BeppoSAX satellite in August 2001. The best-fit phase-averaged spectrum was an absorbed...
The broad band X-ray spectrum of the black hole candidate GRS1758-258 (2002)
Sidoli, Lara, Mereghetti, Sandro
We present the results of a BeppoSAX observation of the black hole candidate GRS1758-258 carried out in 1997, while the source was in its low/hard state. The X-ray spectrum, simultaneously observed...
Re-examining the X-Ray versus Spin-Down Luminosity Correlation of Rotation Powered Pulsars (2001)
Possenti, Andrea, Cerutti, Rossella, Colpi, Monica, Mereghetti, Sandro
The empirical relation between the X-ray luminosity (in the 2-10 keV band) and the rate of spin-down energy loss of a sample of 37 pulsars is re-examined considering recent data from ASCA, RXTE,...
The X-ray sources at the center of the supernova remnant RXJ0852.0-4622 (2000)
We present a BeppoSAX observation of the X-ray source AX J0851.9-4617.4 that has been proposed as the neutron star associated to the shell like-supernova remnant RX J0852.0-4622. The image at E>5 keV...
BeppoSAX observation of Cen X-4 in quiescence (2000)
Campana, Sergio, Stella, Luigi, Mereghetti, Sandro, Cremonesi, Davide
We report on a 61 ks BeppoSAX observation of the soft X-ray transient Cen X-4 during quiescence which allowed to study the source X-ray spectrum from ~ 0.3 keV to ~ 8 keV. A two-component spectral...
Further evidence that 1RXS J170849.0-400910 is an Anomalous X-ray pulsar (1999)
Israel, GianLuca, Covino, Stefano, Stella, Luigi, Campana, Sergio, Mereghetti, Sandro
We report the results of two ROSAT HRI observations of the recently discovered 11s X-ray pulsar 1RXS J170849.0-400910. A refined position with a smaller error radius (10" uncertainty) and a new spin...
BeppoSAX and ASCA observations of the Galactic Bulge source 1E1743.1-2843 (1999)
Cremonesi, Davide I., Mereghetti, Sandro, Sidoli, Lara, Israel, GianLuca
We report the results of BeppoSAX and ASCA observations of the X-ray source 1E1743.1-2843, located in the region of the galactic center, performed between 1993 and 1998. Observations spanning almost...