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XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J0440.9+4431
N. La Palombara, L. Sidoli, P. Esposito +2
Many X-ray accreting pulsars have a soft excess below 10 keV. This feature has been detected also in faint sources and at low luminosity levels, suggesting that it is an ubiquitous…
A time-variable, phase-dependent emission line in the X-ray spectrum of the isolated neutron star RX J0822-4300
A. De Luca, D. Salvetti, A. Sartori +9
RX J0822-4300 is the Central Compact Object associated with the Puppis A supernova remnant. Previous X-ray observations suggested RX J0822-4300 to be a young neutron star with a we…
Search for X-ray emission from subdwarf B stars with compact companion candidates
Sandro Mereghetti, Sergio Campana, Paolo Esposito +2
Stellar evolutionary models predict that most of the early type subdwarf stars in close binary systems have white dwarf companions. More massive companions, such as neutron stars o…
The progenitor of a type Ia supernova with a short delay time?
S. Mereghetti, N. La Palombara, A. Tiengo +3
HD49798/RXJ0648.0-4418 is the only known X-ray binary composed of a hot subdwarf and a massive white dwarf (M=1.28+/-0.05 Msun). This system, with an orbital period of 1.55 days, i…
Highly absorbed X-ray binaries in the Small Magellanic Cloud
G. Novara, N. La Palombara, S. Mereghetti +12
Many of the high mass X-ray binaries (HMXRBs) discovered in recent years in our Galaxy are characterized by a high absorption, most likely intrinsic to the system, which hampers th…
X-ray and optical observations of the unique binary system HD49798/RXJ0648.0-4418
S. Mereghetti, N. La Palombara, A. Tiengo +5
We report the results of XMM-Newton observations of HD49798/RXJ0648.0-4418, the only known X-ray binary consisting of a hot sub-dwarf and a white dwarf. The white dwarf rotates ver…
Long-term spectral and timing properties of the soft gamma-ray repeater SGR 1833-0832 and detection of extended X-ray emission around the radio pulsar PSR B1830-08
P. Esposito, G. L. Israel, R. Turolla +19
SGR 1833-0832 was discovered on 2010 March 19 thanks to the Swift detection of a short hard X-ray burst and follow-up X-ray observations. Since then, it was repeatedly observed wit…
The first deep X-ray and optical observations of the closest isolated radio pulsar
A. Tiengo, R. Mignani, A. De Luca +3
With a distance of 170 pc, PSR J2144-3933 is the closest isolated radio pulsar currently known. It is also the slowest and least energetic radio pulsar; indeed, its radio emission…
IKT 16: A Composite SNR in the SMC
R. A. Owen, M. D. Filipovic, J. Ballet +11
Aims: IKT 16 is an X-ray and radio-faint supernova remnant (SNR) in the Small Magellanic Cloud (SMC). A previous X-ray study of this SNR found a hard X-ray source near its centre.…
The XMM-Newton survey of the Small Magellanic Cloud: XMMUJ005011.2-730026 = SXP214, a Be/X-ray binary pulsar
M. J. Coe, F. Haberl, R. Sturm +10
In the course of the XMM-Newton survey of the Small Magellanic Cloud (SMC), a region to the east of the emission nebula N19 was observed in November 2009. To search for new candida…
Multi-instrument X-ray monitoring of the January 2009 outburst from the recurrent magnetar candidate 1E 1547.0-5408
F. Bernardini, G. L. Israel, L. Stellaınst +9
With two consecutive outbursts recorded in four months (October 2008 and January 2009), and a possible third outburst in 2007, 1E 1547.0-5408 is one of the most active transient an…
X-ray and optical observations of the closest isolated radio pulsar
A. Tiengo, R. P. Mignani, A. De Luca +3
With a parallactic distance of 170 pc, PSR J2144-3933 is the closest isolated radio pulsar currently known. It is also the slowest (P = 8.51 s) and least energetic (Edot = 2.6E28 e…
SGR 0418+5729: a low-magnetic-field magnetar
P. Esposito, N. Rea, R. Turolla +8
Soft gamma-ray repeaters and anomalous X-ray pulsars are a small (but growing) group of X-ray sources characterized by the emission of short bursts and by a large variability in th…