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111 papers · 1 filter
XMM-Newton detects a relativistically broadened iron line in the spectrum of the ms X-ray pulsar SAX J1808.4-3658
A. Papitto, T. Di Salvo, A. D'Aì +5
We report on a 63-ks long XMM-Newton observation of the accreting millisecond pulsar SAX J1808.4-3658 during the latest X-ray outburst which started on September 21st 2008. The pn…
Updated Pre-Main Sequence tracks at low metallicities for 0.1< M/Mo<1.5
Di Criscienzo, P. Ventura, F. D'Antona
Young populations at Z<Zo are being examined to understand the role of metallicity in the first phases of stellar evolution. For the analysis it is necessary to assign mass and age…
The Environments of Active Galactic Nuclei within the zCOSMOS Density Field
J. D. Silverman, K. Kovac, C. Knobel +58
The impact of environment on AGN activity up to z~1 is assessed by utilizing a mass-selected sample of galaxies from the 10k catalog of the zCOSMOS spectroscopic redshift survey. W…
Phase resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during the 2008 outburst
R. Cornelisse, P. D'Avanzo, T. Munoz-Darias +6
aims: We obtained phase-resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during its outburst in 2008 to find a signature of the donor star, constrai…
Discovery of a rapidly pulsating subdwarf B star candidate in omega Cen
S. K. Randall, A. Calamida, G. Bono
We report the discovery of the first variable extreme horizontal branch star in a globular cluster (omega Cen). The oscillation uncovered has a period of 114 s and an amplitude of…
XMM-Newton discovery of 2.6 s pulsations in the soft gamma-ray repeater SGR 1627-41
P. Esposito, A. Tiengo, S. Mereghetti +6
After nearly a decade of quiescence, the soft gamma-ray repeater SGR 1627-41 reactivated on 2008 May 28 with a bursting episode followed by a slowly decaying enhancement of its per…