Search Publications
XMMU J174716.1-281048: a ``quasi-persistent'' very faint X-ray transient?
Mereghetti, S.; Sidoli, L.; Ubertini, P. +3 more
The X-ray transient XMMU J174716.1-281048 was serendipitously discovered with XMM-Newton in 2003. It lies about 0.9 degrees off the Galactic Centre and its spectrum shows a high absorption (~8× 1022 cm-2). Previous X-ray observations of the source field performed in 2000 and 2001 did not detect the source, indicative of a qui…
A cluster in a crowded environment: XMM-Newton and Chandra observations of A3558
Finoguenov, A.; Rossetti, M.; Molendi, S. +1 more
Combining XMM-Newton and Chandra data, we have performed a detailed study of Abell 3558. Our analysis shows that its dynamical history is more complicated than previously thought. We have found some traits typical of cool core clusters (surface brightness peaked at the center, peaked metal abundance profile) and others that are more common in merg…
Comparing different approaches to model the rotational modulation of the Sun as a star
Lanza, A. F.; Rodonò, M.; Bonomo, A. S.
Context: The space missions MOST, COROT and Kepler are going to provide us with high-precision optical photometry of solar-like stars with time series extending from tens of days to several years. They can be modelled to obtain information on stellar magnetic activity by fitting the rotational modulation of the stellar flux produced by the brightn…
Supermassive black holes in the Sbc spiral galaxies NGC 3310, NGC 4303 and NGC 4258
Marconi, A.; Capetti, A.; Carollo, C. M. +12 more
We have undertaken an HST Space Telescope Imaging Spectrograph survey of 54 late type spiral galaxies to study the scaling relations between black holes and their host spheroids at the low mass end. Our aim is to measure black hole masses or to set upper limits for a sizeable sample of spiral galaxies. In this paper we present new Space Telescope …
A narrow-band search for Lyα emitting galaxies at z = 8.8
Lidman, C.; Moorwood, A.; van der Werf, P. +4 more
Aims:The first star forming galaxies in the early universe should be copious Lyα emitters and may play a significant role in ionizing the intergalactic medium (IGM). It has been proposed that the luminosity function of Lyα emitting galaxies beyond z ~ 6 may be used to constrain the neutral fraction of the IGM during this epoch. In this work we rep…
The mass-energy budget of the ionised outflow in NGC 7469
Kaastra, J. S.; Kriss, G. A.; Behar, E. +6 more
Although AGN feedback through ionised winds is of great importance in models of AGN/galaxy coevolution, the mass and energy output via these winds, even in the nearby universe, is poorly understood. The issue is complicated by the wide range of ionisation in the winds, which means that multiwavelength observational campaigns are required to obtain…
WIYN open cluster study. XXVI. Improved kinematic membership and spectroscopy of IC 2391
Kozhurina-Platais, V.; Altmann, M.; Platais, I. +5 more
Context: Young open clusters provide important clues to the interface between the main sequence and pre-main-sequence phases of stellar evolution. The young and nearby open cluster IC 2391 is well-suited to studies of these two evolutionary phases.
Aims: We establish a bona fide set of cluster members and then analyze this set in terms of bina…
XMM-Newton and INTEGRAL spectroscopy of the microquasar GRO J1655-40 during its 2005 outburst
Díaz Trigo, M.; Parmar, A. N.; Kuulkers, E. +2 more
We report on two simultaneous XMM-Newton and INTEGRAL observations of the microquasar GRO J1655-40during the 2005 outburst when the source was in its high-soft state. The 0.3-200 keV spectra are complex with an overall continuum which may be modeled using an absorbed blackbody together with a weak, steep, power-law component. In addition, there is…
BLOX: the Bonn lensing, optical, and X-ray selected galaxy clusters. I. Cluster catalog construction
Schneider, P.; Maturi, M.; Schwope, A. +4 more
The mass function of galaxy clusters is an important cosmological probe. Differences in the selection method could potentially lead to biases when determining the mass function. From the optical and X-ray data of the XMM-Newton Follow-Up Survey, we obtained a sample of galaxy cluster candidates using weak gravitational lensing, the optical Postm…
The abundance pattern of O, Mg, Si, and Fe in the intracluster medium of the Centaurus cluster observed with XMM-Newton
Böhringer, H.; Matsushita, K.; Takahashi, I. +1 more
The abundances of O, Mg, Si, and Fe in the intracluster medium of the Centaurus cluster are derived. The Fe abundance has a negative radial gradient. In solar units, the Si abundance is close to the Fe abundance, while the O and Mg abundances are much lower. The high Fe/O and Si/O ratios indicate that the metal supply from supernovae Ia is importa…