Search Publications
Mass distribution in the most X-ray-luminous galaxy cluster RX J1347.5-1145 studied with XMM-Newton
Schindler, S.; Gitti, M.; Piffaretti, R.
Context: We report on the analysis of XMM-Newton observations of RX J1347.5-1145 (z=0.451), the most X-ray-luminous galaxy cluster.
Aims: We present a detailed total and gas mass determination up to large distances (~1.7 Mpc), study the scaling properties of the cluster, and explore the role of AGN heating in the cluster cool core.
Methods…
GRB 070311: a direct link between the prompt emission and the afterglow
Troja, E.; Covino, S.; D'Avanzo, P. +30 more
Context: The prompt emission of gamma-ray bursts is mostly thought to be produced in internal shocks of relativistic shells emitted by the progenitor at different times, whereas the late multi-band afterglow is interpreted as the synchrotron emission of electrons swept up by the fireball expanding through the surrounding interstellar medium. The s…
Kinematics of planet-host stars and their relation to dynamical streams in the solar neighbourhood
Pont, F.; Santos, N. C.; Mayor, M. +2 more
We present a detailed study on the kinematics of metal-rich stars with and without planets, and their relation to the Hyades, Sirius and Hercules dynamical streams in the solar neighbourhood. Accurate kinematics have been derived for all the stars belonging to the CORALIE planet search survey. We used precise radial velocity measurements and CCF p…
The highly obscured region around PKS 1343 - 601 . I. Galactic interstellar extinctions using DENIS galaxy colours
Woudt, P. A.; Schröder, A. C.; Kraan-Korteweg, R. C. +1 more
The highly obscured radio-bright galaxy
The X-ray activity-rotation relation of T Tauri stars in Taurus-Auriga
Audard, M.; Güdel, M.; Grosso, N. +9 more
Context: The Taurus-Auriga star-forming complex hosts the only population of T Tauri stars in which an anticorrelation of X-ray activity and rotation period has been observed.
Aims: We aim to explain the origin of the X-ray activity-rotation relation in Taurus-Auriga. We also aim to put the X-ray activity of these stars into the context of the…
The extended structure of the remote cluster B514 in M 31. Detection of extra-tidal stars
Bellazzini, M.; Galleti, S.; Federici, L. +3 more
Aims:We present a study of the density profile of the remote M 31 globular cluster B514, obtained from HST/ACS observations.
Methods: By coupling analysis of the distribution of the integrated light with star counts, we are able to reliably follow the profile of the cluster out to r ~ 35 arcsec, corresponding to ≃130 pc. The profile is well-fi…
Three-dimensional reconstruction of the streamer belt and other large-scale structures of the solar corona. I. Method
Llebaria, A.; Lamy, P.; Vibert, D. +1 more
Context: The high spatial resolution, white-light images obtained by the LASCO coronagraphs provide a detailed record of the solar corona over almost a full solar cycle. Their analysis and interpretation poses a formidable challenge for ultimately retrieving the 3-dimensional distribution of electrons in the corona.
Aims: Our goal is to implem…
In search of an unbiased temperature estimator for statistically poor X-ray spectra
Molendi, S.; Leccardi, A.
Although commonly employed by X-ray astronomers, maximum likelihood estimators are known to be biased. In this paper we investigate the bias associated with the measure of the temperature from an X-ray thermal spectrum. We show that, in the case of low surface brightness regions, commonly adopted estimators, such as those based on χ2 an…
Intensity variations inside supergranules
Roudier, Th.; Meunier, N.; Tkaczuk, R.
Context: The convective origin of supergranulation is highly controversial. Past measurements of intensity variations inside supergranules have often been influenced by the brightness enhancement at the cell boundaries due to the magnetic network.
Aims: We conduct a precise determination of intensity variations inside supergranules.
Method…
PAHs in the halo of NGC 5529
Madden, S.; Parkin, T.; Irwin, J. A. +1 more
We present sensitive ISO λ 6.7~µm observations of the edge-on galaxy, NGC 5529, finding an extensive MIR halo around NGC 5529. The emission is dominated by PAHs in this band. The PAH halo has an exponential scale height of 3.7 kpc but can still be detected as far as ≈10 kpc from the plane to the limits of the high dynamic range (1770/1) data…