Search Publications

An extension of the SHARC survey

Romer, A. K.; Adami, C.; Holden, B. P. +8 more

Aims:We report on our search for distant clusters of galaxies based on optical and X-ray follow up observations of X-ray candidates from the SHARC survey, and based on the assumption that the absence of bright optical or radio counterparts to possibly extended X-ray sources could mean that they are distant clusters.
Methods: We have obtained d…

Mass distribution in the most X-ray-luminous galaxy cluster RX J1347.5-1145 studied with XMM-Newton

Schindler, S.; Gitti, M.; Piffaretti, R.

Searching for absorbed AGN in the 2XMM-Newton pre-release EPIC Serendipitous Source Catalogue

Watson, M. G.; Caccianiga, A.; Severgnini, P. +7 more

Aims:We aim to test a method of efficiently selecting X-ray obscured AGN in the 2XMM-Newton EPIC Serendipitous Source Catalogue.
Methods: By means of a strong correlation established using the XMM-Newton Hard Bright Sample between the intrinsic absorption and the hardness ratio to the 0.5-2.0 keV and 2.0-4.5 keV bands, an efficient way of sele…

Variations of the ultraviolet resonance lines of the B2 IV-V star ζ Cassiopeiae

Smith, M. A.; Bohlender, D. A.

Recently Neiner et al. reported that the B2 IV-V star ζ Cas contains a weak magnetic field which varies on the same 5.37 day period found from the modulations of its N V, C IV, and Si IV UV resonance lines. We have studied the time variable properties of the same resonance lines in greater detail to determine the physical characteristics of the ma…

A near-ultraviolet view of the inner region of M 31 with the large binocular telescope

Pasian, F.; Fontana, A.; Grazian, A. +28 more

Aims:We present a 900 s, wide-field U image of the inner region of the Andromeda galaxy obtained during the commissioning of the blue channel of the Large Binocular Camera mounted on the prime focus of the Large Binocular Telescope.
Methods: Relative photometry and absolute astrometry of individual sources in the image was obtained along with …

The Supernova Legacy Survey: measurement of Ω_M, Ω_Λ and w from the first year data set

Sullivan, M.; Lidman, C.; Aldering, G. +39 more

We present distance measurements to 71 high redshift type Ia supernovae discovered during the first year of the 5-year Supernova Legacy Survey (SNLS). These events were detected and their multi-color light-curves measured using the MegaPrime/MegaCam instrument at the Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degr…

The cosmic infrared background resolved by Spitzer. Contributions of mid-infrared galaxies to the far-infrared background

Le Floc'h, E.; Dole, H.; Lagache, G. +7 more

Aims.We quantify the contributions of 24 µm galaxies to the Far-Infrared (FIR) Background at 70 and 160 µm. We provide new estimates of the Cosmic Infrared Background (CIB), and compare it with the Cosmic Optical Background (COB).
Methods: .Using Spitzer data at 24, 70 and 160 µm in three deep fields, we stacked more than 190…

Basic physical parameters of a selected sample of evolved stars

Pasquini, L.; Weiss, A.; de Medeiros, J. R. +6 more

We present the detailed spectroscopic analysis of 72 evolved stars, which were previously studied for accurate radial velocity variations. Using one Hyades giant and another well studied star as the reference abundance, we determine the [Fe/H] for the whole sample. These metallicities, together with the T_eff values and the absolute V-band magnitu…

The Galaxy mass function up to z =4 in the GOODS-MUSIC sample: into the epoch of formation of massive galaxies

Pentericci, L.; Fontana, A.; Vanzella, E. +10 more

Aims.The goal of this work is to measure the evolution of the Galaxy Stellar Mass Function and of the resulting Stellar Mass Density up to redshift ≃4, in order to study the assembly of massive galaxies in the high redshift Universe.
Methods: .We have used the GOODS-MUSIC catalog, containing 3000 Ks-selected galaxies with multi-wavelength cov…

The Galactic WN stars. Spectral analyses with line-blanketed model atmospheres versus stellar evolution models with and without rotation

Hamann, W. -R.; Gräfener, G.; Liermann, A.

Context: .Very massive stars pass through the Wolf-Rayet (WR) stage before they finally explode. Details of their evolution have not yet been safely established, and their physics are not well understood. Their spectral analysis requires adequate model atmospheres, which have been developed step by step during the past decades and account in their…