Search Publications
The Supernova Legacy Survey: measurement of ΩM, ΩΛ 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…
The GOODS-MUSIC sample: a multicolour catalog of near-IR selected galaxies in the GOODS-South field
Fontana, A.; Vanzella, E.; Grazian, A. +6 more
Aims. We present a high quality multiwavelength (from 0.3 to 8.0 µm) catalog of the large and deep area in the GOODS Southern Field covered by the deep near-IR observations obtained with the ESO VLT. Methods. The catalog is entirely based on public data: in our analysis, we have included the F435W, F606W, F775W and F850LP ACS images, the JHK…
On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies
Cappi, M.; Iwasawa, K.; Barcons, X. +5 more
We investigate the relation between X-ray nuclear emission, optical emission line luminosities and black hole masses for a sample of 47 Seyfert galaxies. The sample, which has been selected from the Palomar optical spectroscopic survey of nearby galaxies (Ho et al. 1997a, ApJS, 112, 315), covers a wide range of nuclear powers, from L2-10 keV<…
ISM properties in low-metallicity environments
Madden, S. C.; Galliano, F.; Sauvage, M. +1 more
We present new ISOCAM mid-infrared spectra of three starbursting nearby dwarf galaxies, NGC 1569, NGC 1140 and II Zw 40 and the 30 Dor region of the LMC and explore the properties of the ISM in low-metallicity environments, also using additional sources from the literature. We analyse the various components of the ISM probed by the mid-infrared ob…
Physical parameters and wind properties of galactic early B supergiants
Crowther, P. A.; Lennon, D. J.; Walborn, N. R.
We present optical studies of the physical and wind properties, plus CNO chemical abundances, of 25 O9.5-B3 Galactic supergiants. We employ non-LTE, line blanketed, extended model atmospheres, which provide a modest downward revision in the effective temperature scale of early B supergiants of up to 1-2 kK relative to previous non-blanketed result…
Revisiting the population of Galactic open clusters
Scholz, R. -D.; Piskunov, A. E.; Kharchenko, N. V. +2 more
We present results of a study of the galactic open cluster population based on the all-sky catalogue ASCC-2.5 (I/280A) compiled from Tycho-2, Hipparcos and other catalogues. The sample of optical clusters from ASCC-2.5 is complete up to about 850 pc from the Sun. The symmetry plane of the clusters' distribution is determined to be at Z_0=-22±4 pc,…