Search Publications
X-ray properties in massive galaxy clusters: XMM-Newton observations of the REFLEX-DXL sample
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +5 more
We selected an unbiased, flux-limited and almost volume-complete sample of 13 distant, X-ray luminous (DXL, z∼ 0.3) clusters and one supplementary cluster at z=0.2578 from the REFLEX Survey (the REFLEX-DXL sample). We performed a detailed study to explore their X-ray properties using XMM-Newton observations. Based on the precise radial distributio…
The host galaxy/AGN connection in nearby early-type galaxies. Is there a miniature radio-galaxy in every "core" galaxy?
Capetti, A.; Balmaverde, B.
This is the second of a series of three papers exploring the connection between the multiwavelength properties of AGN in nearby early-type galaxies and the characteristics of their hosts. We selected two samples with 5 GHz VLA radio flux measurements down to 1 mJy, reaching levels of radio luminosity as low as 1036 erg s-1. I…
An updated survey of globular clusters in M 31. I. Classification and radial velocity for 76 candidate clusters
Bellazzini, M.; Galleti, S.; Federici, L. +2 more
Aims.We present the first results of a large spectroscopic survey of globular clusters and candidate globular clusters in the nearby M 31 galaxy. The survey is aimed at the classification of known candidate M 31 clusters and at the study of their kinematic properties.
Methods: .We obtained low-resolution spectroscopy (λ/Δλ ≃ 800-1300) for 133 …
Cosmic evolution of the galaxy's mass and luminosity functions by morphological type from multi-wavelength data in the CDF-South
Berta, S.; Rodighiero, G.; Hatziminaoglou, E. +7 more
Aims.We constrain the evolution of the galaxy mass and luminosity functions from the analysis of (public) multi-wavelength data in the Chandra Deep Field South (CDFS) area, obtained from GOODS and other projects, including very deep high-resolution imaging by HST/ACS.
Methods.Our reference catalogue of faint high-redshift galaxies, which we hav…
Evolution of magnetic fields and energetics of flares in active region 8210
Régnier, S.; Canfield, R. C.
To better understand eruptive events in the solar corona, we combine sequences of multi-wavelength observations and modelling of the coronal magnetic field of NOAA AR 8210, a highly flare-productive active region. From the photosphere to the corona, the observations give us information about the motion of magnetic elements (photospheric magnetogra…
Average hard X-ray emission from NS LMXBs: observational evidence of different spectral states in NS LMXBs
Titarchuk, L.; Frontera, F.; Goldoni, P. +9 more
Aims.We studied and compared the long-term average hard X-ray (>20 keV) spectra of a sample of twelve bright low-mass X-ray binaries hosting a neutron star (NS). Our sample comprises the six well studied Galactic Z sources and six Atoll sources, four of which are bright (“GX”) bulge sources while two are weaker ones in the 2-10 keV range (H 175…
Young star cluster complexes in NGC 4038/39. Integral field spectroscopy using VIMOS-VLT
Bastian, N.; Maraston, C.; Kissler-Patig, M. +1 more
We present the first results of a survey to obtain Integral Field Spectroscopy of merging galaxies along the Toomre Sequence. In the present work, we concentrate on the star cluster complexes in the Antennae galaxies (NGC 4038/39) in the overlap region as well as the nuclear region of NGC 4038. Using optical spectroscopy we derive the extinction, …
Infrared photometry and evolution of mass-losing AGB stars. I. Carbon stars revisited
Ciprini, S.; Guandalini, R.; Busso, M. +2 more
As part of a reanalysis of galactic Asymptotic Giant Branch (AGB) stars at infrared (IR) wavelengths, we discuss a sample (357) of carbon stars for which mass loss rates, near-IR photometry and distance estimates exist. For 252 sources we collected mid-IR fluxes from the MSX (6C) and the ISO-SWS catalogues. Most stars have spectral energy distribu…
uvby-β photometry of high-velocity and metal-poor stars. XI. Ages of halo and old disk stars
Moitinho, A.; Schuster, W. J.; Parrao, L. +2 more
New uvby-β data are provided for 442 high-velocity and metal-poor stars; 90 of these stars have been observed previously by us, and 352 are new. When combined with our previous two photometric catalogues, the data base is now made up of 1533 high-velocity and metal-poor stars, all with uvby-β photometry and complete kinematic data, such as proper …
Constraining the population of 6 ⪉ {z} ⪉ 10 star-forming galaxies with deep near-IR images of lensing clusters
Kneib, J. -P.; Schaerer, D.; Pelló, R. +2 more
We present the first results of our deep survey of lensing clusters aimed at constraining the abundance of star-forming galaxies at z∼6-10, using lensing magnification to improve the search efficiency and subsequent spectroscopic studies. Deep near-IR photometry of two lensing clusters (A1835 and AC114) was obtained with ISAAC/VLT. These images, c…