Search Publications
Distance determination for RAVE stars using stellar models. III. The nature of the RAVE survey and Milky Way chemistry
Gilmore, G.; Freeman, K. C.; Munari, U. +19 more
We apply the method of Burnett & Binney (2010, MNRAS, 407, 339) for the determination of stellar distances and parameters to the internal catalogue of the RAdial Velocity Experiment (RAVE; Steinmetz et al. 2006, AJ, 132, 1645). Subsamples of stars that either have Hipparcos parallaxes or belong to well-studied clusters inspire confidence in th…
Titan's obliquity as evidence of a subsurface ocean?
Karatekin, Ö.; Baland, R. -M.; van Hoolst, T. +1 more
On the basis of gravity and radar observations with the Cassini spacecraft, the moment of inertia of Titan and the orientation of Titan's rotation axis have been estimated in recent studies. According to the observed orientation, Titan is close to the Cassini state. However, the observed obliquity is inconsistent with the estimate of the moment of…
MHD wave transmission in the Sun's atmosphere
Berrilli, F.; Del Moro, D.; Stangalini, M. +1 more
Magnetohydrodynamics (MHD) wave propagation inside the Sun's atmosphere is closely related to the magnetic field topology. For example, magnetic fields are able to lower the cutoff frequency for acoustic waves, thus allowing the propagation of waves that would otherwise be trapped below the photosphere into the upper atmosphere. In addition, MHD w…
Ensemble X-ray variability of active galactic nuclei from serendipitous source catalogues
Trevese, D.; Vagnetti, F.; Turriziani, S.
Context. The X-ray variability of the active galactic nuclei (AGN) has been most often investigated with studies of individual, nearby sources, and only a few ensemble analyses have been applied to large samples in wide ranges of luminosity and redshift.
Aims: We aim to determine the ensemble variability properties of two serendipitously sele…
New insight into the formation of hexamethylenetetramine (HMT) in interstellar and cometary ice analogs
Vinogradoff, V.; Duvernay, F.; Danger, G. +2 more
Aims: We investigate the purely thermal formation of hexamethylenetetramine (HMT, C6H12N4) in interstellar ice analogs from non-photolysed ice and compare our results with those for the formation from photolysed ice.
Methods: We use Fourier transform-infrared spectroscopy to follow residue formation from …
The effect of environment on star forming galaxies at redshift. I. First insight from PACS
Berta, S.; Magnelli, B.; Nordon, R. +33 more
We use deep 70, 100 and 160 µm observations taken with PACS, the Photodetector Array Camera and Spectrometer on board of Herschel, as part of the PACS Evolutionary Probe (PEP) guaranteed time, to study the relation between star formation rate and environment at redshift ~ 1 in the GOODS-S and GOODS-N fields. We use the SDSS spectroscopic cat…
GOODS-Herschel: the impact of galaxy-galaxy interactions on the far-infrared properties of galaxies
Magnelli, B.; Altieri, B.; Aussel, H. +15 more
Aims: We study the impact of galaxy-galaxy interactions on the far-infrared properties of galaxies and its evolution at 0 < z < 1.2.
Methods: Using the high-z galaxies in the fields of Great Observatories Origins Deep Survey (GOODS) observed by the Herschel Space Observatory in the framework of the GOODS-Herschel key program and th…
Variable X-ray absorption in the mini-BAL QSO PG 1126-041
Cappi, M.; Ponti, G.; Vignali, C. +7 more
Context. X-ray studies of active galactic nuclei (AGN) with powerful nuclear winds are important for constraining the physics of the inner accretion/ejection flow around supermassive black holes (SMBHs) and for understanding the impact of such winds on the AGN environment.
Aims: Our main scientific goal is to constrain the properties of the c…
The 22 May 2007 B-class flare: new insights from Hinode observations
Mason, H. E.; Del Zanna, G.; Bradshaw, S. J. +2 more
We present multi-wavelength observations of a small B-class flare which occurred on the Sun on 2007 May 22. The observations include data from Hinode, GOES, TRACE and the Nobeyama Radioheliograph. We obtained spatially and spectrally-resolved information from the Hinode EUV Imaging Spectrometer (EIS) during this event. The temporal and temperature…
An optical/NIR survey of globular clusters in early-type galaxies. II. Ages of globular cluster systems and the relation to galaxy morphology
Larsen, S. S.; Kuntschner, H.; Anders, P. +5 more
Context. Some photometric studies of extragalactic globular cluster (GC) systems using the optical and near-infrared colour combination have suggested the presence of a large fraction of intermediate-age (2-8 Gyr) GCs.
Aims: We investigate the age distributions of GC systems in 14 E/S0 galaxies.
Methods: We carried out a differential com…