Search Publications
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…
On the relationship of shock waves to flares and coronal mass ejections
Hillaris, A.; Preka-Papadema, P.; Nindos, A. +1 more
Context. Metric type II bursts are the most direct diagnostic of shock waves in the solar corona.
Aims: There are two main competing views about the origin of coronal shocks: that they originate in either blast waves ignited by the pressure pulse of a flare or piston-driven shocks due to coronal mass ejections (CMEs). We studied three well-ob…
VLT-VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies. III. The atlas of the stellar and ionized gas distribution
Colina, L.; Monreal-Ibero, A.; Arribas, S. +3 more
Context. Luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) are much more numerous at higher redshifts than locally, dominating the star-formation rate density at redshifts ~1-2. Therefore, they are important objects in order to understand how galaxies form and evolve through cosmic time. Local samples provide a unique opportunity to …
The hard X-ray emission of Centaurus A
Terrier, R.; Jean, P.; Beckmann, V. +2 more
Context. The radio galaxy Cen A has been detected all the way up to the TeV energy range. This raises the question about the dominant emission mechanisms in the high-energy domain.
Aims: Spectral analysis allows us to put constraints on the possible emission processes. Here we study the hard X-ray emission, in order to distinguish between a t…
Witnessing the magnetospheric boundary at work in Vela X-1
Santangelo, A.; Doroshenko, V.; Suleimanov, V.
We present an analysis of the Vela X-1 "off-states" based on Suzaku observations taken in June 2008. Defined as states in which the flux suddenly decreases below the instrumental sensitivity, these "off-states" have been interpreted by several authors as the onset of the "propeller regime". For the first time ever, however, we find that the source…
Asymmetries of the Stokes V profiles observed by HINODE SOT/SP in the quiet Sun
Sánchez Almeida, J.; Viticchié, B.
Aims: A recent analysis of polarization measurements of HINODE SOT/SP in the quiet Sun pointed out very complex shapes of Stokes V profiles. Here we present the first classification of the SOT/SP circular polarization measurements with the aim of highlighting exhaustively the whole variety of Stokes V shapes emerging from the quiet Sun.
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A new comprehensive 2D model of the point spread functions of the XMM-Newton EPIC telescopes: spurious source suppression and improved positional accuracy
Read, A. M.; Saxton, R. D.; Rosen, S. R. +1 more
Aims: We describe here a new full 2D parameterization of the PSFs of the three XMM-Newton EPIC telescopes as a function of instrument, energy, off-axis angle and azimuthal angle, covering the whole field-of-view (FoV) of the three EPIC detectors. It models the general PSF envelopes, the primary and secondary spokes, their radial dependencies,…