Search Publications
The Centaur 10199 Chariklo: investigation into rotational period, absolute magnitude, and cometary activity
Fornasier, S.; Snodgrass, C.; Alvarez-Candal, A. +6 more
Context. Rings have recently been discovered around the Centaur 10199 Chariklo.
Aims: In this paper we present new photometric data, obtained at the 4.2 m SOAR Telescope, aiming to investigate Chariklo's absolute magnitude and rotational period, which is still unknown, and to look for potential cometary activity.
Methods: The field backg…
Eyes in the sky. Interactions between asymptotic giant branch star winds and the interstellar magnetic field
Decin, L.; Cox, N. L. J.; van Marle, A. J.
Context. The extended circumstellar envelopes (CSEs) of evolved low-mass stars display a large variety of morphologies. Understanding the various mechanisms that give rise to these extended structures is important to trace their mass-loss history.
Aims: Here, we aim to examine the role of the interstellar magnetic field in shaping the extende…
An active state of the BL Lacertae object Markarian 421 detected by INTEGRAL in April 2013
Maraschi, L.; Pian, E.; Villata, M. +22 more
Aims: Multiwavelength variability of blazars offers indirect, but very effective, insight into their powerful engines and on the mechanisms through which energy is propagated from the centre down the jet. The BL Lac object Mkn 421 is a TeV emitter, a bright blazar at all wavelengths, and therefore an excellent target for variability studies. …
X-ray observation of ULAS J1120+0641, the most distant quasar at z = 7.08
Salvaterra, R.; Moretti, A.; Vignali, C. +6 more
We probe the emission mechanism of the accreting super massive black holes in the high redshift Universe and, to do this, we study the X-ray spectrum of ULAS1120+064, the highest redshift quasar detected so far at z = 7.085, which has been deeply observed (340 ks) by XMM-Newton. Despite the long integration time, the spectral analysis is limited b…
Photospheric supergranular flows and magnetic flux emergence
Stangalini, M.
A recent study carried out on high-sensitivity SUNRISE/IMAX data has reported about areas of limited flux emergence in the quiet Sun. By exploiting an independent and longer (four hours) data set acquired by Hinode/SOT, we investigate these regions in more detail by analysing their spatial distribution and relation with the supergranular flow. Our…
Discovery of periodic dips in the light curve of GX 13+1: the X-ray orbital ephemeris of the source
Robba, N. R.; Di Salvo, T.; Burderi, L. +3 more
Context. The bright low-mass X-ray binary (LMXB) GX 13+1 is one of the most peculiar Galactic binary systems. A periodicity of 24.27 d was observed in its power spectrum density obtained from data collected over 14 years by the All Sky Monitor (ASM) on board the Rossi X-ray Timing Explorer (RXTE).
Aims: To determine the first X-ray orbital ep…
A search for pulsations in the HgMn star HD 45975 with CoRoT photometry and ground-based spectroscopy
Auvergne, M.; Fossati, L.; Poretti, E. +28 more
The existence of pulsations in HgMn stars is still being debated. To provide the first unambiguous observational detection of pulsations in this class of chemically peculiar objects, the bright star
On the relation between metallicity and RGB color in HST/ACS data
de Jong, R. S.; Goudfrooij, P.; Bailin, J. +3 more
Context. The determination of stellar metallicity and its gradient in external galaxies is a difficult task, but crucial for the understanding of galaxy formation and evolution.
Aims: The color of the Red Giant Branch (RGB) can be used to determine metallicities of stellar populations that have only shallow photometry. We will quantify the re…
Impact of particles on the Planck HFI detectors: Ground-based measurements and physical interpretation
Bock, J. J.; Catalano, A.; Coulais, A. +31 more
The Planck High Frequency Instrument (HFI) surveyed the sky continuously from August 2009 to January 2012. Its noise and sensitivity performance were excellent (from 11 to 40 aW Hz-1), but the rate of cosmic-ray impacts on the HFI detectors was unexpectedly higher than in other instruments. Furthermore, collisions of cosmic rays with th…
SN 2005at - A neglected type Ic supernova at 10 Mpc
Kankare, E.; Kotak, R.; Monard, L. A. G. +7 more
We present a photometric and spectroscopic study of a reddened type Ic supernova (SN) 2005at. We report our results based on the available data of SN 2005at, including late-time observations from the Spitzer Space Telescope and the Hubble Space Telescope. In particular, late-time mid-infrared observations are something rare for type Ib/c SNe. In o…