Search Publications
ALMA-backed NIR high resolution integral field spectroscopy of the NUGA galaxy NGC 1433
Eckart, Andreas; García-Marín, Macarena; Combes, Françoise +7 more
Aims: We present the results of near-infrared (NIR) H- and K-band European Southern Observatory SINFONI integral field spectroscopy (IFS) of the Seyfert 2 galaxy
GW Orionis: Inner disk readjustments in a triple system
Eiroa, C.; Fedele, D.; Henning, Th. +4 more
Context. Disks are expected to dissipate quickly in binary or multiple systems. Investigating such systems can improve our knowledge of the disk dispersal. The triple system GW Ori, still harboring a massive disk, is an excellent target.
Aims: We study the young stellar system GW Ori, concentrating on its accretion, wind activity and disk pro…
A new sample of X-ray selected narrow emission-line galaxies. I. The nature of optically elusive AGN
Watson, M. G.; Pons, E.
Using the 3XMM catalogue of serendipitous X-ray sources, and the SDSS-DR9 spectroscopic catalogue, we have obtained a new sample of X-ray selected narrow emission line galaxies. The standard optical diagnostic diagram and selection by hard X-ray luminosity expose a mismatch between the optically-based and X-ray-based classifications. The nature of…
Multiwavelength campaign on Mrk 509. XIII. Testing ionized-reflection models on Mrk 509
Kaastra, J. S.; Kriss, G. A.; Arav, N. +12 more
Active galactic nuclei (AGN) are the most luminous persistent objects in the universe. The X-ray domain is particularly important because the X-ray flux represents a significant fraction of the bolometric emission from such objects and probes the innermost regions of accretion disks, where most of this power is generated. An excess of X-ray emissi…
Soft X-ray characterisation of the long-term properties of supergiant fast X-ray transients
Esposito, P.; Ducci, L.; Romano, P. +3 more
Context. Supergiant fast X-ray transients (SFXTs) are high mass X-ray binaries (HMXBs) that are characterised by a hard X-ray (≥ 15 keV) flaring behaviour. These flares reach peak luminosities of 1036-1037 erg s-1 and last a few hours in the hard X-rays.
Aims: We investigate the long-term properties of SFXTs b…
The detached dust shells around the carbon AGB stars R Sculptoris and V644 Scorpii
Olofsson, G.; Maercker, M.; Leal-Ferreira, M. L. +2 more
Context. The morphology of the circumstellar envelopes (CSE) around asymptotic giant branch (AGB) stars gives information on the mass-loss process from the star, its evolution and wind, and on the effect of binary interaction. However, determining the distribution of dust in the circumstellar envelopes is difficult. Observations of polarised, dust…
Scaling relations of cluster elliptical galaxies at z~ 1.3. Distinguishing luminosity and structural evolution
Poggianti, B. M.; Boutsia, K.; Fumana, M. +10 more
Context. We studied the size-surface brightness and the size-mass relations of a sample of 16 cluster elliptical galaxies in the mass range ~ 1010-2 × 1011 M⊙, which were morphologically selected in the cluster RDCS J0848+4453 at z = 1.27.
Aims: Our aim is to assess whether they have completed their mass growt…
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. …