Search Publications
An O2 If*/WN6 star caught in the act in a compact H II region in the starburst cluster NGC 3603
Roman-Lopes, A.
In this paper, we report on the discovery of an O2 If*/WN6 star probably still partially embedded in its parental cocoon in the starburst cluster NGC 3603. From the observed size of the associated compact H II region, it has been possible to derive a probable dynamic age of no more than 600 000 yr. Using the computed visual extinction value A…
Large-scale anomalies of the CMB in the curvaton scenario
Liu, Hao; Naselsky, Pavel; Frejsel, Anne Mette
We extend the curvaton scenario presented by Erickcek et al. [1,2], to explain how the even-odd multipole asymmetry of the Cosmic Microwave Background (CMB) (also called parity asymmetry, [3,4]) and power anisotropies can be generated by the curvaton field, which acts as an extra component to the spectrum of adiabatic perturbations in the inflatio…
Reflection-dominated Nuclear X-Ray Emission in the Early-type Galaxy ESO 565-G019
Alexander, D. M.; Done, C.; Takahashi, T. +8 more
We present the discovery of a reflection-dominated active galactic nucleus (AGN) in the early-type radio-quiet galaxy ESO 565-G019 with Suzaku and Swift/Burst Alert Telescope. The source X-ray spectrum below 10 keV is characteristic of other Compton-thick (CT) AGNs, clearly showing an inverted continuum and prodigious fluorescence iron emission ab…
Orbital motion of the binary brown dwarf companions HD 130948 BC around their host star
Neuhäuser, R.; Schmidt, T. O. B.; Ginski, C. +2 more
Evolutionary models and mass estimates for brown dwarfs remain uncertain, hence determining the masses of brown dwarfs by model-independent methods is important to test and constrain such theories. Following the orbital motion of brown dwarf companions around their primaries gives us the opportunity to dynamically calculate the masses of these sys…
Transiting exoplanets from the CoRoT space mission. XXIV. CoRoT-25b and CoRoT-26b: two low-density giant planets
Mazeh, T.; Aigrain, S.; Alonso, R. +47 more
We report the discovery of two transiting exoplanets, CoRoT-25b and CoRoT-26b, both of low density, one of which is in the Saturn mass-regime. For each star, ground-based complementary observations through optical photometry and radial velocity measurements secured the planetary nature of the transiting body and allowed us to fully characterize th…
The Herschel Virgo Cluster Survey - XIV. Transition-type dwarf galaxies in the Virgo cluster
Zibetti, Stefano; De Looze, Ilse; Baes, Maarten +19 more
We use dust scaling relations to investigate the hypothesis that Virgo cluster transition-type dwarfs are infalling star-forming field galaxies, which is argued based on their optical features (e.g. discs, spiral arms and bars) and kinematic properties similar to late-type galaxies. After their infall, environmental effects gradually transform the…
Proper motions of young stars in Chamaeleon. II. New kinematical candidate members of Chamaeleon I and II
Bouy, Hervé; Barrado, David; Bayo, Amelia +4 more
Context. The Chamaeleon star-forming region has been extensively studied in the last decades. However, most studies have been confined to the densest parts of the clouds. In a previous paper, we analysed the kinematical properties of the spectroscopically confirmed population of the Chamaeleon I and II clouds.
Aims: We want to search for new …
Nature of the gas and dust around 51 Ophiuchi. Modelling continuum and Herschel line observations
Pinte, C.; Ménard, F.; Woitke, P. +11 more
Context. Circumstellar disc evolution is paramount for the understanding of planet formation. The gas in protoplanetary discs large program (GASPS) aims at determining the circumstellar gas and solid mass around ~250 pre-main-sequence Herbig Ae and T Tauri stars.
Aims: We aim to understand the origin and nature of the circumstellar matter orb…
The INTEGRAL Source IGR J16328-4726: A High-mass X-Ray Binary from the BeppoSAX Era
Piro, L.; Bird, A. J.; Fiocchi, M. +5 more
We report on temporal and spectral analysis of the INTEGRAL fast transient candidate IGR J16328-4726 observed with BeppoSAX in 1998 and more recently with INTEGRAL. The MECS X-ray data show a frequent microactivity typical of the intermediate state of supergiant fast X-ray transients and a weak flare with a duration of ~4.6 ks. The X-ray emission …
Can spicules be detected at disc centre in broad-band Ca ii H filter imaging data?
Rezaei, R.; Puschmann, K. G.; Beck, C.
Context. Recently, a possible identification of type II spicules in broad-band (full-width at half-maximum (FWHM) of ~0.3 nm) filter imaging data in Ca ii H on the solar disc was reported.
Aims: We estimate the formation height range contributing to broad-band and narrow-band filter imaging data in Ca ii H to investigate whether spicules can …