Search Publications
XMMSL2 J144605.0+685735: a slow tidal disruption event
Read, A. M.; Berger, E.; Komossa, S. +6 more
Aims: We investigate the evolution of X-ray selected tidal disruption events.
Methods: New events are found in near real-time data from XMM-Newton slews, and are monitored by multi-wavelength facilities.
Results: In August 2016, X-ray emission was detected from the galaxy XMMSL2 J144605.0+685735 (also known as 2MASX 14460522+6857311…
Velocity profiles of [CII], [CI], CO, and [OI] and physical conditions in four star-forming regions in the Large Magellanic Cloud
Hughes, Annie; Güsten, Rolf; Okada, Yoko +4 more
Aims: The aim of our study is to investigate the physical properties of the star-forming interstellar medium (ISM) in the Large Magellanic Cloud (LMC) by separating the origin of the emission lines spatially and spectrally. The LMC provides a unique local template to bridge studies in the Galaxy and high redshift galaxies because of its low m…
Multiplicity of Galactic Cepheids from long-baseline interferometry. IV. New detected companions from MIRC and PIONIER observations
Kervella, P.; Anderson, R. I.; Baron, F. +10 more
Aims: We aim at detecting and characterizing the main-sequence companions of a sample of known and suspected Galactic binary Cepheids. The long-term objective is to accurately and independently measure the Cepheid masses and distances.
Methods: We used the multi-telescope interferometric combiners CHARA/MIRC and VLTI/PIONIER to detect an…
Combining multiple structural inversions to constrain the solar modelling problem
Buldgen, G.; Eggenberger, P.; Meynet, G. +12 more
Context. The Sun is the most studied of all stars, which serves as a reference for all other observed stars in the Universe. Furthermore, it also serves the role of a privileged laboratory of fundamental physics and can help us better understand processes occuring in conditions irreproducible on Earth. However, our understanding of our star is cur…
Additional fluorine abundance determinations in evolved stars
de Laverny, P.; Cunha, K.; Abia, C. +2 more
We present new fluorine abundance measurements for a sample of carbon-rich asymptotic giant branch (AGB) stars and two other metal-poor evolved stars of Ba/CH types. The abundances are derived from IR, K-band, high-resolution spectra obtained using GEMINI-S/Phoenix and TNG/Giano-b. Our sample includes an extragalactic AGB carbon star belonging to …
The B-Star Exoplanet Abundance Study: a co-moving 16-25 MJup companion to the young binary system HIP 79098
Reffert, Sabine; Langlois, Maud; Delorme, Philippe +13 more
Wide low-mass substellar companions are known to be very rare among low-mass stars, but appear to become increasingly common with increasing stellar mass. However, B-type stars, which are the most massive stars within 150 pc of the Sun, have not yet been examined to the same extent as AFGKM-type stars in that regard. In order to address this issue…
Dust emission profiles of DustPedia galaxies
Bianchi, S.; Fritz, J.; Madden, S. C. +19 more
Most radiative transfer models assume that dust in spiral galaxies is distributed exponentially. In this paper our goal is to verify this assumption by analysing the two-dimensional large-scale distribution of dust in galaxies from the DustPedia sample. For this purpose, we have made use of Herschel imaging in five bands, from 100 to 500 µm,…
Evolving optical polarisation of the black hole X-ray binary MAXI J1820+070
Piirola, Vilppu; Tsygankov, Sergey S.; Poutanen, Juri +8 more
Aims: The optical emission of black hole transients increases by several magnitudes during the X-ray outbursts. Whether the extra light arises from the X-ray heated outer disc, from the inner hot accretion flow, or from the jet is currently debated. Optical polarisation measurements are able to distinguish the relative contributions of these …
A joint XMM-NuSTAR observation of the galaxy cluster Abell 523: Constraints on inverse Compton emission
Brunetti, G.; Rossetti, M.; Wik, D. R. +17 more
Aims: We present the results of a joint XMM-Newton and NuSTAR observation (200 ks) of the galaxy cluster Abell 523 at z = 0.104. The peculiar morphology of the cluster radio halo and its outlier position in the radio power P(1.4 GHz) - X-ray luminosity plane make it an ideal candidate for the study of radio and X-ray correlations and for the …
CHANG-ES. XIX. Galaxy NGC 4013: a diffusion-dominated radio halo with plane-parallel disk and vertical halo magnetic fields
Weżgowiec, M.; Dettmar, R. -J.; Beck, R. +9 more
Context. The radio continuum halos of edge-on spiral galaxies have diverse morphologies, with different magnetic field properties and cosmic ray (CR) transport processes into the halo.
Aims: Using the Continuum HAloes in Nearby Galaxies - an EVLA Survey (CHANG-ES) radio continuum data from the Karl G. Jansky Very Large Array (VLA) in two freq…