Search Publications
Chemodynamics of metal-poor wide binaries in the Galactic halo: Association with the Sequoia event
Hansen, Camilla Juul; Peñarrubia, Jorge; Lépine, Sebastien +4 more
Recently, an increasing number of wide binaries has been discovered. Their chemical and dynamical properties are studied through extensive surveys and pointed observations. However, the formation of these wide binaries is far from clear, although several scenarios have been suggested. In order to investigate the chemical compositions of these syst…
The origin of X-ray emission in 3CRR sources: Hints from mid-infrared Spitzer observations
Li, Shuang-Liang; Gu, Minfeng
Aims: Whether X-ray emission in radio-loud (RL) active galactic nuclei (AGNs) originates from disk coronae or jets is still under debate. For example, the positive relationships in radio-quiet AGNs (such as the optical to X-ray spectral index αOX and Eddington ration λO as well as the X-ray photon index Γ and λO
Gamma-ray bursts as probes of high-redshift Lyman-α emitters and radiative transfer models
Salvaterra, R.; Milvang-Jensen, B.; Fynbo, J. P. U. +7 more
Aims: We present the updated census and statistics of Lyman-α emitting long gamma-ray burst host galaxies (LAE-LGRBs). We investigate the properties of a subsample of LAE-LGRBs and test the shell model that is commonly used to fit Lyman-α (Lyα) emission line spectra.
Methods: We considered all LGRB host galaxies with relevant publicly av…
The OTELO survey. Revealing a population of low-luminosity active star-forming galaxies at z ∼ 0.9
Barrufet, Laia; Gallego, Jesús; Sánchez-Portal, Miguel +16 more
Aims: We study a sample of Hβ emission line sources at z ∼ 0.9 to identify the star-forming galaxies sample and characterise them in terms of line luminosity, stellar mass, star formation rate, and morphology. The final aim is to obtain the Hβ luminosity function of the star-forming galaxies at this redshift.
Methods: We used the red tun…
Morphological study of the nested planetary nebula Hubble 12
Zhang, Yong; Sadjadi, SeyedAbdolreza; Hsia, Chih-Hao +3 more
We present a visible-infrared imaging study of young planetary nebula (PN) Hubble 12 (Hb 12; PN G111.8-02.8) obtained with Hubble Space Telescope (HST) archival data and our own Canada-France-Hawaii Telescope (CFHT) measurements. Deep HST and CFHT observations of this nebula reveal three pairs of bipolar structures and an arc-shaped filament near …
Curiouser and curiouser: the peculiar chemical composition of the Li- and Na-rich star in ω Centauri
Salaris, M.; Bonifacio, P.; Momany, Y. +5 more
We present a multi-instrument spectroscopic analysis of the unique Li- and Na-rich giant star #25664 in ω Centauri, using spectra acquired with FLAMES-GIRAFFE, X-shooter, UVES, and HARPS. Li and Na abundances have been derived from the UVES spectrum using transitions weakly sensitive to non-local thermodynamic equilibrium and assumed isotopic rati…
High-cadence measurements of electron pitch-angle distributions from Solar Orbiter SWA-EAS burst mode operations
Lewis, G. R.; Kataria, D. O.; Livi, S. +17 more
Small-scale kinetic processes associated with turbulence, plasma instabilities, magnetic reconnection, etc., play a major role in dissipating energy and governing the large-scale evolution of the solar wind. However, a general impediment to improving the understanding of the kinetic physics of the solar wind is in the limitations on measurement ca…
Physical characterization of S169: a prototypical IR bubble associated with the massive star-forming region IRAS 12326-6245
Reynoso, E. M.; Cichowolski, S.; Bronfman, L. +5 more
Aims: With the aim of studying the physical properties of Galactic IR bubbles and to explore their impact in massive star formation, we present a study of the IR bubble S169, associated with the massive star forming region IRAS 12326-6245.
Methods: We used CO (2-1),13CO (2-1), C18O (2-1), HCN (3-2), and HCO+
Bayesian decomposition of the Galactic multi-frequency sky using probabilistic autoencoders
Enßlin, Torsten A.; Frank, Philipp; Müller, Ancla +2 more
Context. All-sky observations show both Galactic and non-Galactic diffuse emission, for example from interstellar matter or the cosmic microwave background (CMB). The decomposition of the emission into different underlying radiative components is an important signal reconstruction problem.
Aims: We aim to reconstruct radiative all-sky compone…
Debris discs in binaries: morphology and photometric signatures
Kral, Q.; Olofsson, J.; Thebault, P.
Context. Since about half of all main-sequence stars reside in multiple star systems, it is important to consider the effect of binarity on the evolution of planetesimal belts in these complex systems.
Aims: We aim to see whether debris belts evolving between two stars may be impacted by the presence of the companion and whether this leaves a…