Search Publications
The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster ω Centauri
Lewis, Geraint F.; Ting, Yuan-Sen; Buder, Sven +17 more
Using kinematics from Gaia and the large elemental abundance space of the second data release of the GALAH survey, we identify two new members of the Fimbulthul stellar stream, and chemically tag them to massive, multimetallic globular cluster ω Centauri. Recent analysis of the second data release of Gaia had revealed the Fimbulthul stellar stream…
A search for star clusters in the outskirts of the Large Magellanic Cloud: indication of clusters in the age gap
Cignoni, M.; Tosi, M.; Ripepi, V. +7 more
The YMCA (Yes, Magellanic Clouds Again) and STEP (The SMC in Time: Evolution of a Prototype interacting late-type dwarf galaxy) projects are deep g, i photometric surveys carried out with the VLT Survey Telescope (VST) and devoted to study the outskirts of the Magellanic System. A main goal of YMCA and STEP is to identify candidate stellar cluster…
Clusterix 2.0: a virtual observatory tool to estimate cluster membership probability
Jordi, C.; Balaguer-Núñez, L.; Masana, E. +6 more
Clusterix 2.0 is a web-based, Virtual Observatory compliant, interactive tool for the determination of membership probabilities in stellar clusters based on proper-motion data using a fully non-parametric method. In an area occupied by a cluster, the frequency function is made up of two contributions: cluster and field stars. The tool performs an …
New insight into the origin of the GeV flare in the binary system PSR B1259-63/LS 2883 from the 2017 periastron passage
van Soelen, B.; Murphy, D.; Chernyakova, M. +4 more
PSR B1259-63 is a gamma-ray binary system hosting a radio pulsar orbiting around an O9.5Ve star, LS 2883, with a period of ∼3.4 yr. The interaction of the pulsar wind with the LS 2883 outflow leads to unpulsed broad-band emission in the radio, X-rays, GeV, and TeV domains. While the radio, X-ray, and TeV light curves show rather similar behaviour,…
Rings and arcs around evolved stars - II. The Carbon Star AFGL 3068 and the Planetary Nebulae NGC 6543, NGC 7009, and NGC 7027
Balick, B.; Guerrero, M. A.; Toalá, J. A. +2 more
We present a detailed comparative study of the arcs and fragmented ring-like features in the haloes of the planetary nebulae (PNe) NGC 6543, NGC 7009, and NGC 7027 and the spiral pattern around the carbon star AFGL 3068 using high-quality multi-epoch HST images. This comparison allows us to investigate the connection and possible evolution between…
Models of distorted and evolving dark matter haloes
Erkal, Denis; Vasiliev, Eugene; Evans, N. Wyn +2 more
We investigate the ability of basis function expansions to reproduce the evolution of a Milky Way-like dark matter halo, extracted from a cosmological zoom-in simulation. For each snapshot, the density of the halo is reduced to a basis function expansion, with interpolation used to recreate the evolution between snapshots. The angular variation of…
hybrid-LENSTOOL: a self-consistent algorithm to model galaxy clusters with strong- and weak-lensing simultaneously
Richard, Johan; Kneib, Jean-Paul; Sharon, Keren +5 more
We present a new galaxy cluster lens modelling approach, hybrid-LENSTOOL, that is implemented in the publicly available modelling software LENSTOOL. hybrid-LENSTOOL combines a parametric approach to model the core of the cluster, and a non-parametric (free-form) approach to model the outskirts. hybrid-LENSTOOL optimizes both strong- and weak-lensi…
The case for strangulation in low-mass hosts: DDO 113
Kochanek, Christopher S.; Sand, David J.; Peter, Annika H. G. +2 more
We investigate the case for environmental quenching of the Fornax-mass satellite DDO 113, which lies only 9 kpc in projection from its host, the Large-Magellanic-Cloud-mass galaxy NGC 4214. DDO 113 was quenched about 1 Gyr ago and is virtually gas-free, while analogs in the field are predominantly star-forming and gas-rich. We use deep imaging obt…
S2COSMOS: Evolution of gas mass with redshift using dust emission
Małek, K.; Ao, Y.; Ho, L. C. +15 more
We investigate the evolution of the gas mass fraction for galaxies in the COSMOS field using submillimetre emission from dust at 850 µm. We use stacking methodologies on the 850 µm S2COSMOS map to derive the gas mass fraction of galaxies out to high redshifts, 0 ≤ z ≤ 5, for galaxies with stellar masses of 109.5 < M*…
Spectral characterization of the non-thermal X-ray emission of gamma-ray pulsars
Coti Zelati, Francesco; Torres, Diego F.; Li, Jian +1 more
We report on a detailed spectral characterization of the non-thermal X-ray emission for a large sample of gamma-ray pulsars in the second Fermi Large Area Telescope catalogue. We outline the criteria adopted for the selection of our sample, its completeness, and critically describe different approaches to estimate the spectral shape and flux of pu…