Search Publications
The role of ultraviolet imaging in studies of resolved and unresolved young stellar populations. M31 and M33
Bianchi, Luciana; Hodge, Paul; Williams, Benjamin +2 more
We discuss the relevance of UV data in the detection and characterization of hot massive stars and young stellar populations in galaxies. We show results from recent extensive surveys in M31 and M33 with Hubble Space Telescope (HST) multi-wavelength data including UV filters, which imaged several regions at a linear resolution (projected) of less …
IGR J17488-2338: a newly discovered giant radio galaxy
Venturi, T.; Bird, A. J.; Ubertini, P. +4 more
We present the discovery of a large-scale radio structure associated with IGR J17488-2338, a source recently discovered by INTEGRAL and optically identified as a broad-line AGN at redshift 0.24. At low frequencies, the source properties are those of an intermediate-power FR II radio galaxy with a linear size of 1.4 Mpc. This new active galaxy is t…
Imaging the Environment of a z = 6.3 Submillimeter Galaxy with SCUBA-2
Pérez-Fournon, I.; Ivison, R. J.; Omont, A. +24 more
We describe a search for submillimeter emission in the vicinity of one of the most distant, luminous galaxies known, HerMES FLS3, at z = 6.34, exploiting it as a signpost to a potentially biased region of the early universe, as might be expected in hierarchical structure formation models. Imaging to the confusion limit with the innovative, wide-fi…
The 2.35 year itch of Cygnus OB2 #9. III. X-ray and radio emission analysis based on 3D hydrodynamical modelling
Blomme, R.; Nazé, Y.; Pittard, J. M. +1 more
Context. The wind-wind collision in a massive star binary system leads to the generation of high temperature shocks that emit at X-ray wavelengths and, if particle acceleration is effective, may exhibit non-thermal radio emission. Cyg OB2#9 is one of a small number of massive star binary systems in this class.
Aims: X-ray and radio data recen…
The ionized nebula surrounding the red supergiant W26 in Westerlund 1
Drake, Jeremy J.; Barlow, Michael J.; Wright, Nicholas J. +7 more
We present Hα images of an ionized nebula surrounding the M2-5Ia red supergiant (RSG) W26 in the massive star cluster Westerlund 1. The nebula consists of a circumstellar shell or ring ∼0.1 pc in diameter and a triangular nebula ∼0.2 pc from the star that in high-resolution Hubble Space Telescope images shows a complex filamentary structure. The e…
A Tale of a Rich Cluster at z ~ 0.8 as Seen by the Star Formation Histories of its Early-type Galaxies
Vazdekis, Alexandre; Sánchez-Blázquez, Patricia; Ferré-Mateu, Anna +1 more
We present a detailed stellar population analysis for a sample of 24 early-type galaxies (ETGs) belonging to the rich cluster RX J0152.7-1357 at z = 0.83. We have derived the age, metallicity, abundance pattern, and star formation history (SFH) for each galaxy individually to further characterize this intermediate-z reference cluster. We then stud…
Possible observation of charged nanodust from comet 67P/Churyumov-Gerasimenko: An analysis for the ROSETTA mission
Szego, K.; Bebesi, Z.; Juhasz, A.
Nanodust particles are ubiquitous in the solar system; we may expect that comet 67P/Churyumov-Gerasimenko, the target of the upcoming ROSETTA mission, is also a source of nanodust, that is dust particles of nanometer size. Due to their small size and mass, the dust detectors cannot observe them directly neither on the orbiter nor on the Philae lan…
GALFIT-CORSAIR: Implementing the Core-Sérsic Model Into GALFIT
Bonfini, Paolo
We introduce GALFIT-CORSAIR: a publicly available, fully retro-compatible modification of the 2D fitting software GALFIT (v.3) which adds an implementation of the core-Sersic model. We demonstrate the software by fitting the images of NGC 5557 and NGC 5813, which have been previously identified as core-Sersic galaxies by their 1D radial light prof…
New light on the multiple jets of CRL 618
Velázquez, P. F.; Raga, A. C.; Riera, A. +2 more
Context. Proto-planetary nebulae (pPNe) are thought to represent the transitory phase of the late stages of low- to intermediate-mass stars. Most pPNe show a bipolar or multipolar geometry. The process(es) that transforms the spherical asymptotic giant branch (AGB) ejecta into a bipolar/multipolar geometry is not known in detail. Interactions betw…
Ion energization and transport associated with magnetic dipolarizations
El-Alaoui, Mostafa; Walker, Raymond J.; Ashour-Abdalla, Maha +1 more
Ion energization in the magnetotail during substorms is examined by simulating a modest substorm event that occurred on 7 February 2009. The simulation scheme combines global magnetohydrodynamic (MHD) modeling of the magnetosphere driven by realistic upstream solar wind conditions, with a large-scale kinetics (LSK) simulation. Multiple earthward p…